Is long exposure necessary in taking pictures of "deep space" and if so, how come?

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• Is long exposure necessary in taking pictures of "deep space" and if so, how come?
• Why is it that when you feel mildly sick from dehydration, within merely the time it takes to drink water, you almost instantly feel better? Is it a psychosomatic case, or is the body that effective at taking in water?
• Why do you need to refrigerate some sealed foods after opening? Doesn’t the temperature matter even when it’s sealed?
• Are submarines vulnerable to storms on the sea?
• Is your brain able to make sense of the situation if one gets shot in the head? Is there any time between impact and death?
• Why does an ideal fuel:air mixture not burn completely, in practice? Why do the "lean" mixtures used in road vehicles not burn completely, either? Is there leftover oxygen, as well? If so, why is secondary air injection needed? Thanks.
• How were photographs sent back to earth from early satellites?
• How, and where do you find promethium?
• Why aren't white objects mirrors?
• Could somebody please better explain the difference between the speed of electricity through a conductor and an electron’s drift velocity?
• Does the Arthur–Merlin protocol in Complexity Theory have any connection with probabilistic "proofs" such as the Miller-Rabin Primality Test?
• Do you need a nervous system to get tired (i.e. experience tiredness)?
• Why do manual transmission cars typically have 5-6 instead of 7-8?
• How does testosterone make people become sexually attracted to others?
• How does the size of an atom change as you move through the periodic table?
• Is there any way to describe the right-handedness of a coordinate system without resorting to hands?
• How does the umbilical cord form?
• Why do we not know the exact 3-dimensional structure of the scrapie form of prion protein yet we know the proportion of alpha and beta sheets within its structure?
• How do people create "x-ray videos"?
• Is pH What Determines What Is an Antioxidant/Oxidant?

Is long exposure necessary in taking pictures of "deep space" and if so, how come? Posted: 29 May 2018 06:44 PM PDT If I had a quality telescope, and just zoomed into the general direction of the centre of the Milky Way, say, and took a quick photo, would I be able to see the centre in good quality? Edit: hoh, this blew up. Thanks for the responses! Now I know how it's done haha submitted by /u/TheSovietColossus [link] [comments]

Why is it that when you feel mildly sick from dehydration, within merely the time it takes to drink water, you almost instantly feel better? Is it a psychosomatic case, or is the body that effective at taking in water? Posted: 30 May 2018 05:01 AM PDT submitted by /u/Peakomegaflare [link] [comments]

Why do you need to refrigerate some sealed foods after opening? Doesn’t the temperature matter even when it’s sealed? Posted: 29 May 2018 05:26 PM PDT submitted by /u/SlackjawDonuteer [link] [comments]

Are submarines vulnerable to storms on the sea? Posted: 30 May 2018 03:25 AM PDT submitted by /u/Armauer [link] [comments]

Is your brain able to make sense of the situation if one gets shot in the head? Is there any time between impact and death? Posted: 29 May 2018 01:22 PM PDT Title. Might be a bit too macabre to post here. I don't know. I'm wondering if a brain has time to process anything if it gets completely destroyed, like in an explosion or something. submitted by /u/_Surge [link] [comments]

Why does an ideal fuel:air mixture not burn completely, in practice? Why do the "lean" mixtures used in road vehicles not burn completely, either? Is there leftover oxygen, as well? If so, why is secondary air injection needed? Thanks. Posted: 29 May 2018 08:37 AM PDT submitted by /u/T2QTIW31hmtGbNsq [link] [comments]

How were photographs sent back to earth from early satellites? Posted: 29 May 2018 09:21 PM PDT Digital cameras as we know them didn't exist in the late 1940s and 1950s, but I can't imagine that film was just ejected out of a satellite on a one way trip out of orbit and was expected to make it back to earth, much less survive reentry. submitted by /u/beau0628 [link] [comments]

How, and where do you find promethium? Posted: 30 May 2018 02:13 AM PDT submitted by /u/domino2017 [link] [comments]

Why aren't white objects mirrors? Posted: 30 May 2018 12:33 AM PDT If white objects reflect all light, then why don't they act like mirrors? Only think I can think of is maybe that white objects are "messy" in the way they reflect light? Like the reflections go in different directions but I don't know if that's right or if there's maybe a better explanation. And similarly, why are mirrors silver in color but reflect seemingly all light? submitted by /u/PatrioTech [link] [comments]

Could somebody please better explain the difference between the speed of electricity through a conductor and an electron’s drift velocity? Posted: 29 May 2018 10:11 PM PDT How is it that an electron's energy can travel at nearly the speed of light but it physically take an electron an hour to make it across a meter long conductor? This confuses me. submitted by /u/spooker11 [link] [comments]

Does the Arthur–Merlin protocol in Complexity Theory have any connection with probabilistic "proofs" such as the Miller-Rabin Primality Test? Posted: 30 May 2018 05:31 AM PDT Scott Aaronson refers to the MA complexity class as being about probabilistic proofs. Does this mean things such as probabilistic proofs of primality, such as Miller-Rabin, or is it referring to something completely different? submitted by /u/Jooseman [link] [comments]

Do you need a nervous system to get tired (i.e. experience tiredness)? Posted: 30 May 2018 03:54 AM PDT Can plants get tired? My rock looks tired. Is my rock tired though? What about my walls - are they tired? submitted by /u/MisterShizno [link] [comments]

Why do manual transmission cars typically have 5-6 instead of 7-8? Posted: 29 May 2018 01:11 PM PDT Wouldn't it be more efficient, especially at high speed, to have a larger gear ratio? With that said, isn't it common for automatic transmission cars to be "7-8 speed"? Why are larger gear ratios more common to automatic transmission vehicles? submitted by /u/StormwindChampion_ [link] [comments]

How does testosterone make people become sexually attracted to others? Posted: 29 May 2018 11:04 PM PDT I remember the day I started liking the opposite sex, but I don't understand how testosterone goes from my gonads to my brain to doing something in my brain that makes me start noticing figures and long legs. What does testosterone do once it reaches my brain that makes me like the opposite sex? submitted by /u/Greybleak [link] [comments]

How does the size of an atom change as you move through the periodic table? Posted: 29 May 2018 08:06 PM PDT I know that the mass of an atom is due primarily to the nucleus and the make up of its nucleus determines the atomic number. Since mass and density goes up as we go along the periodic table, I would assume that the overall volume of the atom itself must not increase in a linear way. i.e. an atom with 10 times the mass of hydrogen is not 10 times the volume. My question is this, if a hydrogen atom were the size of a baseball, how big would some of the other atoms be? (C, Au, U, etc.) submitted by /u/cpawoodwork2 [link] [comments]

Is there any way to describe the right-handedness of a coordinate system without resorting to hands? Posted: 29 May 2018 11:43 AM PDT submitted by /u/PolytheneMan [link] [comments]

How does the umbilical cord form? Posted: 29 May 2018 10:23 PM PDT submitted by /u/jakebirder1 [link] [comments]

Why do we not know the exact 3-dimensional structure of the scrapie form of prion protein yet we know the proportion of alpha and beta sheets within its structure? Posted: 29 May 2018 09:27 PM PDT submitted by /u/aberki1234 [link] [comments]

How do people create "x-ray videos"? Posted: 29 May 2018 09:14 PM PDT I am wondering how people get x-ray images that are videos. From how I understand normal x-rays work, it seems that a video would be impossible, and with my understanding of radiation exposure, probably be giving them cancer anyway. How would you take a video and not give the person involved cancer? example of what I am talking about here. submitted by /u/ModernAtomX [link] [comments]

Is pH What Determines What Is an Antioxidant/Oxidant? Posted: 29 May 2018 01:18 PM PDT Processed cocoa is cocoa that has been alkalized. It is said that it doesn't have as much antioxidative capability. Are all these "antioxidants in health"-publications just exploring the pH of the body? In other words, whats the difference between pH and a measure like ORAC? submitted by /u/citruskeptic1 [link] [comments]

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Does washing off fruits and vegetables before eating them actually remove much of the residual preservatives and/or pesticides?

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• Does washing off fruits and vegetables before eating them actually remove much of the residual preservatives and/or pesticides?
• Does radioactive decay reduce an object's mass?
• Is there a limit to how strong magnets can be? Or can we make stronger and stronger magnets with technological development/resources?
• How do firefighters put out fire on top floors of skyscrapers?
• How do we know the percentages of life that were wiped out in mass extinctions?
• Can single-cell organisms get cancer?
• After element 20, the neutrons begin to outnumber the protons in stable isotopes. Why do they need the extra neutrons?
• If sunscreen absorbs UV light, does that mean that sunscreen makes you warmer?
• Why is forming a chemical bond described as exothermic, whilst it appears to be endothermic?
• Can photons be slowed down by gravity?
• Why does being exposed to radiation increase your chance of cancer in the future?
• Why are both neutrons and protons required for stable nuclei (excluding hydrogen)? Why is there a more-or-less specific ratio between neutrons and protons?
• Why can't we convert the kinetic energy of the tires spinning back into energy to charge the battery of electric cars?
• Can a proton that is the result of beta minus decay undergo beta plus decay and the resulting neutron undergoes decay again and so on? If so, how many times?
• Is there a reason for the hexagonal pattern on the doors of microwaves?
• If a molecule can only have fixed energy levels then why is a Boltzmann distribution a smooth curve?
• Was it possible to see the first moonlanding via a telescope on our planet?
• If a nuclear apocalypse were to happen, and every single nuclear weapon in the world was used, how long would it take for the accumulating fallout to decay and make the surface habitable?
• Why are weather patterns so different in different parts of the United States?
• Do large nuculii extend beyond the range of the strong force?
• Why do storms develop after a hot day? And why do these storms sometimes get forecast but then seem to get pushed back later and never end up developing?
• Could electromagnetic power be transmitted over long distances as magnetic flux instead of electric current?

Does washing off fruits and vegetables before eating them actually remove much of the residual preservatives and/or pesticides? Posted: 28 May 2018 10:07 PM PDT submitted by /u/Jojothevo [link] [comments]

Does radioactive decay reduce an object's mass? Posted: 28 May 2018 10:25 AM PDT I've been trying to understand e=mc2 and one implication of that seems to be that emitting radiation (energy) would mean that an object's mass decreases. At least on a theoretical level, maybe not measurably. Is this the case? If not, how can that be reconciled with the equation? submitted by /u/ds1749320 [link] [comments]

Is there a limit to how strong magnets can be? Or can we make stronger and stronger magnets with technological development/resources? Posted: 28 May 2018 03:20 PM PDT If there is a limit, what sets it? If not, what is needed for a stronger magnet? submitted by /u/jonsins42 [link] [comments]

How do firefighters put out fire on top floors of skyscrapers? Posted: 29 May 2018 05:32 AM PDT I mean, they can't possibly have 50-floor ladders submitted by /u/Gaumir [link] [comments]

How do we know the percentages of life that were wiped out in mass extinctions? Posted: 29 May 2018 07:27 AM PDT I did a little digging in the sub(and Google) but couldn't find a question like this. How would we know that the Permian extinction wiped out roughly 90% of the planets population for example? From what I understand most of the fossilized remains we have recovered only represent a practically non-existent percentage of life that has existed throughout history. How can we even estimate current extinction rates, I haven't seen a list of the supposed dozens of extinctions occurring daily?(Though if they exist I would be very interested in seeing it) submitted by /u/Dabaus94 [link] [comments]

Can single-cell organisms get cancer? Posted: 28 May 2018 11:40 AM PDT submitted by /u/PM-ME-Y0UR-BOOBS [link] [comments]

After element 20, the neutrons begin to outnumber the protons in stable isotopes. Why do they need the extra neutrons? Posted: 28 May 2018 01:00 PM PDT submitted by /u/Arugula278 [link] [comments]

If sunscreen absorbs UV light, does that mean that sunscreen makes you warmer? Posted: 28 May 2018 02:34 PM PDT I have read that what makes sunscreen work is partly that it absorbs UV light. As everyone knows, objects in colours that absorbs visible light gets warmer in the sun (like a black t-shirt). Does that mean that you get warmer in the sun with sunscreen than without? submitted by /u/mountwebs [link] [comments]

Why is forming a chemical bond described as exothermic, whilst it appears to be endothermic? Posted: 28 May 2018 10:16 PM PDT Little bit of background info: Currently I study UK A-Level Chemistry and physics, so please don't expect too much. Recently, when studying energetics (enthalpy changes, bonding, etc.) I noticed what appeared to be contradicting statements. For chemical bonding, in terms of energetics, we are taught exclusively that bond breaking is endothermic, and bond forming is exothermic (in all cases). This however contradicts other information that I have read in terms of bonding within carbon; that is that when carbon forms four covalent bonds, the electrons in the 2s sub-shell move to the (higher energy) 2p sub-shell making a hybrid orbital with four electrons. If electrons move to a higher energy level to allow bonds to form, such an interaction would require energy to be taken in by electrons to be in an excited state, and therefore be endothermic. It is taught in our syllabus however, that bond forming is exothermic. I have no doubt that my syllabus is correct, but could someone offer an explanation as to why this is the case? I asked both of my chemistry teachers, yet couldn't get an explanation, and searching the web fails to find specific enough results. Footnote: Sorry about the formatting, and any grammatical errors, this was posted on mobile. and for the unrelated title, I really didn't know what to put considering the question mark was compulsory. EDIT: Thank you all for all of the excellent quality, understandable answers, and I look forward to reading into this concept a little more after the school break as it does seem quite interesting. submitted by /u/lasqi [link] [comments]

Can photons be slowed down by gravity? Posted: 28 May 2018 02:01 PM PDT If gravity can curve light, can it slow it? submitted by /u/alonchalo [link] [comments]

Why does being exposed to radiation increase your chance of cancer in the future? Posted: 28 May 2018 02:14 PM PDT By this I mean, why does it increase your chances later in life and not just as soon as you are exposed submitted by /u/PM_ME_BOXBOX_NUDES [link] [comments]

Why are both neutrons and protons required for stable nuclei (excluding hydrogen)? Why is there a more-or-less specific ratio between neutrons and protons? Posted: 28 May 2018 02:57 PM PDT And what causes instability in neutron-rich nuclei, if it's the protons that destabilize the nucleus due to electrostatic repulsion? submitted by /u/unia_7 [link] [comments]

Why can't we convert the kinetic energy of the tires spinning back into energy to charge the battery of electric cars? Posted: 28 May 2018 05:51 PM PDT submitted by /u/mrnibbles23 [link] [comments]

Can a proton that is the result of beta minus decay undergo beta plus decay and the resulting neutron undergoes decay again and so on? If so, how many times? Posted: 28 May 2018 09:12 PM PDT Artificially/Naturally I understand that mass is converted into energy and if so, how many times can it happen? submitted by /u/karrablaster123 [link] [comments]

Is there a reason for the hexagonal pattern on the doors of microwaves? Posted: 29 May 2018 03:26 AM PDT Or is it just better if we don't see what's in there 100% clearly? submitted by /u/endisnearhere [link] [comments]

If a molecule can only have fixed energy levels then why is a Boltzmann distribution a smooth curve? Posted: 28 May 2018 01:12 PM PDT Hi, If a molecules energy level is quantized, why does a Boltzmann distribution look like this: http://noyesharrigan.cmswiki.wikispaces.net/file/view/MD_distribution.png/250991340/MD_distribution.png and not a linear distribution? submitted by /u/Box_xx [link] [comments]

Was it possible to see the first moonlanding via a telescope on our planet? Posted: 28 May 2018 12:46 PM PDT submitted by /u/vordster [link] [comments]

If a nuclear apocalypse were to happen, and every single nuclear weapon in the world was used, how long would it take for the accumulating fallout to decay and make the surface habitable? Posted: 28 May 2018 06:32 PM PDT submitted by /u/Insertusernamehere5 [link] [comments]

Why are weather patterns so different in different parts of the United States? Posted: 28 May 2018 02:15 PM PDT I don't mean so much the climates, rather the manifestation of weather. On the East Coast, it will rain for days on end, while in the desert, in the West, it will rain very hard for about half an hour and then it will be sunny for the rest of the day. What factors cause such a difference in the way that weather occurs? submitted by /u/ChezKicks [link] [comments]

Do large nuculii extend beyond the range of the strong force? Posted: 28 May 2018 12:44 PM PDT submitted by /u/Thrownawaybyall [link] [comments]

Why do storms develop after a hot day? And why do these storms sometimes get forecast but then seem to get pushed back later and never end up developing? Posted: 28 May 2018 12:35 PM PDT Self-explanatory title, but I just wondered because we have had a few hot days in the UK, and each day a storm has been forecast for early-mid afternoon. Then by the time it gets to midday it is pushed back later, and later.. what makes it so difficult to predict when/if a storm will develop after a hot day? submitted by /u/SublimelySublime [link] [comments]

Could electromagnetic power be transmitted over long distances as magnetic flux instead of electric current? Posted: 28 May 2018 09:09 PM PDT My understanding of electromagnetism isn't as complete as I would like, but as I understand it, magnetic flux would rather be contained within ferromagnetic material than in the dielectric surrounding it, which seems like it should be better for power transmission than electric current which is in the dielectric surrounding the electric conductor. This difference makes it seem like the magnetic flux "resistance" (or what is the correct term?) of a ferromagnetic wire or chain should be lower than the resistance of electric wire. The flux might be alternating, rotating or possibly even both alternating and rotating depending on what is able to be transmitted most efficiently. It seems like at least one big advantage of using magnetic flux instead of electric current would be in the use of cheap iron wire or chain rather than more expensive aluminum, copper or copper-plated electric wire. I assume someone must have already thought of this if it really is a viable idea, so what am I forgetting? submitted by /u/dalkon [link] [comments]

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How come when hot metal is placed in cold water, it does not shatter like glass?

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• How come when hot metal is placed in cold water, it does not shatter like glass?
• Can metals evaporate? If so, can the gas be condensed back into solid metal?
• How does Vitamin D absorbed from the sun vs. orally supplemented Vitamin D affect the human body?
• I've heard that Pangaea didn't have much in the way of mountain ranges, but shouldn't a supercontinent comprised of plates that smashed together have some massive mountain ranges? How do we know one or the other is true?
• Why do amputated body parts not grow back even if bones can heal themselves?
• Does everything emit radiation?
• Why can't your immune get rid of bacterial STDs like syphilis etc?
• Since cats don't sweat/perspire; Does moving air, from a fan for instance, cool them off in hot weather?
• Do large asteroids impacting Jupiter reach the surface or do they begin swimming in the thick atmosphere at a certain altitude?
• What happens to the bullets that are shot into the air?
• Are electric and magnetic fields made out of photons (since the photon is the force carrier)? If so, why aren't those fields affected by a physical barrier like visible light is?
• How do nutritional scientists empirically test if certain types of food are "healthier" than others (e.g. white vs brown rice)?
• How did scientists measure the speed of light?
• Why do we tear up when we laugh too hard?
• Why do we "lose our appetite" when we see things we find disgusting, or otherwise unappealing?
• Has a link been found between red meat and heart disease in any mammal other than humans?
• How does the body signal beard follicles to start growing and why does it sometimes happen after puberty?
• Does Bell's inequality rely on photon polarisation being undefined before measurement rather than simply unknown?
• I understand why transition metal compounds have different colours and flame tests, but why are pure metals like copper, gold, and iron diffierent colours?
• If you bailed out of an airplane flying at supersonic speeds would the wind rip off or burn off your skin?

How come when hot metal is placed in cold water, it does not shatter like glass? Posted: 27 May 2018 10:36 AM PDT submitted by /u/HolyShamrockBatman [link] [comments]

Can metals evaporate? If so, can the gas be condensed back into solid metal? Posted: 27 May 2018 11:45 AM PDT submitted by /u/guuitar22 [link] [comments]

How does Vitamin D absorbed from the sun vs. orally supplemented Vitamin D affect the human body? Posted: 27 May 2018 01:06 PM PDT submitted by /u/jockcel [link] [comments]

I've heard that Pangaea didn't have much in the way of mountain ranges, but shouldn't a supercontinent comprised of plates that smashed together have some massive mountain ranges? How do we know one or the other is true? Posted: 27 May 2018 09:06 AM PDT submitted by /u/sluggathugga [link] [comments]

Why do amputated body parts not grow back even if bones can heal themselves? Posted: 27 May 2018 08:11 AM PDT submitted by /u/mountainbull [link] [comments]

Does everything emit radiation? Posted: 27 May 2018 04:01 PM PDT https://en.m.wikipedia.org/wiki/Planck_temperature This makes it seem like everything thar isnt at absolute zero emits radiation, and we can measure the temperature of an object by measuring the wavelength of the light it emits Can I put a person in some kind of faraday cage and take their surface temperature by measuring the amount/quality of EM energy they emit? Can I measure the temperature of a light bulb based on its color? submitted by /u/jehan60188 [link] [comments]

Why can't your immune get rid of bacterial STDs like syphilis etc? Posted: 27 May 2018 09:23 AM PDT submitted by /u/Laamis [link] [comments]

Since cats don't sweat/perspire; Does moving air, from a fan for instance, cool them off in hot weather? Posted: 27 May 2018 12:00 PM PDT submitted by /u/pic_vs_arduino [link] [comments]

Do large asteroids impacting Jupiter reach the surface or do they begin swimming in the thick atmosphere at a certain altitude? Posted: 27 May 2018 12:53 PM PDT With Juno amazingly confirming the clouds of Jupiter to go as far as 3000km down, I was wondering if an asteroid could actually reach the surface or if it would be stopped by the increasingly dense clouds on Jupiter. submitted by /u/zebleck [link] [comments]

What happens to the bullets that are shot into the air? Posted: 27 May 2018 02:06 PM PDT They surely fall down after a while right? If correct, they can easily cause damage or even harm to someone submitted by /u/frey1337 [link] [comments]

Are electric and magnetic fields made out of photons (since the photon is the force carrier)? If so, why aren't those fields affected by a physical barrier like visible light is? Posted: 27 May 2018 04:01 PM PDT Photons are force carrier particles that carry the electromagnetic force; if so, how come those fields aren't affected by a physical barrier? I've heard that fields aren't made out of anything, but I've also heard that they are an exchange of particles. submitted by /u/qwerty-_-123 [link] [comments]

How do nutritional scientists empirically test if certain types of food are "healthier" than others (e.g. white vs brown rice)? Posted: 27 May 2018 12:28 PM PDT submitted by /u/H09909 [link] [comments]

How did scientists measure the speed of light? Posted: 27 May 2018 08:03 AM PDT With the speed of light being so fast, how do scientists measure it? I would think the instruments we use now wouldn't be able to detect something moving that fast. submitted by /u/ivaldx [link] [comments]

Why do we tear up when we laugh too hard? Posted: 27 May 2018 10:10 AM PDT submitted by /u/VulcanMadeFox [link] [comments]

Why do we "lose our appetite" when we see things we find disgusting, or otherwise unappealing? Posted: 27 May 2018 09:53 AM PDT submitted by /u/FossilFuelsPhoto [link] [comments]

Has a link been found between red meat and heart disease in any mammal other than humans? Posted: 27 May 2018 05:05 AM PDT There are many obligate carnivores that eat red meat almost exclusively. Can this diet cause heart disease? And if not, what are the adaptations that humans do not have? submitted by /u/platypus_stalker [link] [comments]

How does the body signal beard follicles to start growing and why does it sometimes happen after puberty? Posted: 27 May 2018 09:00 AM PDT submitted by /u/et809 [link] [comments]

Does Bell's inequality rely on photon polarisation being undefined before measurement rather than simply unknown? Posted: 27 May 2018 09:27 AM PDT My reading of EPR is that simple values such as momentum must have a value even when not measured, which flies against the uncertainty principle and wavelike nature of particles. I've tried reading Bell's papers and subsequent ones and I can't tell whether they rely on the photon having an uncertain polarisation before measurement, but a hidden variable defining the outcome of the measurement, rather than an unknown polarisation before measurement and the outcome of the measurement being probabilistic. Can someone point me to anything that helps me understand this better? submitted by /u/yeast_problem [link] [comments]

I understand why transition metal compounds have different colours and flame tests, but why are pure metals like copper, gold, and iron diffierent colours? Posted: 27 May 2018 07:39 AM PDT submitted by /u/hex6t6 [link] [comments]

If you bailed out of an airplane flying at supersonic speeds would the wind rip off or burn off your skin? Posted: 27 May 2018 04:29 AM PDT submitted by /u/TyranniCreation [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
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