How do scientist determine bond angles and bond lengths in chemical compunds?

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• How do scientist determine bond angles and bond lengths in chemical compunds?
• Does aphantasia affect people's ability to dream?
• How do engineers of extremely powerful rocket engines, like the F-1, keep the thrust from crushing the engine itself?
• Why are Horn Africans generally referred to as West Eurasian migrants to the region when it's believed to be the home of anatomically modern Homo sapiens?
• What is Gödel’s incompleteness theorem and why is it important? How did it change math/physics ?
• How uranium is replaced in the core once its entirely consumed?
• Birds of prey are infamous for their keen eyesight, but does this make their eyes more sensitive to light? Would looking at the sun be tougher for them than it is for humans? If so, do some birds of prey have an easier time with light than others?
• A lot of sources online say that we’ve only discovered about 14 to 15% of over 8 million species on earth. I don’t understand how we know that there are 6.5 MM+ undiscovered species if we haven’t discovered them yet. how do we know what we don’t know?
• When a psychotic hears voices in their heads, why is it always something like the neighbor's dog telling them to kill, not to plant a nice rose garden? Is it simply because the people who do plant rose gardens don't make the news, or is psychosis inherently violent?
• Is there a consensus on the mechanism behind long runout landslides?
• How does Bluetooth work, and why is it that only two devices can be connected at any given time?
• How do migratory habits develop in animals?
• How does Molasses get nutrition when brown sugar has no nutrition? What happens in the manufacturing process to give the minerals its known for?
• Why do we need to vaccinate children? Why don’t children inherit those helpful antibodies from their inoculated mothers?
• How does torpor differ from sleep?
• What are the effects of hormones and antibiotics in our food that are used today?
• Why does wet grass get attached to your shoes when you run on it? What effect does water have on grass that makes it do this?
• If there are diseases we can get from animals, that are harmless to them, are there disesases that we can unconciously give to animals?
• Was there confirmed behaviours of animals washing themselves with certain substances to improve their body hygiene just like humans uses soup and the equivalent?
• Do animal fathers know their the father?
• Why is a noble configuration of electrons more stable than having a neutral charge for an atom?
• Is there any difference on heart rate (how hard the heart pump) based on wether I'm sitting, or standing still or any other pose?

How do scientist determine bond angles and bond lengths in chemical compunds? Posted: 22 Nov 2018 11:49 PM PST submitted by /u/Pika_chuuu_ [link] [comments]

Does aphantasia affect people's ability to dream? Posted: 22 Nov 2018 07:42 PM PST I've heard of a condition called aphantasia where in people have an extremely hard time visualizing objects in their mind or as some people say they have no "mind's eye." Is the visualization used in this instance the same that occurs during REM sleep? If they are not the same, does aphantasia affect people's ability to dream? submitted by /u/oxyppgyn [link] [comments]

How do engineers of extremely powerful rocket engines, like the F-1, keep the thrust from crushing the engine itself? Posted: 23 Nov 2018 06:58 AM PST submitted by /u/TheMavic [link] [comments]

Why are Horn Africans generally referred to as West Eurasian migrants to the region when it's believed to be the home of anatomically modern Homo sapiens? Posted: 23 Nov 2018 06:46 AM PST How are scientists(generally) so sure that their Caucasoid or Ethiopid if you will appearance and genetical markers such as various haplogroups and autosomal components are not an indigenous evolution respective to the ancestral population of the area then spread via the Sinai and the Bab-el-Mandeb to Eurasia? submitted by /u/degoobster [link] [comments]

What is Gödel’s incompleteness theorem and why is it important? How did it change math/physics ? Posted: 22 Nov 2018 04:49 PM PST submitted by /u/Vanzini- [link] [comments]

How uranium is replaced in the core once its entirely consumed? Posted: 22 Nov 2018 11:32 PM PST Presently, we are studying how a nuclear plant works, and i was wondering how the uranium was replaced once its consumed, how often does it happens? how do they do? submitted by /u/TheCakelsALie [link] [comments]

Birds of prey are infamous for their keen eyesight, but does this make their eyes more sensitive to light? Would looking at the sun be tougher for them than it is for humans? If so, do some birds of prey have an easier time with light than others? Posted: 23 Nov 2018 01:57 AM PST submitted by /u/ZephixVI [link] [comments]

A lot of sources online say that we’ve only discovered about 14 to 15% of over 8 million species on earth. I don’t understand how we know that there are 6.5 MM+ undiscovered species if we haven’t discovered them yet. how do we know what we don’t know? Posted: 22 Nov 2018 08:29 AM PST submitted by /u/PoontanghisKahn [link] [comments]

When a psychotic hears voices in their heads, why is it always something like the neighbor's dog telling them to kill, not to plant a nice rose garden? Is it simply because the people who do plant rose gardens don't make the news, or is psychosis inherently violent? Posted: 22 Nov 2018 08:51 PM PST submitted by /u/RussellZoloft [link] [comments]

Is there a consensus on the mechanism behind long runout landslides? Posted: 23 Nov 2018 07:06 AM PST submitted by /u/Dios5 [link] [comments]

How does Bluetooth work, and why is it that only two devices can be connected at any given time? Posted: 22 Nov 2018 10:12 PM PST To further elaborate on the second half, why can't I have Bluetooth send audio to both a headset and speakers, or multiple speakers in different locations? I understand why you can't have multiple "sending" devices trying to play sound, but why is the restriction on a single output device present? submitted by /u/AnonQnA [link] [comments]

How do migratory habits develop in animals? Posted: 23 Nov 2018 06:38 AM PST Considering global warming, it must create chaos in migratory paths of animals that have been doing it for centuries. submitted by /u/VitorMaGon [link] [comments]

How does Molasses get nutrition when brown sugar has no nutrition? What happens in the manufacturing process to give the minerals its known for? Posted: 23 Nov 2018 05:51 AM PST submitted by /u/NautiusV [link] [comments]

Why do we need to vaccinate children? Why don’t children inherit those helpful antibodies from their inoculated mothers? Posted: 22 Nov 2018 08:36 PM PST submitted by /u/tildenpark [link] [comments]

How does torpor differ from sleep? Posted: 23 Nov 2018 12:42 AM PST submitted by /u/DrumSpace [link] [comments]

What are the effects of hormones and antibiotics in our food that are used today? Posted: 23 Nov 2018 03:57 AM PST submitted by /u/Doesntmatter25 [link] [comments]

Why does wet grass get attached to your shoes when you run on it? What effect does water have on grass that makes it do this? Posted: 23 Nov 2018 03:30 AM PST For example if you're wearing football boots and running on a wet pitch your boots get all grassy and unclean. Why does this happen differently when on a dry grassy pitch? submitted by /u/fin_fs [link] [comments]

If there are diseases we can get from animals, that are harmless to them, are there disesases that we can unconciously give to animals? Posted: 22 Nov 2018 08:57 AM PST Not sure if earth sciences are the correct field to ask, but it sounds correct submitted by /u/Badde00 [link] [comments]

Was there confirmed behaviours of animals washing themselves with certain substances to improve their body hygiene just like humans uses soup and the equivalent? Posted: 23 Nov 2018 02:51 AM PST submitted by /u/Geninue_NiceGuy [link] [comments]

Do animal fathers know their the father? Posted: 23 Nov 2018 02:49 AM PST Do they have a natural father instinct? What if they mate with multiple females? submitted by /u/helloroll [link] [comments]

Why is a noble configuration of electrons more stable than having a neutral charge for an atom? Posted: 22 Nov 2018 04:40 PM PST why would it be more stable for an atom to have a charge, than having an equal amount of protons and electrons? submitted by /u/steve_french99 [link] [comments]

Is there any difference on heart rate (how hard the heart pump) based on wether I'm sitting, or standing still or any other pose? Posted: 23 Nov 2018 12:29 AM PST Is there any difference on how hard the heart pumps blood if I'm sitting, standing still, laying on bed, Sitting with one leg folded above another? ​ Thank you. submitted by /u/Pupper_Hugger [link] [comments]

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I've heard that the surface of a fast spinning neutron star(pulsar) rotates at about 5th the speed of light with respect to the centre. If so, then would the periphery experience Lorentz contraction? How would it affect the structure of the star?

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• I've heard that the surface of a fast spinning neutron star(pulsar) rotates at about 5th the speed of light with respect to the centre. If so, then would the periphery experience Lorentz contraction? How would it affect the structure of the star?
• What makes honey "non-spoilable"?
• Why do lights always flicker when watched from very far away?(like a city on the horizon)
• Standing waves in space?
• What are the sources of error with atomic clocks?
• How does the brain determine which part of the body is experiencing a sensation?
• How viscous is liquid metal?
• How can the bacterial content of cheese be guaranteed to be the same or similar over time?
• Are higher mass isotopes more dangerous than lower mass?
• Why is the Planck length important and how was it measured?
• Do chameleons have melanophores?
• How do scientists determine the half-life of elements which take billions of years to decay?
• How is blood produced, and how does the body one when to stop producing blood?
• What is the oldest human skeleton/remains that have been found from ancient times?
• If an impact event occurred in the ocean, during the past, what evidence would we find today that it had happened?
• Do celestial events visible from Earth (like the birth of a star) take place in the past?
• To all doctors/surgeons, how are the organs in our body held in place?
• water boiling in a vacuum does it get hot?
• Is there a difference between denoting a single 10 megaton nuke and two 5 megaton nuke in succession?
• How do Radar and Lidar technologies, as used in autonomous vehicules, differenciate between their signal and the signal of a similar model?
• How do radio frequencies not constantly collide and how does bandwidth work?
• Why is the gram the SI base unit, and not the Kilogram?

I've heard that the surface of a fast spinning neutron star(pulsar) rotates at about 5th the speed of light with respect to the centre. If so, then would the periphery experience Lorentz contraction? How would it affect the structure of the star? Posted: 22 Nov 2018 05:30 AM PST I think I'm probably referring to the Ehrenfest paradox but I would like to know what happens to a neutron star which is rotating rapidly. Thanks. submitted by /u/tralfamadelorean31 [link] [comments]

What makes honey "non-spoilable"? Posted: 22 Nov 2018 02:10 AM PST Pretty much the title. Once my uncle found honey jar in the basement of his house which was stored there by my grand grandfather in early 1900's presumably, we ate it ( and didn't die). submitted by /u/emilazeri92 [link] [comments]

Why do lights always flicker when watched from very far away?(like a city on the horizon) Posted: 21 Nov 2018 10:45 PM PST I have no idea what flair i should choose. submitted by /u/Madraven820 [link] [comments]

Standing waves in space? Posted: 22 Nov 2018 01:52 AM PST When you put a bowl of water or sand on a subwoofer, you will get beautiful stort of standing waves. Were there experiments performed, where water bubbles in weightlessness were exposed to similar stimulation? I was thinking of it, as experiments like that could contribute to our understanding of the atomic structure, I suppose. If yes, what were the results? Did the resulting forms resemble anything familiar? submitted by /u/Schanitzl [link] [comments]

What are the sources of error with atomic clocks? Posted: 22 Nov 2018 12:24 AM PST Atomic clocks are so accurate that they only lose one second every fifteen billion years. Why do they lose that second? submitted by /u/calviniscredit11team [link] [comments]

How does the brain determine which part of the body is experiencing a sensation? Posted: 21 Nov 2018 10:22 PM PST How does the brain tell if a signal is coming from your pointer finger or middle finger? If All of the signals feed into the same place, how can the beak tell any difference? Are there different signals for each neuron? submitted by /u/rwahl [link] [comments]

How viscous is liquid metal? Posted: 22 Nov 2018 06:35 AM PST I've seen videos of both people appearing to stir liquid metal with long metal poles and videos of liquid steel spilling out of a container. How viscous is it? submitted by /u/Geohatz123 [link] [comments]

How can the bacterial content of cheese be guaranteed to be the same or similar over time? Posted: 21 Nov 2018 09:13 PM PST This question started after seeing a Youtube video on the production of Parmesan cheese; specifically, Parmesan-Reggiano cheese. I find this instance of cheese interesting for a few reasons: it is a very unique cheese, supposedly only truly producible in the specific regions of Parma, Reggio Emilio, Bologna, Modena, and Modena, in "the same lands the monks made it over 1000 years ago". This claim is reinforced by the consistent bacterial content of the cheese, containing bacteria supposedly found only in the region, which is fed into the cows that then produce the milk to make Parmesan-Reggiano cheese. This cheese production process is also carefully monitored and measured through virtually every step, helping to guarantee the end product. But, while I understand that there is a strict method to this cheese's production, and carefully measured controls at virtually every step, I find myself doubting that the bacterial content of the cheese can be so carefully controlled. My mind goes to proliferation of super bacteria in sterilized environments for instance; granted that these areas present limited or no competition for these super bacteria, who can reproduce at alarming rates freely due to lack of competition. But even then, these sterilized environments are supposed to be carefully controlled as well. Even in an area of intense competition, there are still traces of super bacteria amongst the flora of other bacteria. To substance my doubts, the video referenced even says that "bad bacteria" are present along with the "good bacteria" in the vat, but that cooking the milk removes all the bad bacteria as a result. But aren't there bacteria that can adapt to harsh temperatures? Wouldn't this mean, even eventually, that these bad bacteria would become more prevalent in the cheese? Given these observations, my question is ultimately: How can the bacterial content of cheese be guaranteed to be the same or similar over time? Furthermore, is there reason to be concerned that cheese production, especially under controlled conditions, is producing resistant super-bacteria in the very vats it is being made in? Love to hear feedback on this, as my curiosity is stoked. Appreciate the time as always! submitted by /u/JZaber [link] [comments]

Are higher mass isotopes more dangerous than lower mass? Posted: 22 Nov 2018 04:21 AM PST I became curious about smoke detectors and found out that isotopes have different mass numbers beside them, and i'm curious what makes different isotopes more dangerous, is it higher mass = more danger or is it a combination between neutrons, electrons, protons, and mass? submitted by /u/RallyRebel [link] [comments]

Why is the Planck length important and how was it measured? Posted: 22 Nov 2018 12:25 AM PST submitted by /u/any_username_ideas [link] [comments]

Do chameleons have melanophores? Posted: 22 Nov 2018 03:53 AM PST So as far as I'm aware chameleons have a layer of xanophores and then below it 2 layers of iridophores containing crystals that they can change the spacing between to reflect different shades of visible light in the the upper layer and infra-red light in the lower layer. What I'm not sure about though is do chameleon's have a layer of melanophores below the other layers. Some websites say chameleons have melanophores but I'm pretty sure they only assumed that as the mechanism they said was responsible for their colour change is no longer thought to be responsible for their colour change. submitted by /u/Carrmodo [link] [comments]

How do scientists determine the half-life of elements which take billions of years to decay? Posted: 21 Nov 2018 03:55 PM PST I guess it's simple with transuranic elements that decay very fast and rapidly stop emmiting detectable radiation. But what about elements such as Rubidium-87? submitted by /u/GCS3217 [link] [comments]

How is blood produced, and how does the body one when to stop producing blood? Posted: 21 Nov 2018 03:24 PM PST submitted by /u/Ghost-Of-Nappa [link] [comments]

What is the oldest human skeleton/remains that have been found from ancient times? Posted: 22 Nov 2018 03:19 AM PST Not in millions of years, but the age when the person died. I can't figure out how to phrase it to get meaningful results from searches. What I'm trying to find is some kind of 20,000+ year old remains of persons who lived to a ripe old age. submitted by /u/whiteypoints [link] [comments]

If an impact event occurred in the ocean, during the past, what evidence would we find today that it had happened? Posted: 21 Nov 2018 03:55 PM PST I know with land based impacts obviously you get the impact crater and its easy to find the detritus. What evidence would scientists use to locate and identify ocean based impacts that may have occurred hundreds or thousands of years ago. submitted by /u/Bluntag [link] [comments]

Do celestial events visible from Earth (like the birth of a star) take place in the past? Posted: 21 Nov 2018 01:42 PM PST This is going to take a bit of a twist. It's my understanding that nothing travels faster than light. Based on that, if a catostrophic celestial event occured many light years away and it resulted in doom for humans, our doom would be visually apparent for some time before we were affected. Correct? Simple Example: Per Google, the black hole at the center of our galaxy is estimated to be 25,000 light years from our solar system. If some catastrophic event occurred at the center of the milky way and it destroyed our galaxy... would it take 25,000 years for us to be aware of our fate? Is it possible for an initial event of destruction to have occurred 20,000 years ago, and for us to be completely unaware today? submitted by /u/saslumpff [link] [comments]

To all doctors/surgeons, how are the organs in our body held in place? Posted: 22 Nov 2018 01:46 AM PST Are they just floating around?? submitted by /u/KM-Lim [link] [comments]

water boiling in a vacuum does it get hot? Posted: 21 Nov 2018 07:08 PM PST i have seen videos where water boils in a vacuum. but does the water get hot, like in a kettle the heat comes from the element and the water boils. is it just bubbling water or is it really hot. ​ submitted by /u/bulldogg1066 [link] [comments]

Is there a difference between denoting a single 10 megaton nuke and two 5 megaton nuke in succession? Posted: 22 Nov 2018 12:57 AM PST detonating** my bad submitted by /u/PhD_in_corki [link] [comments]

How do Radar and Lidar technologies, as used in autonomous vehicules, differenciate between their signal and the signal of a similar model? Posted: 21 Nov 2018 10:07 AM PST If I understand the working principle of Radar correctly, one emits a signal and analyse the reflected signal. It can be used to measure speed via the Doppler effect or distance by measuring the time a signal took to bounce and be recaptured by sensors. But then, if someone were to emit a similar signal as the one used by your radar device, wouldn't the radar detect it and mistake it for its own, thereby creating potentially unwanted behavoir down the line? ​ I also wonder how frequent those events would be in, say, trafic with a few autonomous vehicules of the same brand. submitted by /u/pizza125 [link] [comments]

How do radio frequencies not constantly collide and how does bandwidth work? Posted: 21 Nov 2018 04:02 PM PST Hi Reddit, Two questions around the same lines. Firstly, If I had three radios transmitting, 1 at 1hz, one at 2hz, one at 4hz, would a receiver only see data arrive when they don't collide? The 1hz signal would always collide with 2hz and 4hz, the 2hz would always collide with 4hz and the 4hz would only have the first and third piece arrive with no collision? Secondly, when trying to understand bandwidth, if I had a radio using 20mhz of bandwidth on a 2ghz radio, does the transmitter encode data on 2,000,000,000 and on 2,000,000,001 and so forth up to 2,019,999,999? I really struggle understanding this part of radio frequency and cannot wrap my head around it. Thanks in advance submitted by /u/MyNameIsSteveNow [link] [comments]

Why is the gram the SI base unit, and not the Kilogram? Posted: 21 Nov 2018 07:53 PM PST Pretty much all physical SI base units make relatable scale sense, bar the gram, what gives? I know how much a Litre is in volume, and for water it's close to a kilogram, but why isn't it a gram instead? submitted by /u/Takakikun [link] [comments]

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Does Large Hadron Collider need re-calibration after redefinition of SI units?

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• Does Large Hadron Collider need re-calibration after redefinition of SI units?
• AskScience AMA Series: I'm Dr Melanie Windridge, a plasma physicist who combines science with adventure. I have summited Mount Everest to explore the science that gets us to the top and I've written a book about the northern lights. AMA!
• Why does the edge of the Oort cloud continue to revolve around the sun when its closer to Proxima Centauri? Why is the edge of the Oort cloud still considered part of the solar system?
• Is there an altitude on Venus where both temperature and air pressure are habitable for humans, and you could stand in open air with just an oxygen mask?
• If the Moon was orbiting the Sun instead of the Earth, would it be classified as a planet or a dwarf planet ?
• How did early scientists recognise a new element?
• Are how dinosaurs sound in movies based on scientific data or just how cool it sounds?
• What determines life expectancy in a lifeform?
• Is there any formula that can be used to calculate what temperature a white dwarf of a given mass will be in x years?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• Is strong narcissm necessarily a malignant/negative personality trait?
• Is there a relation between enthalpy of neutralization and the pH of acid if the alkali used for reaction is the same?
• Does the expansion of the universe equate into trajectories of space craft to make sure they hit their target ?
• Is Romain lettuce more susceptible to E. coli than other types of vegetation? If so, why?
• If the Sun would suddenly disappear, would it take us minutes to realize the gravity is gone?
• How much lower were water levels during the time of Polynesia expansion ?
• Why do we want to care about Hilbert spaces beyond our own three dimensions?
• Is the sun at the same focus for all elliptical orbits?
• Why is there no standardized way of measuring speaker-system audio quality? What makes it difficult to objectively assess?
• Why does the sun set at a different time every evening?
• Is there a standardized naming convention for stars and exoplanets?

Does Large Hadron Collider need re-calibration after redefinition of SI units? Posted: 20 Nov 2018 12:53 PM PST How are measurements in different detectors over at LHC connected to the current values of speed of light, kilogram, etc? Would redefinition of SI units need updates in other kinds of measuring devices in science laboratories across the world? submitted by /u/andrybak [link] [comments]

AskScience AMA Series: I'm Dr Melanie Windridge, a plasma physicist who combines science with adventure. I have summited Mount Everest to explore the science that gets us to the top and I've written a book about the northern lights. AMA! Posted: 21 Nov 2018 03:14 AM PST I'm Dr Melanie Windridge, a plasma physicist who combines science with adventure. In Spring 2018 I climbed Mount Everest and explored the science that helps climbers survive at high altitude and under extreme conditions. Along the way I spoke to experts and created a video series called "The Science of the Summit". It's hosted on the Institute of Physics' YouTube channel and covers statistics, fitness and training, risk and motivation, oxygen systems, mountain weather, the chemistry of clothing, communications in remote locations, physiology and medicine, and helicopter rescue. An improved understanding of high-altitude physiology, acclimatisation and nutrition was instrumental in the British success on Everest in 1953. Edmund Hillary and Tenzing Norgay were the first people ever to stand on the top of Everest. They were supported not only by their expedition climbing team mates but also by the work of physiologist Griffith Pugh and others. Since their successful summit, science, technology and our understanding of physiology at high altitude have further improved. In 2016 I published "Aurora: In Search of the Northern Lights". The book is a journey of discovery and explores the visual beauty, legends and science of the northern lights, including the developing threat of space weather. I'm fascinated by the aurora. It's a marvel unlike any other in which the powers of astronomy, geology, magnetism and atomic physics combine to create one of the wonders of the natural world. My explorations of the aurora have led me to many Arctic destinations such as Sweden, Norway, Canada, Iceland and Svalbard. I have written a blog about Science at the Extremes for several years. You can have a look and subscribe to it here: http://melaniewindridge.co.uk/blog_home I'm here to talk about science and adventure - my experiences on Everest and in the Arctic with the aurora, and the science and technology that support high-altitude climbers and how they have improved and developed over the years. I'll start around 4pm UT (11am ET). AMA! submitted by /u/AskScienceModerator [link] [comments]

Why does the edge of the Oort cloud continue to revolve around the sun when its closer to Proxima Centauri? Why is the edge of the Oort cloud still considered part of the solar system? Posted: 20 Nov 2018 11:46 PM PST From my understanding, the Oort cloud is like a sphere that revolves around the earth at a distance of up to 200,000 AU from the solar system. It is the edge of the solar system. Meanwhile, the closest star; Proxima Centauri is just 267,000 AU away. Why is the edge of the Oort cloud still considered part of our solar system when it is far closer to Proxima Centauri, and is the very edge of the Oort cloud still a sphere-like shape as is theorised? If so, why when it is closer to Proxima is it still considered a section of our solar system? Edit: Rephrasing submitted by /u/uriharibo [link] [comments]

Is there an altitude on Venus where both temperature and air pressure are habitable for humans, and you could stand in open air with just an oxygen mask? Posted: 21 Nov 2018 07:42 AM PST I keep hearing this suggestion, but it seems unlikely given the insane surface temp, sulfuric acid rain, etc. submitted by /u/Nerrolken [link] [comments]

If the Moon was orbiting the Sun instead of the Earth, would it be classified as a planet or a dwarf planet ? Posted: 21 Nov 2018 07:25 AM PST submitted by /u/choose_a_accountname [link] [comments]

How did early scientists recognise a new element? Posted: 21 Nov 2018 02:23 AM PST For example, I read that Scheele and Priestly discovered oxygen independently in 1772 and 1774 respectively, but it was Lavoisier, who (again independently) discovered it in 1775, that first recognised it as an element. What did Lavoisier see that the other two hadn't? submitted by /u/iwzhzbb [link] [comments]

Are how dinosaurs sound in movies based on scientific data or just how cool it sounds? Posted: 20 Nov 2018 09:24 PM PST submitted by /u/xain1112 [link] [comments]

What determines life expectancy in a lifeform? Posted: 21 Nov 2018 05:08 AM PST Yesterday I visited my neighbor and he introduced me to his parrot. a smart grey fella with a red chest. my neighbor then told me he was 77 years old. I thought it was freaky that this bird has lived this long and I started googling average life expectancies of animals, and they seem ... completely random?! So I wanted to ask, is there any science behind why some animals live longer and some don't and could you explain? submitted by /u/evilwalrusses [link] [comments]

Is there any formula that can be used to calculate what temperature a white dwarf of a given mass will be in x years? Posted: 21 Nov 2018 04:28 AM PST I have Googled around and only found incomplete ones that cannot really be used to calculate it. Thanks in advance to people for answers, not a homework question, I just have an unhealthy fascination with far future of the universe. I know that white dwarfs take 1015 years to cool to 5 K and possibly much longer than that as WIMP annihilation may heat them to 63 K (according to this often quoted, and good paper https://arxiv.org/abs/astro-ph/9701131 ) and that the oldest white dwarfs in our universe are 11-12 Gyr old and are at 3900 K, but I haven't been able to find any info about how fast it cools in the meantime. It seems that it cools very fast (in deep time terms) from the 100000 K temperature of a pre-white dwarf (planetary nebula's central star) to 25000 K of a "young" white dwarf like Sirius B (330 Myr old) then much more slowly to around 6200 K (Van Maanen's star, 3.13 billion years old) and MUCH slower than that to 3900 K (like WD 0346+246, which is almost 9 billion years older, but still has more than half of Van Maanen's star temperature). submitted by /u/RAMDRIVEsys [link] [comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 21 Nov 2018 07:11 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! submitted by /u/AutoModerator [link] [comments]

Is strong narcissm necessarily a malignant/negative personality trait? Posted: 21 Nov 2018 06:49 AM PST submitted by /u/Gargatua13013 [link] [comments]

Is there a relation between enthalpy of neutralization and the pH of acid if the alkali used for reaction is the same? Posted: 21 Nov 2018 06:47 AM PST I know that the temperature, mass and specific heat capacity affect the enthalpy but is there anything that would explain why different acids reacting with the same alkali would make a difference? submitted by /u/13R0 [link] [comments]

Does the expansion of the universe equate into trajectories of space craft to make sure they hit their target ? Posted: 20 Nov 2018 06:38 PM PST submitted by /u/GracelandMemphis [link] [comments]

Is Romain lettuce more susceptible to E. coli than other types of vegetation? If so, why? Posted: 20 Nov 2018 06:27 PM PST submitted by /u/bradtech34 [link] [comments]

If the Sun would suddenly disappear, would it take us minutes to realize the gravity is gone? Posted: 21 Nov 2018 05:18 AM PST Me and one of my colleagues (both absolute laymen) were discussing this just now. He argued that there is not gravity particle in the Standard Model and therefore gravity is not an 'interaction'. his conclusion was that this means that if the Sun would suddenly disappear the change in gravity would be literally instant, disregarding the speed of light. I personally do not believe this, since the speed of light as a cosmic speed limit has been ingrained into my mind by popular science programs. Can someone here please explain me how this would work theoretically? submitted by /u/Arkafold [link] [comments]

How much lower were water levels during the time of Polynesia expansion ? Posted: 21 Nov 2018 05:15 AM PST submitted by /u/IllstudyYOU [link] [comments]

Why do we want to care about Hilbert spaces beyond our own three dimensions? Posted: 20 Nov 2018 07:43 PM PST Practically speaking, I'm unable to see what uses we may have for solving extra-dimensional problems beyond our own three dimensional Euclidean space; That is to say, I fail to see any practical use or application of trying to understand what exists outside our plane of existance. Can anyone help explain to me why we created Hilbert space to begin with, and what we can do with them? submitted by /u/_Sunny-- [link] [comments]

Is the sun at the same focus for all elliptical orbits? Posted: 20 Nov 2018 11:18 PM PST Since there are two focii for any ellipse and the sun is at one focus of an elliptical orbit, is it the same one for all planets? submitted by /u/sirDeanofShire [link] [comments]

Why is there no standardized way of measuring speaker-system audio quality? What makes it difficult to objectively assess? Posted: 20 Nov 2018 03:19 PM PST Sure, there's a big subjectivity factor. But I would have thought there would be a way to holistically (or otherwise) quantify clarity, fidelity, warmth, space, and all the other things audiophiles seem able to discern, but technology apparently can't. submitted by /u/AnotherThroneAway [link] [comments]

Why does the sun set at a different time every evening? Posted: 20 Nov 2018 06:12 PM PST Why does the sun set at a slightly different time each evening? I thought the Earth rotated at the same speed constantly? submitted by /u/OigaShaboiga101 [link] [comments]

Is there a standardized naming convention for stars and exoplanets? Posted: 20 Nov 2018 01:22 PM PST submitted by /u/state_controlled [link] [comments]

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