How many times do most galaxies rotate in their lifetimes?

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• How many times do most galaxies rotate in their lifetimes?
• When an object is travelling at speed, at what point does it go from being cooled (by air resistance) to heating up and eventually burning up?
• How do quantum computers get programmed?
• Are any of Einstein's predictions yet unproven, and if so, which would be the most groundbreaking if proven correct?
• What is generally used to cool down superconductive elements?
• When a supernova explode and collapse to a black hole, how much time does it takes from explosion to being a singularity ?
• Would our sun (Sol) be visible from Alpha Centauri?
• For a series circuit with a voltage source and three resistors, after current flows through all resistors, why does the voltage drop to zero?
• How are aqueous solutions of metal ions prepared?
• What would happen with two telescopes?
• When searching for exoplanets, do astronomers have to account for the planets size?
• Now that the Earth and Moon have been tidally locked for a decent while, what interesting differences can we find between the Regolith (or deeper layers) on either "side" of the moon?
• Are there any promising New ways to fight antibiotic resistance in bacteria?
• Whаt сausеs осulаr dоmіnаnсе?
• How does olfactory fatigue work?
• When does a star 'ignite' and is it instantaneous?
• How stable are the Lagrange points?
• In DC power transmission down a wire, what is really transmitting the power, the electrons slowly bumping along, or the photons propagating the EM field?
• Is it possible to pick 6 colors with the most amount of contrast between them?
• If an object is in orbit, meaning it is in free-fall, what stops it from accelerating indefinitely?
• What are the greatest pros and cons of MOND, Teves, and Conformal Gravity?
• How does the decibel system in water compare to in air? Do humans perceive things to be louder underwater?
• With new experiments showing the speed of light isn't constant, what does this mean for relativity?

How many times do most galaxies rotate in their lifetimes? Posted: 30 Sep 2016 04:58 AM PDT submitted by /u/AlexTheGreat1221 [link] [comments]

When an object is travelling at speed, at what point does it go from being cooled (by air resistance) to heating up and eventually burning up? Posted: 29 Sep 2016 05:41 PM PDT When I ride my motorbike at 100km an hour, the air cools me and the bike, when a rocket re-enters the earths atmosphere, it appears to heat up. Is there an exact speed at which this happend? submitted by /u/Theplayground_nz [link] [comments]

How do quantum computers get programmed? Posted: 30 Sep 2016 05:05 AM PDT It's mor a "Where is the program saved and where can we save the results from the programms?" question, but the real programming is interesting as well. I don't thin they use Java or something like that ^ submitted by /u/Simyala [link] [comments]

Are any of Einstein's predictions yet unproven, and if so, which would be the most groundbreaking if proven correct? Posted: 29 Sep 2016 02:27 PM PDT Over 100 years after they were predicted by General Relativity, gravitational waves were observed by LIGO last year. Are there any more of his predictions floating out there? submitted by /u/sonofdarth [link] [comments]

What is generally used to cool down superconductive elements? Posted: 29 Sep 2016 08:01 AM PDT Not just in labs, I'd like to know what is used outside of it because I figure that labs probably use some way that is really effective but also expensive, which is logical, but unuseable in other ways beacuse of the cost, so I'm wondering what it is that does the trick for the outside of the lab use. EDIT: Thanks, I've been wondering for some time so I asked here rather than browse and possibly end up with wrong info. submitted by /u/slimreaperokc [link] [comments]

When a supernova explode and collapse to a black hole, how much time does it takes from explosion to being a singularity ? Posted: 29 Sep 2016 02:17 PM PDT Is the speed of the density increase constant, accelerated, decelerated ? In the time frame of a distant external observer submitted by /u/vilette [link] [comments]

Would our sun (Sol) be visible from Alpha Centauri? Posted: 29 Sep 2016 06:55 PM PDT Imagine an Earth like planet with an Earth like atmosphere in orbit around one of the stars in the Alpha Centauri system. Correct me if I'm wrong but on a cosmic scale it wouldn't make a huge amount of difference which star this planet is in orbit around. Would our star be visible to the unaided eye from this planet? submitted by /u/Starzajo [link] [comments]

For a series circuit with a voltage source and three resistors, after current flows through all resistors, why does the voltage drop to zero? Posted: 30 Sep 2016 06:49 AM PDT Voltage drops across every resistor. Say for example we have a 12V power source and after going through three resistors with 3ohms each, the 12V drops by 4V per resistor until it reaches zero. But is it really zero? Say, if we connect a fourth resistor after the third resistor, shouldn't there be a voltage reading across the fourth resistor? What should be the voltage value after going across three resistors if not zero? submitted by /u/xHamsaplou [link] [comments]

How are aqueous solutions of metal ions prepared? Posted: 30 Sep 2016 06:14 AM PDT I'm curious how they come up with these at chem problems. submitted by /u/Ytonic [link] [comments]

What would happen with two telescopes? Posted: 29 Sep 2016 05:12 PM PDT If you had one telescope and were able to zoom into the viewfinder of another telescope situated far away? Would you have a view of what the person looking through the second telescope would see, or would it be the combined magnification of the two telescopes? submitted by /u/gmikoner [link] [comments]

When searching for exoplanets, do astronomers have to account for the planets size? Posted: 29 Sep 2016 04:25 PM PDT I was always taught in school that the more mass an object has, the stronger its gravitational force becomes. Does that mean that exoplanets that are considered habitable have to be within a certain mass range so that are bodies don't just collapse from gravitational pull; like they would if you could theoretically go onto a neutron star? submitted by /u/Mythicdream [link] [comments]

Now that the Earth and Moon have been tidally locked for a decent while, what interesting differences can we find between the Regolith (or deeper layers) on either "side" of the moon? Posted: 29 Sep 2016 03:53 PM PDT submitted by /u/oreng [link] [comments]

Are there any promising New ways to fight antibiotic resistance in bacteria? Posted: 29 Sep 2016 04:47 PM PDT I know there is some interesting research into new antibiotics for which there are no resistance yet, but what seems to be the most interesting tool aside from that to fight these bacteria? submitted by /u/flaptamer [link] [comments]

Whаt сausеs осulаr dоmіnаnсе? Posted: 29 Sep 2016 03:21 PM PDT submitted by /u/redditsci [link] [comments]

How does olfactory fatigue work? Posted: 29 Sep 2016 04:25 PM PDT I can't seem to find specific scientific information about how it exactly works. Do we not really know? Or am I just bad at googling? The wikipedia page is surprisingly lacking... (specific as in what happens at the molecular level) submitted by /u/RaidenXT [link] [comments]

When does a star 'ignite' and is it instantaneous? Posted: 29 Sep 2016 12:28 PM PDT submitted by /u/Trippy_Ferret [link] [comments]

How stable are the Lagrange points? Posted: 29 Sep 2016 12:52 PM PDT We know that L1, L2, and L3 are inherently unstable, whereas L4 and L5 are stable. But how much does it take to actually affect the equilibrium of an object in an unstable Lagrange point? Let's say we have a ship parked at L1 between the Sun and the Earth. Now if this ship was to move a little closer to the Sun, its gravitational pull would obviously pick up, and the ship would inevitably fall towards the sun. But how much instability are we talking about? Astronomical scales are pretty huge in general, but how much displacement would it take to affect the ship's equilibrium? Is it in the order of the meter? Kilometer? Megameter? submitted by /u/justbourv [link] [comments]

In DC power transmission down a wire, what is really transmitting the power, the electrons slowly bumping along, or the photons propagating the EM field? Posted: 29 Sep 2016 11:57 AM PDT Who is the real hero? I'm guessing it's more complicated then this, does my question even make sense? submitted by /u/spectralwarp [link] [comments]

Is it possible to pick 6 colors with the most amount of contrast between them? Posted: 29 Sep 2016 11:57 AM PDT Not sure if this is in the right sub, or if it's the right flair. Shout-out to /r/cubers! I'm asking this because I solve Rubik's Cubes and the like as a hobby. A common thing to do is to swap out the stickers on your cubes to increase the contrast between them so that color recognition is easier. My question is, is there a set of 6 colors that is optimally contrasted from one another? submitted by /u/AldersRazor [link] [comments]

If an object is in orbit, meaning it is in free-fall, what stops it from accelerating indefinitely? Posted: 29 Sep 2016 03:53 PM PDT submitted by /u/Dee-Train [link] [comments]

What are the greatest pros and cons of MOND, Teves, and Conformal Gravity? Posted: 29 Sep 2016 09:48 AM PDT I am currently working on comparing these theories in relation to large cluster rotation and a few other areas. I am really new to this research so I was just hoping to see if I could get some back and forth on the topic along with all the articles and presentations I have been reading/watching. I have a good grasp on the concepts of each but the math isn't totally clear to me yet so I apologize for that. Thanks! submitted by /u/omniacgames [link] [comments]

How does the decibel system in water compare to in air? Do humans perceive things to be louder underwater? Posted: 29 Sep 2016 09:45 AM PDT Sperm whales are known to produce sounds of over 200 dB. Is this the same thing as 200 dB in air? Would it burst my eardrums if I was close to the whale? submitted by /u/spdalton [link] [comments]

With new experiments showing the speed of light isn't constant, what does this mean for relativity? Posted: 29 Sep 2016 11:35 AM PDT Reference: https://www.sciencenews.org/article/speed-light-not-so-constant-after-all I'm naive on this subject so, somebody please explain how this could affect our theory of relativity. submitted by /u/Xacto01 [link] [comments]

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Why do we keep trying to find new heavy elements if they only snap into existence for milliseconds?

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• Why do we keep trying to find new heavy elements if they only snap into existence for milliseconds?
• Since gravitational waves are real, does that mean all gravitational orbits are decaying?
• How did people measure light intensity before electronics existed?
• How can astronomers tell that a star is about to supernova?
• is there a critical mass at which an object in space can no longer be non-spherical and collapses under its own gravity?
• How do you explain this halo around the shadow in the image?
• Can we model the half-life of an isotope by isotopic characteristics?
• Are any two given temperatures guaranteed to have every temperature between them?
• Do crystal models of bulk solids work for describing everyday materials?
• Where could we settle on Mars?

Why do we keep trying to find new heavy elements if they only snap into existence for milliseconds? Posted: 28 Sep 2016 06:31 AM PDT Would these super-heavy elements have some use? Is it self-assurance? Thanks for the help, I'm only a sophomore in high school, but I'm super interested in this kind of science so try not to use to big of words, I think I have a somewhat basic understanding though. Again, Thanks! :) submitted by /u/XxCjkavyxX [link] [comments]

Since gravitational waves are real, does that mean all gravitational orbits are decaying? Posted: 29 Sep 2016 05:15 AM PDT As the waves would use up energy submitted by /u/TriangleGodsDenyYou [link] [comments]

How did people measure light intensity before electronics existed? Posted: 28 Sep 2016 07:25 PM PDT One of the reasons Quantum Mechanics was first created was that the intensity of light radiated from black body did not agree with the intensity predicted by the Rayleigh-Jeans equation. My question ii: How could they reliably measure the intensity of emmited light for each wavelength? submitted by /u/isnar000 [link] [comments]

How can astronomers tell that a star is about to supernova? Posted: 29 Sep 2016 07:24 AM PDT Specifically, how does a star behave right before it will supernova? Does the star begin to emit more neutrinos? Does its apparent size get smaller? Do the orbits of nearby planetary bodies change? submitted by /u/IWishIwasInCompSci [link] [comments]

is there a critical mass at which an object in space can no longer be non-spherical and collapses under its own gravity? Posted: 29 Sep 2016 04:49 AM PDT since i think it will most likely depend on the material lets say the object is made out of your average space rock/dust? submitted by /u/Once-a-lurker [link] [comments]

How do you explain this halo around the shadow in the image? Posted: 28 Sep 2016 03:59 PM PDT The shadow of this plane has a halo around it, the light looks diffracted and appears to only show the red and yellow... How do you explain the circular shape and diffraction of light around the shadow? submitted by /u/CyndaquilTurd [link] [comments]

Can we model the half-life of an isotope by isotopic characteristics? Posted: 28 Sep 2016 04:31 PM PDT I tried searching to no success. Can we model the half-life of an isotope by isotopic characteristics? Is an isotope's half-life duration a product of its number of protons, neutrons, electrons, some function thereof, or some other quantifiable observation? Or do we not know yet? submitted by /u/ValleyForge [link] [comments]

Are any two given temperatures guaranteed to have every temperature between them? Posted: 28 Sep 2016 12:04 PM PDT For example: if my hotpocket is 600 degrees in the middle, and 2 degrees on the outside, am i guaranteed to find every temperature between 2 and 600 in the hotpocket? submitted by /u/__Sanctuary__ [link] [comments]

Do crystal models of bulk solids work for describing everyday materials? Posted: 28 Sep 2016 07:13 AM PDT In my studies of condensed matter/solid state physics, we always model materials as fairly simple crystal lattices. This obviously works well for metals and things like diamond, but can these models be applied to everyday materials like wood and plastic? My instinct says no since these are made of complex molecules. What other models are there for describing the bulk properties of everyday complex solids? submitted by /u/nottherealslash [link] [comments]

Where could we settle on Mars? Posted: 27 Sep 2016 06:23 PM PDT Where are likely candidates for landing and colonization? What are the criteria that NASA and SpaceX are looking at? What are your initial impressions of the feasibility of this? Asking because of this: https://www.youtube.com/watch?v=0qo78R_yYFA submitted by /u/blue-footed_buffalo [link] [comments]

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[Physics] Are there rainbows on other planets? If yes, are their colors the same?

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• [Physics] Are there rainbows on other planets? If yes, are their colors the same?
• When I shine a laser through a piece of glass, did the photons coming out of the other side of the glass originate within the laser, or do the glass molecules produce photons with identical modes as the incident light?
• When talking about photons, what does "wavelength" actually mean?
• Is there any examples of cells dividing into 3 or more daughter cells at once instead of the traditional 2 from binary fission or mitosis?
• Is it impossible for something to get colder if it is in a perfect vacuum?
• how do you structure a research lab meeting?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• [Physics] Would there be any benefit to a space mission hitching a ride on an asteroid?
• Is there acceleration in the granular flow of sand in an hourglass?
• [Biology] Are there animals thathave roles like humans?
• Does the Earth's mantle have the same composition and ratio of elements as the crust?
• If you were in a swimming pool on the Moon or Mars - Would you float higher, lower or the same?
• Is cannabis a vasodilator, or vasoconstrictor?
• Do we know for sure that there isn't anything to be said for the concept of something being below absolute zero?
• Does centrifical force affect you while you're not in contact with the spinning object?
• How does a fixed radio telescope focus on a specific portion of the sky?
• What causes days with similar weather to have different temperatures?
• Why can't scientists reach absolute zero?
• Why exactly does water have such a high latent heat of vaporisation?
• Why don't Faraday cages emit their own radiation?

[Physics] Are there rainbows on other planets? If yes, are their colors the same? Posted: 27 Sep 2016 04:07 PM PDT submitted by /u/bitblogbr [link] [comments]

When I shine a laser through a piece of glass, did the photons coming out of the other side of the glass originate within the laser, or do the glass molecules produce photons with identical modes as the incident light? Posted: 27 Sep 2016 12:23 PM PDT Photon A ---> | Glass | ---->Photon B Is photon B generated within the glass? Or is B=A ? submitted by /u/ricksteer_p333 [link] [comments]

When talking about photons, what does "wavelength" actually mean? Posted: 28 Sep 2016 05:09 AM PDT When I think of waves, I'm accustomed to thinking of s-waves and p-waves, but it occurs to me that neither of these make any sense in regards to photons that are supposed to travel in a perfectly straight line with a constant speed. Individual photons don't have fluctuations of energy that I know of, either. So where does the idea of a "wavelength" fit in? submitted by /u/graaahh [link] [comments]

Is there any examples of cells dividing into 3 or more daughter cells at once instead of the traditional 2 from binary fission or mitosis? Posted: 27 Sep 2016 09:44 PM PDT submitted by /u/Gmoore5 [link] [comments]

Is it impossible for something to get colder if it is in a perfect vacuum? Posted: 27 Sep 2016 03:08 PM PDT submitted by /u/procrastination55 [link] [comments]

how do you structure a research lab meeting? Posted: 28 Sep 2016 08:17 AM PDT Hi I find myself in the curious situation of working in a clinical lab and having an idea which has turned into a fairly major research project with multiple institutions and more PhDs and MDs than I can count. Internally there are about 10 people working on it. How does one structure regular research lab meetings? submitted by /u/Grep2grok [link] [comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 28 Sep 2016 08:05 AM PDT 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]

[Physics] Would there be any benefit to a space mission hitching a ride on an asteroid? Posted: 28 Sep 2016 02:37 AM PDT From mainly an energy/fuel perspective would there be a benefit to a spaceship/land being launched from earth, landing on an asteroid when it passes nearby and then waiting until the asteroid is near some other interesting planet, and then launching itself off the asteroid to land on the planet? submitted by /u/illandancient [link] [comments]

Is there acceleration in the granular flow of sand in an hourglass? Posted: 27 Sep 2016 09:27 PM PDT Hello, I was wondering if the particles of sand falling in an hourglass experience any acceleration at all. So far, what I've learned is that the sand particles are not affected by their height or pressure in the hourglass, and only by g and the diameter of the small tube in the middle of an hourglass. If they are falling in free fall with g, wouldn't it be so that the particles fall at a constant velocity? When velocity is constant, acceleration is zero. To the eye, it seems as though the grains start to fall a bit faster when there are less grains left in one side of the hourglass. submitted by /u/mayank27tiwary [link] [comments]

[Biology] Are there animals thathave roles like humans? Posted: 28 Sep 2016 07:16 AM PDT Humans have jobs, like teacher, police officer, etc. Are there animals that have roles like this, I know bees have different kind of workers, but they are that type of worker since they were born. Sorry, if the flair or my grammar is incorrect. submitted by /u/Skipperwastaken [link] [comments]

Does the Earth's mantle have the same composition and ratio of elements as the crust? Posted: 27 Sep 2016 09:47 PM PDT For instance, platinum occurs in the crust with an abundance of 5μg/kg (per Wikipedia). Does this rate hold in the mantle? submitted by /u/PsyduckSexTape [link] [comments]

If you were in a swimming pool on the Moon or Mars - Would you float higher, lower or the same? Posted: 27 Sep 2016 02:25 PM PDT submitted by /u/aoeuaoue5 [link] [comments]

Is cannabis a vasodilator, or vasoconstrictor? Posted: 27 Sep 2016 08:47 PM PDT I've seen many conflicting arguments online. Forums say it's a dilator while some websites say it is a constrictor. submitted by /u/Salute_The_Bud [link] [comments]

Do we know for sure that there isn't anything to be said for the concept of something being below absolute zero? Posted: 27 Sep 2016 06:27 PM PDT I realize that in our universe we can only approach absolute zero energy with less and less of a return ad infinitum. I also realize that I might look like I don't understand the concept of movement because something below absolute zero would require "negative movement." Maybe this is a question relating more to math than physics, but is it possible within our current theories that there is actually is such a thing as "negative movement?" I remember hearing (correct me if this is wrong) that, while matter obviously can't go faster than the speed of light, with analogous constraints to absolute zero, if it did, it would technically be going backwards in time. It may not even be a phenomenon that could exist within a universe, making this more of a math question than a physics question, but even if you technically never reach absolute zero, mathematically, there still would have to exist a concept for what happens "when" the universe gets there. (or maybe I don't understand math either, I'm trying to learn). submitted by /u/VladTheLimpWhaler [link] [comments]

Does centrifical force affect you while you're not in contact with the spinning object? Posted: 27 Sep 2016 02:55 PM PDT My Dad is talking about centrifugal force as a kind of field. My question follows: Suppose you have a rotating, enclosed cylindrical object with a perfect vacuum in space (no gravity). If you enter from a hatch at the axis and push yourself straight at the other end, would you get pulled by centrifical force to the floor of the cylinder? We're curious because to my knowledge, centrifical force should only work while you're in contact with the spinning object. My Dad says otherwise. Also, what's the name of the force? submitted by /u/huttree [link] [comments]

How does a fixed radio telescope focus on a specific portion of the sky? Posted: 27 Sep 2016 01:06 PM PDT I imagine fixed radio telescope like the 500 FAST in China and the Arecibo observatory focus by changing the shape of the reflector dish since it is mesh and not a solid. submitted by /u/Azerphel [link] [comments]

What causes days with similar weather to have different temperatures? Posted: 27 Sep 2016 01:04 PM PDT Over the last three days, the temperature where I live has gone up by about 30 degrees, and is expected to drop by 10 in the next day or two, but the overall weather (mostly cloudless and sunny) has been the same for months. What causes the wild fluctuations in temperature? The amount of sun isn't changing, but I'm not sure what is. submitted by /u/CaptainUnusual [link] [comments]

Why can't scientists reach absolute zero? Posted: 27 Sep 2016 08:07 PM PDT I know that it almost impossible to reach absolute zero but what it happening that prevents us from reaching it? Also, how have scientists tried to reach absolute zero? submitted by /u/princecaramel50 [link] [comments]

Why exactly does water have such a high latent heat of vaporisation? Posted: 27 Sep 2016 10:03 PM PDT I have always belived it was to do with the hydoren bonding but a colleague suggested it could be to do with the rotational properties of the atoms storing heat energy as kintetic. Help me ask science you're my only hope (or google). submitted by /u/bornleverpuller [link] [comments]

Why don't Faraday cages emit their own radiation? Posted: 27 Sep 2016 07:18 PM PDT Having some trouble with this one: Assume we have a Faraday Cage with a radio inside. Don't the EM waves induce an electrical current in the Faraday Cage itself? Then, wouldn't the cage start emitting it's own radiation into space? That clearly must not happen, because it would not be a very good EM isolator. I guess this question works in reverse, also, with radiation coming from the outside. Thanks! submitted by /u/the_color_pizza [link] [comments]

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