Pages

Tuesday, May 1, 2018

How Precisely Are Satellites put into orbit? Is it to the meter?

How Precisely Are Satellites put into orbit? Is it to the meter?


How Precisely Are Satellites put into orbit? Is it to the meter?

Posted: 01 May 2018 02:38 AM PDT

AskScience AMA Series: We're a climate scientist and filmmaker with Vox exploring the melting Arctic and the impact it's having on global weather. AUA!

Posted: 01 May 2018 04:00 AM PDT

Hi /r/AskScience! I'm Jennifer Francis, a research professor at Rutgers University. I study the Arctic - how and why it's changing so fast, and how rapid Arctic warming and ice loss will likely cause more frequent extreme weather events in mid-latitudes where most of us live. Think strings of bomb cyclones, drought, heat waves, and even long cold spells.

And I'm Eli Kintisch, host/writer of Vox's THAW video series which explores the melting arctic in a series of three mini-docs. I got the chance to travel north in the middle of the Polar night on board a research vessel to share this story firsthand. We'll be on at 3 PM ET (19 UT), ask us anything!

Thanks to Vox and the /r/AskScience mods for setting this up. We'll be answering questions from the /u/vox account but signing off individually on each reply.

submitted by /u/AskScienceModerator
[link] [comments]

Are there advantages to rockets being aerodynamically shaped once they have left the atmosphere?

Posted: 01 May 2018 02:26 AM PDT

How much of a threat is space debris?

Posted: 01 May 2018 06:54 AM PDT

We keep seeing reports of how space debris is increasing continuously and yet we see new satellites being shot up daily. So is space debris that much of a threat or is it grossly overstated by the media? And if it is what can we do about it?

submitted by /u/A_confusedlover
[link] [comments]

Being that graphene can theoretically occur naturally, would it be considered a mineral?

Posted: 01 May 2018 07:05 AM PDT

Could graphene be considered a mineral? The reason I ask is because, since graphene is harder than diamond, the Mohs Hardness Scale would have to somehow factor in graphene. Could this possibly lead to adding an 11th hardness point Why, or why not?

submitted by /u/JCWMM_
[link] [comments]

How could hadrons containing top quark be produced?

Posted: 01 May 2018 06:34 AM PDT

I know that top quarks cannot produce hadrons because of their incredibly short lifetime.

Disregarding that; how can top quark conceivably produce hadrons, even if in bizarre conditions?

submitted by /u/88880
[link] [comments]

Why do so many people suffering sleep paralysis experience a threatening creature or presence?

Posted: 01 May 2018 12:55 AM PDT

I've noticed that most people who experience sleep paralysis describe something that could be construed as being scared of some kind of presence in their room, be it aliens, demons, succubi, ghosts and similar. What part of the human brain makes us hallucinate this, why is it activated as we go to sleep and why does the presence almost universally seem threatening or scary? It's so common that I assume there must be some part of the brain that specifically produces this experience. For bonus points, could this part of the brain also be responsible for religious experiences, i.e. something similarly supernatural but benign rather than threatening?

submitted by /u/Yurksdude
[link] [comments]

Why do we get vitamin D from the sun? Could we make a light that gives off vitamin D?

Posted: 01 May 2018 05:25 AM PDT

Why can't prosthetic fingers just "tie" to the muscle?

Posted: 30 Apr 2018 07:18 PM PDT

From what I understand, the finger is essentially just a string pulled by the muscles in your arms. If you lost half a finger, why can't a prosthetic just have a replacement string stuck onto the remaining half of the string? You wouldn't have feeling in the finger, but it should function the same as the original.

submitted by /u/Joshless
[link] [comments]

How did we figure out the shape of proteins and other organic compounds?

Posted: 30 Apr 2018 07:23 PM PDT

How did scientists discover the true and exact shape of such tiny patterns? The structures of some biomolecules seem to be perfectly 3D scanned shapes

submitted by /u/KitKatEater
[link] [comments]

Which region of the United States has the lowest probability of both meteorological and geological natural disasters occurring?

Posted: 30 Apr 2018 08:42 PM PDT

Essentially, what region of the United States is evidently the safest place to live if you wished to avoid being hit with all the natural disasters possible in North America (including, but not limited to, volcanic, hurricane, tornado, earthquake, flooding, fires, etc...)?

Obviously, nowhere is 100% completely safe and there are many other factors that can come into play in deciding this. But looking past the possible outside factors, which livable region has the lowest probability for disaster?

submitted by /u/RadiationDM
[link] [comments]

Why does the ANS have a two-neuron pathway versus the single neuron pathway involved in the Somatic Nervous System?

Posted: 30 Apr 2018 10:00 PM PDT

Are there advantages (or drawbacks) of using two neurons? Evolutionarily speaking, where did this difference arise? Also: Is there a functional difference in the preganglionic neuron being myelinated in the sympathetic system versus the ganaglionic neuron being myelinated in the parasympathetic system?

submitted by /u/brothernature487
[link] [comments]

Why is it when a glass of waters sits out for a long period of time bubbles start to form?

Posted: 30 Apr 2018 01:36 PM PDT

Do lights produce thrust?

Posted: 30 Apr 2018 09:04 AM PDT

I'm at my desk pretending my flashlight is a rocket. Does it actually produce any (super tiny) thrust if I left it going from the photons it emits?

Bonus question: if the answer is yes, how big of a flashlight would I need to leave earth?

submitted by /u/ActualPasta
[link] [comments]

Why are there weight limits on roads?

Posted: 30 Apr 2018 03:57 PM PDT

Is it possible to efficiently divide our attention in two?

Posted: 30 Apr 2018 10:11 AM PDT

Is it possible to think at two different things at the same time while still being efficient in what we are doing? By that I mean thinking about two complex notion like doing an algebra problem whike writing a dissertation.

Would it be possible to train our brain in doing two different things at one?

submitted by /u/Thekingiselsewhere
[link] [comments]

[Chemistry] What is the reaction happening in my US MRE heater bags? What gas is being produced?

Posted: 30 Apr 2018 11:04 AM PDT

I occasionally use US MRE when I am out on a hike or for a long day of fishing and I was wondering what was going on in there?

submitted by /u/Pwnzored1
[link] [comments]

Where do permanent magnets get their energy from?

Posted: 30 Apr 2018 11:14 AM PDT

When a permanent magnet gets close to magnetic materials like iron, it attracts that material. To move matter you need to turn some form of energy into kinetic energy, following the law of conservation of energy. Where does that energy come from in the case of permanent magnets? Do they get weaker over time?

submitted by /u/gamerscreed
[link] [comments]

How do we know that polar bears can smell prey from 32km away?

Posted: 30 Apr 2018 11:27 AM PDT

Do the put food 32km away (and clear everything beyond that radius) to see if the polar bear can smell it?

submitted by /u/Eydunsson
[link] [comments]

Monday, April 30, 2018

Why the electron cannot be view as a spinning charged sphere?

Why the electron cannot be view as a spinning charged sphere?


Why the electron cannot be view as a spinning charged sphere?

Posted: 30 Apr 2018 05:59 AM PDT

Are there any health benefits associated with sleeping on a schedule VS sleeping when you feel like it?

Posted: 30 Apr 2018 01:55 AM PDT

I was listening to Matthew Walker (Neuroscientist) speak on Joe Rogan's podcast, and it got me thinking...

If someone is hypothetically in a position where they don't have any deadlines associated with their work so they just sleep whenever they're tired... For example 4 hours here, 10 hours there, 2 or 3 naps one day, more sleep than necessary the next, etc. Is that any more or less beneficial than forcing yourself into a routine that doesn't feel natural?

In other words, I understand we train children growing up to sleep according to a specific schedule, but I wonder if that is simply a product of a functioning society or if it is actually good for you physiologically? It seems like the body naturally wants to shift the cycle, and that we have to force ourselves into consistency.

submitted by /u/phpworm
[link] [comments]

Can you get Vitamid D from a large enough fire?

Posted: 30 Apr 2018 05:22 AM PDT

The sun is essentially a huge bonfire way way far away, so can a smaller fire that's closer provide us with Vitamin D?

submitted by /u/Turtlphant
[link] [comments]

Is a 128 Gb memory stick just made up of two 64 Gb chips "glued" together or is it an entirely different technology that suddenly occupies half the space?

Posted: 29 Apr 2018 08:18 AM PDT

Memory sticks are so big on comparison to the chip inside them, so I guess they could stick 10 chips in it and create the "biggest ever" memory stick rather easily...

submitted by /u/disintegrationist
[link] [comments]

When people are in a coma, do hospital staff maintain their dental hygiene?

Posted: 29 Apr 2018 03:27 PM PDT

I would imagine just like when you sleep, bacteria are still growing on your teeth. Do they wake up with a bunch of cavities?

submitted by /u/noodlelimbs
[link] [comments]

Can extremely high-pitched sounds send compression waves through single molecules?

Posted: 30 Apr 2018 03:03 AM PDT

Also the inverse question: can single molecules be made to vibrate as to produce sound?

submitted by /u/Matt-ayo
[link] [comments]

How come we never have the red eyes effect on pictures nowadays? What changed in cameras?

Posted: 29 Apr 2018 09:28 AM PDT

Does the body all die at once if the brain dies first? Or do things shut down at different times?

Posted: 29 Apr 2018 04:27 PM PDT

Can I launch something small into orbit?

Posted: 29 Apr 2018 08:46 PM PDT

Friend and I are starting an aeronautics and aerospace club at my school. I know you can get weather balloons ~30km up fairly easily, but is it possible to get something in orbit? at least for a little while?

submitted by /u/BeeDick
[link] [comments]

Just watched a program about how the moon may have been formed, couple of questions in text?

Posted: 29 Apr 2018 10:08 PM PDT

My take away is, BM (before moon) the Earth had a 5 hour rotation OMG right?, AM (after moon) the moon has added 19 hours to our daily rotation. 1, is the Earth still slowing down? and by how much over how much time 2. will the Earth slow down to match the moons rotation reaching a kind of equilibrium? essentially having the moon locked in one place over on the Earth? 3. or will the Earth eventually stop rotating because of the moon?, and the moon just goes around the Earth while the Earth has stopped spinning?

submitted by /u/FBIsurveillanceVan22
[link] [comments]

How was it decided upon that there are 360 degrees in a circle? What makes a degree, a degree?

Posted: 29 Apr 2018 08:52 PM PDT

After large organ removal, what, if anything, goes back in?

Posted: 29 Apr 2018 06:34 PM PDT

I'm thinking specifically about when a lung is removed but I wonder the same thing about large sections of liver or intestine.

Left behind, I imagine, is a large void, nearly half your upper torso in the case of a lung. Is anything put there during surgery to fill that large void? Does it fill in naturally somehow?

submitted by /u/jordy1971
[link] [comments]

How did the Red Rocks form in Colorado? (Red Rock Amphitheater)

Posted: 29 Apr 2018 02:58 PM PDT

Tried Wikipedia-ing it and I didn't understand half the words used.

submitted by /u/pnr32
[link] [comments]

How does a submarime ascend and descend?

Posted: 29 Apr 2018 10:50 PM PDT

What is the need of n-dimensional geometry in mathematics, with n greater than 3 ?

Posted: 29 Apr 2018 02:30 PM PDT

Why don't the Appalachian mountains cause a rain shadow?

Posted: 29 Apr 2018 10:23 PM PDT

Is there a reason a greenscreen has to be green? Can other colours be used?

Posted: 29 Apr 2018 10:09 AM PDT

Are people with mental illnesses more likely to develop neurological diseases such as dementia and Alzheimers?

Posted: 29 Apr 2018 05:57 PM PDT

How do meteors burn and dissolve in the mesosphere when its -100 C out there?

Posted: 30 Apr 2018 03:10 AM PDT

I kinda know it's because of friction, but I need some elaboration.

submitted by /u/saainte
[link] [comments]

We think Earth has a magnetic field because of the iron in the core. But the sun and moon also have magnetic fields. What causes their magnetic fields)?

Posted: 29 Apr 2018 01:50 PM PDT

Tangled Cords = Slower Speed?

Posted: 29 Apr 2018 08:34 PM PDT

If a cord is tangled, will it fractionally reduce the speed of the information travelling along it?

I imagine it would be faster to travel in a straight line than it would through knots and turns.

May be a stupid question, I'm not the best with electronics.

submitted by /u/anonathen
[link] [comments]

Sunday, April 29, 2018

Brain tumors are known to directly cause depression, but could the opposite happen for someone that is already depressed?

Brain tumors are known to directly cause depression, but could the opposite happen for someone that is already depressed?


Brain tumors are known to directly cause depression, but could the opposite happen for someone that is already depressed?

Posted: 28 Apr 2018 08:54 PM PDT

To my knowledge, various different brain tumors can have negative emotional impacts such as depression or anxiety, but if an individual already suffers from these illnesses, could a tumor have a reversing like effect?

submitted by /u/dahdoc
[link] [comments]

What is the net greenhouse gas emission of agricultural causes?

Posted: 29 Apr 2018 05:31 AM PDT

Hi all, doing an economic report on how we need to reduce greenhouse gases without effecting the economy. I've done a few years of chemistry, so it was somewhat bothering me how people claim greenhouse gas is "created" (ie conservation of matter). Can someone with better knowledge of the topic explain whether or not my assumptions are justified:

1) Grass or wheat (grain) photosynthesise CO2 and water, "storing it" inside the plant matter

2) Cows digest said grass and wheat, releasing greenhouse gases into the atmosphere

3)The greenhouse gases is photosynthesised and Chemosynthesised, repeating the food cycle

By this assumption, the long term net greenhouse gas emission of cow digestion is a lot less then initially assumed, as the emission results from the digestion of food created for the animals. The same can't be said for the CO2 output from cars, as gas and oil takes millions of years to form, resulting in an "increase" in the atmosphere.

I obviously realise there will still be more greenhouse gas transferred into the atmosphere then there is consumed, but does anyone have any thoughts of how much this amount is? If I have made any massive fundamental errors please also correct me

Thanks for helping my curiosity!

Bonus question: Given cyanobacteria and algea account for 70-80% of O2 production why don't we just cultivate them to reduce greenhouse gases (hopefully no great oxygenation event 2.0)

submitted by /u/dfitt10
[link] [comments]

Is there any part in the body that cannot get cancer?

Posted: 29 Apr 2018 05:03 AM PDT

Do primates get under arm body odor as humans do?

Posted: 28 Apr 2018 08:13 PM PDT

How far do tectonic plates shift during an earthquake?

Posted: 29 Apr 2018 04:01 AM PDT

Why do so many drugs end in HCl (hydrochloride)?

Posted: 28 Apr 2018 02:23 PM PDT

Why are elements distributed non-uniformly in the earth's crust?

Posted: 28 Apr 2018 08:52 PM PDT

How do seems of gold or uranium end up in one rock formation but not another elsewhere? Why isn't the earth's composition uniform or closer to uniform? Is there something about our core or mantle that puts a little more uranium over here than over there?

submitted by /u/abusuru
[link] [comments]

Do the North Atlantic Oscillation and the Atlantic Multidecadal Oscillation have the same effect of North Atlantic climate conditions?

Posted: 29 Apr 2018 04:47 AM PDT

Does a positive index value of the NAO have the same effect on temperature/climate as a positive value of the AMO?

submitted by /u/Stootermore
[link] [comments]

why is chemical sunscreen put in certain perfumes?

Posted: 29 Apr 2018 12:09 AM PDT

the other day I read the ingredient label in a cologne and it had "ethylhexyl/octyl methometoxycinnamate" which i'm pretty sure blocks UVB rays

submitted by /u/undertakersarmpit
[link] [comments]

If I wanted to travel to the Sun, at which direction do I point my thrusters?

Posted: 28 Apr 2018 12:06 PM PDT

In a ship that are in earths orbit around the sun. I figure we already have momentum, so if I pointed the thrusters in the opposite direction of my momentum. Then I would decrease my speed around the sun and gravity should pull me in. I think

Or is it just as simple as pointing my engines away from the sun and head inwards? Like walking on one of the arms of a carousel towards the center.

submitted by /u/TheHuntedBear
[link] [comments]

what is the difference between our perception or thoughts and our subconscious?

Posted: 28 Apr 2018 12:54 PM PDT

its a very abstract thing to try and feel out the boundary between my own thoughts and the subconsciousness (that i can't access with those thoughts). are the thoughts just auxiliary and its all really just my subconscious, with those thoughts just bouncing around the brain but just don't go too close to certain areas that are too personal or traumatic, or just too complicated, sort of like how you can't think two thoughts simultaneously? OR, is it life that's just that complicated, and we're just helpless to understand it one thought at a time? or are thoughts not even quantifiable in that way at all; maybe I'm mixing thought up with perception, and if so, then would it just be my 'perception' that is unable to pierce the veil of my subconscious 'thought'? or in other words, can someone just explain what goes on when a human 'thinks'? or do we not actually think at all, in that way at least, in which case is this just whats called 'internal dialogue', that term where something like half of the population talks to themselves in a constant stream of thoughts but aren't crazy?

submitted by /u/lesbianseagull7
[link] [comments]

If an object exceeds the speed of sound it passes the sonic barrier. Is there an equivalent barrier passed when an object travels faster than light? If no then why?

Posted: 29 Apr 2018 12:25 AM PDT

Are there any known examples of jump discontinuities occurring in the natural world, (not related to manmade systems)?

Posted: 28 Apr 2018 03:20 PM PDT

Why does pouring water on a grease fire make it bigger?

Posted: 28 Apr 2018 05:53 PM PDT

I saw the post on r/WTF and it reminded me that I've always wondered.

submitted by /u/mynameisnotgrey
[link] [comments]

Are there examples of cancers that have a normal copy of p53?

Posted: 28 Apr 2018 02:12 PM PDT

It's been said that over 50% of tumours have a mutation in p53, but I can never find examples of tumours that actually have an intact p53 protein? Can these tumours even exist?

submitted by /u/Aristo_socrates
[link] [comments]

How does Plan B work?

Posted: 28 Apr 2018 02:34 PM PDT

Can Lactic Acid be considered an alcohol?

Posted: 28 Apr 2018 11:02 AM PDT

I was studying HS biology, respiration to be exact. Whilst solving the questions, I wondered the molecule structure of lactic acid. Once I looked at it, I realized it had a carboxyl group (like an acid) and an hydroxy group (like an alcohol). So can lactic acid be considered an alcohol as well as an acid?

Edit:hydroxide hydroxy, excuse my incorrect usage.

submitted by /u/themixedupstuff
[link] [comments]

How does the body make more blood after you finish bleeding?

Posted: 28 Apr 2018 11:52 AM PDT

As somebody who gets a lot of bad nosebleeds, especially during the winter, I've lost a lot of blood this way, and I've always wondered how more blood gets made once the bleeding stops

submitted by /u/SuperPvPNoob
[link] [comments]

Why is the mass attenuation coefficient inversely proportional to density (mac = μ/ρ)?

Posted: 28 Apr 2018 07:23 PM PDT

Wikipedia definition: "The mass attenuation coefficient, mass extinction coefficient, or mass narrow beam attenuation coefficient of the volume of a material characterizes how easily it can be penetrated by a beam of light, sound, particles, or other energy or matter."

Surely a denser material would make it harder for light to penetrate it? Therefore mass attenuation coefficient should be proportional to density?

submitted by /u/ten_mile_river
[link] [comments]

How are mineral seedbeds created?

Posted: 28 Apr 2018 03:08 PM PDT

What minerals are in trees that get deposited into the soil? Why do certain trees prefer this?

Edit: I'm being downvoted and I'm not sure why. This is my first post on here and maybe I'm missing something for my question? I'm learning about post fire forests and the texts mentions mineral seedbeds are produced after fire, but they never really mention what that is. Just that some trees prefer this and I don't really know what that means.

I tried Googling it too, but again, most of my results just studies where some plants respond better to this type of soil, but not sure of exactly why or what it is. Thanks in advance to anyone who can help me understand.

submitted by /u/wisksnxh
[link] [comments]

Why does having a certain amount of protons make an atom that specific element? Also, what would happen if all protons were removed from an atom?

Posted: 28 Apr 2018 06:08 PM PDT

So I'm a high school freshman who hasn't yet taken chemistry. However, I do know that the amount of protons in an atom make it a certain element, such as one proton making an atom Hydrogen. So why does having one proton cause the atom to exhibit the properties of hydrogen? Are an atom's properties more dependent on their neutron number (as in different isotopes)? And what would happen if all protons were removed from an atom and how would someone do that?

submitted by /u/Ashenborne27
[link] [comments]