AskScience AMA Series: We are the Ask an Astronomer Team at Cornell University. Ask Us Anything!

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• AskScience AMA Series: We are the Ask an Astronomer Team at Cornell University. Ask Us Anything!
• Did dinosaurs urinate like mammals or poo uric acid like birds?
• Power generator; rpm = output?
• How are memories stored at a cellular level?
• Descriptions of fusion ramscoops (Bussard ramjets) in literature often postulate a frontal funnel-like magnetic field to scoop up interstellar hydrogen. Would the interaction of this field with hydrogen generate friction, or a friction-like effect?
• Exactly what property of a quark is being described by its "color?"
• Why can other mammals safely eat raw chicken?
• Would it be possible to tell what *planet* an alloy was created on?
• Why is the half life of Tungsten-180 1.8 quintillion years? How is this verified?
• Why is "drifting" faster in some types of auto racing, but in other types, the traditional braking/apex/accelerating method is faster?
• Can you construct a constant Gravitational Field?
• When I dream, is my visual cortex being activated or is it merely a thoughtform?
• What determines the colour of a flame?
• What happens to Unruh radiation when I stop accelerating?
• What are shark teeth actually made of?
• How do ants pheremone trails work? And how do two colonies decide to peacefully merge?
• How tall is the Milky Way? Is it completely flat, as in there are no stars above or below us? Or is it like a cylinder?
• Why does the universe keep expanding?
• How it works the communication between Nasa and the curiosity rover?

AskScience AMA Series: We are the Ask an Astronomer Team at Cornell University. Ask Us Anything! Posted: 14 Aug 2017 05:00 AM PDT Hi Reddit! We are the Ask an Astronomer Team at Cornell University. We are a group of graduate students within the Department of Astronomy that volunteer to answer questions from the public, both online and in various events hosted throughout the city of Ithaca, NY. Our website (http://curious.astro.cornell.edu/) describes more of what we do and how to contact us. Its been a few years since our last AMA, but we're back to answer your questions about astronomy and the Universe! Answering questions tonight are 11 graduate students: Cristobal Armaza- My main interests orbit around theoretical astrophysics. Currently, I work on the implementation of a new code to solve the equations of hydrodynamics in astrophysical contexts. Paul Corlies- I study planetary atmospheres (clouds, hazes, etc), ground based observing, and solar system satellite development/instrumentation Dylan Cromer- I am interested in cosmology, specifically relating cosmological tests of dark matter and modified gravity theories by examining data from surveys of the cosmic microwave background. Andrew Foster - Planetary and Exoplanetary science, with a focus on atmospheres. Specifically, using radiative transfer to probe atmospheric structure and the composition of atmospheres and clouds. Also interested in chemistry and astrobiology. Avani Gowardhan- I study how supermassive black holes impact the growth and star formation in their host galaxies in the local universe Matt Hankins- I study massive stars and star formation in the Galactic center using infrared observations from NASA's SOFIA mission (https://www.nasa.gov/mission_pages/SOFIA/index.html). Thea Kozakis- I study the environments of Earth-like planets orbiting newly born and dying stars and their atmospheres. I mainly work on computer models to determine potential habitibility of planets Cody Lamarche- I study the interstellar medium in high-redshift galaxies to learn about star formation and supermassive black hole growth at a time when the universe was less than half its current age. Jack Madden- I study the climate and habitability of exoplanets using computer models. Ishan Mishra- I am interested in studying planetary science, exoplanets and habitability. Christopher Rooney- I study the movement of galaxies through the universe, though I'm interested in many different topics in astronomy Akshay Suresh- I am interested in studying stellar and planetary magnetic fields. We'll be on from 7-9 PM EDT (23-1 UT). Ask Us Anything! submitted by /u/AskScienceModerator [link] [comments]

Did dinosaurs urinate like mammals or poo uric acid like birds? Posted: 13 Aug 2017 10:34 AM PDT submitted by /u/Dahkma [link] [comments]

Power generator; rpm = output? Posted: 14 Aug 2017 03:08 AM PDT My father worked at the power plant in my home town. We were talking about steam pressures and turbine rotations per minute. He said once the rotor is synced to the grid at say 3,600rpm, that you can't just add more steam to get more electricity output. He started telling me about amps on the rotor and the phases of the stator, Excitors and brushes... Then he lost me. It seems to me that the more steam pressure you put on the turbine and the faster you make the rotor turn, then the more electricity you could produce. If this is not the case, then why not? submitted by /u/Tanc22 [link] [comments]

How are memories stored at a cellular level? Posted: 13 Aug 2017 06:04 PM PDT Moreover, are short term memories stored by a different physiological mechanism than long term memories? Or is all memory and learning achieved by the same fundamental cellular changes to neurons? submitted by /u/jdlc700 [link] [comments]

Descriptions of fusion ramscoops (Bussard ramjets) in literature often postulate a frontal funnel-like magnetic field to scoop up interstellar hydrogen. Would the interaction of this field with hydrogen generate friction, or a friction-like effect? Posted: 13 Aug 2017 09:12 PM PDT example: http://www.bisbos.com/images_spacecraft/bussard/ramjet_6_l.jpg submitted by /u/Gargatua13013 [link] [comments]

Exactly what property of a quark is being described by its "color?" Posted: 13 Aug 2017 12:54 PM PDT Quarks are labeled as red, green, and blue. But quarks are smaller than the wavelength of visible light, so they are not actually colored. I understand "color" is an easy way for scientists to distinguish and label different quarks, but what property is actually being described? submitted by /u/rooren-sama [link] [comments]

Why can other mammals safely eat raw chicken? Posted: 13 Aug 2017 04:39 PM PDT submitted by /u/strictlymovies [link] [comments]

Would it be possible to tell what *planet* an alloy was created on? Posted: 14 Aug 2017 06:58 AM PDT To me, it seems an atom is an atom is an atom. An atom of silicon on earth would be indistinguishable from an atom of silicon on mars or another part of the galaxy. I'm working on a "hard science" type science fiction novel. In the story, there are a few habitable planets with various cultures on them. I'd like for Planet A to create technology that is an attempted forgery of technology from Planet B. I'd like a scientist in the story to be able to figure out that this doohickey was actually created on Planet A, due to maybe trace amounts of this or that? I'd love some help with the science part of this if someone is interested! Thanks! submitted by /u/piratebroadcast [link] [comments]

Why is the half life of Tungsten-180 1.8 quintillion years? How is this verified? Posted: 13 Aug 2017 02:17 PM PDT Is there some set of differential equations that verifies this? submitted by /u/gnuforlyfe [link] [comments]

Why is "drifting" faster in some types of auto racing, but in other types, the traditional braking/apex/accelerating method is faster? Posted: 13 Aug 2017 05:23 PM PDT In some types of auto racing, such as rally and dirt oval track, oversteering through a curve is much faster. In most other types, such as F1 and asphalt oval track, it's all about preserving speed and grip through perfectly timed transitions and taking the perfect line. The same is true on motocross vs. Moto GP bike racing. What is the scientific reasoning for this? I assume it relates to the amount of traction the surface allows the tires to have, but why? How can having wheelspin and oversteer be faster than only driving as fast as the tire traction allows? submitted by /u/UndercoverFBIAgent9 [link] [comments]

Can you construct a constant Gravitational Field? Posted: 13 Aug 2017 08:46 PM PDT It is possible with both Electric and Magnetic field to construct an object that produces a field has the same value everywhere in a given space (capacitor for E field and Solenoid with B field). Would it be possible to construct an object that produces a constant Gravitational field? My intuition says no since both E and B fields have dipoles and gravity is effectively a monopole field (ie particles with mass only attract). Beyond that I'm not sure how the rest of the argument would follow. Am I on the right track? submitted by /u/SuicidalEclair [link] [comments]

When I dream, is my visual cortex being activated or is it merely a thoughtform? Posted: 13 Aug 2017 12:45 PM PDT Okay, so if I am dreaming, I am obviously experiencing the dream, but what I wonder is, does my brain experience this dream and the things that I "see" the same way that I experience and see things in real life? Or, is it all merely vivid imagination and you aren't really "seeing" the dream? submitted by /u/godinthismachine [link] [comments]

What determines the colour of a flame? Posted: 13 Aug 2017 06:26 PM PDT I've been told before that the blue/red-orange colour of a flame is due to the blackbody radiation from hot bits of soot etc. in the flame, rather than emission from heated air. If that's the case, why is the colour different when the flame has other elements, such as sodium or lithium. Is it a matter of soot being a relatively large object? submitted by /u/KerbalFactorioLeague [link] [comments]

What happens to Unruh radiation when I stop accelerating? Posted: 13 Aug 2017 09:53 PM PDT So, suppose I'm on a rocket, and I fire the engines. I'm now in an accelerating reference frame, and Unruh radiation is generated at some horizon, presumably very far away. However, if I wait long enough, I'll observe it. There's a cloud of particles zillions of light-years away, but heading my way. However, before they reach me, I stop the engines. Now, I'm in an inertial reference frame. If I wait long enough, will that cloud of radiation still reach me? Or does it "disappear" somehow because I'm in an inertial frame once again? submitted by /u/SurprisedPotato [link] [comments]

What are shark teeth actually made of? Posted: 13 Aug 2017 07:53 PM PDT I majored in Evolution and Ecology and currently teach high school biology, but I had a thought today that stumped me. Sharks are cartilaginous fish so they lack actual bone skeletons found in other types of fish. I know that cartilage can vary in strength and calcium levels, but what are a sharks teeth actually made of? Are they super calcified cartilage or some type of primitive/transitional bone? Also do they have the internal structures (root/nerve etc) that regular, bony teeth have? As someone who focused in marine bio I was a little ashamed that I don't know this, so thanks in advance!! submitted by /u/GlotzbachsToast [link] [comments]

How do ants pheremone trails work? And how do two colonies decide to peacefully merge? Posted: 13 Aug 2017 04:00 PM PDT submitted by /u/Altiar1011 [link] [comments]

How tall is the Milky Way? Is it completely flat, as in there are no stars above or below us? Or is it like a cylinder? Posted: 13 Aug 2017 11:23 AM PDT submitted by /u/MrBabadaba [link] [comments]

Why does the universe keep expanding? Posted: 13 Aug 2017 02:05 PM PDT submitted by /u/KOB-STR [link] [comments]

How it works the communication between Nasa and the curiosity rover? Posted: 13 Aug 2017 08:24 PM PDT I read somewhere that communication occur using radio signal, but the signal takes 13 minutes to reach curiosity rover, Nasa sends one command (take picture, send photos to earth, walk one meter) every 13 minutes? [grammar nazy correctors are welcome] submitted by /u/ggmoreira [link] [comments]

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When they announce discovery of a new breed of bird or fish or whatever, are they always meaning "Never before discovered" or does it sometimes mean a new crossbread from previous breeds/types?

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• When they announce discovery of a new breed of bird or fish or whatever, are they always meaning "Never before discovered" or does it sometimes mean a new crossbread from previous breeds/types?
• Theoretical physics- What if there was no speed limit like the speed of light?
• How can white noise and the Dirac distribution have the same Fourier transform?
• Why Do Particles Have More Energy When Apart?
• Why does hawking radiation cause black holes to evaporate?
• Does the ice sheet of Antarctica have a "bottle cap effect" on the recently discovered volcanoes underneath?
• Has the evolution of mammals and of the human race been a steady progression of increasing body size, or were there periods when our ancestral lineage underwent significant decreases in body size?
• Products, such as glue, that are purple but disappear/turn clear--how do they work?
• What is a Vector? What is a Tensor? And how are these two things used in AI and processor design?
• What changes in the brain causes different people to have varying working memory capacities?
• Is it possible to replace femur with something artificial?
• Can scaring someone actually cause a cardiac arrest? And if so how does it work on a electrical conduction level in the heart?
• If heat rises, why are higher altitudes so cold?
• Why is my facial hair a different texture than my head hair?
• What do we gain by making microchips smaller and smaller over time ?
• Do gas giants have a solid core?
• What is happening, on a cellular level, when we stretch?
• Why is there an nth root symbol when you can just write it as an exponent?
• In regard to scientific research, what is a treatment?
• Why don't Tesla cars break traction despite accelerating so much more quickly than combustion engine cars?
• In a wood fire, what is hotter and why, the glowing embers or the open flame?
• If lightning struck the ocean, how far away would you have to be to not get electrocuted?
• What keeps food from ‘going down the wrong pipe’ and doesn’t when said event occurs?

When they announce discovery of a new breed of bird or fish or whatever, are they always meaning "Never before discovered" or does it sometimes mean a new crossbread from previous breeds/types? Posted: 12 Aug 2017 08:14 PM PDT submitted by /u/wlane13 [link] [comments]

Theoretical physics- What if there was no speed limit like the speed of light? Posted: 12 Aug 2017 10:00 PM PDT I think that this may be a silly question, but what would happen in a universe where there was no speed limit? I understand that speed affects time dilation, etc., but what else would we lose? submitted by /u/Cay_Mang [link] [comments]

How can white noise and the Dirac distribution have the same Fourier transform? Posted: 13 Aug 2017 03:15 AM PDT I have learned in school (and confirmed with a quick Google search) that the Fourier transform of both white noise and the Dirac distribution to be the constant function F(f)=1 However, I am under the impression that the Fourier transform is a bijection, although I have never seen a proof of that claim (but I suppose we would take a lot more precautions before applying the inverse Fourier transform if it weren't bijective). Where's the catch ? submitted by /u/Gaazoh [link] [comments]

Why Do Particles Have More Energy When Apart? Posted: 13 Aug 2017 03:15 AM PDT I got some notes from my teacher on binding energy which states that 'Particles have more energy apart, and therefore more mass'. So, do any of you guys know why particles have more energy when apart and how this results in those particles having more mass? Thanks. submitted by /u/Eriod [link] [comments]

Why does hawking radiation cause black holes to evaporate? Posted: 13 Aug 2017 07:14 AM PDT My basic understanding of Hawking Radiation is that a particle-antiparticle pair will occasionally come into existence close to the event horizon. While in normal circumstances they would quickly annihilate each other, when near the event horizon it is possible for the anti-particle to be amalgamated into the black hole, and the particle to be emitted. Is it not equally as likely that the particle would be amalgamated, and the anti-particle emitted, leading to a no net loss/gain of particles or anti-particles? submitted by /u/alsiola [link] [comments]

Does the ice sheet of Antarctica have a "bottle cap effect" on the recently discovered volcanoes underneath? Posted: 13 Aug 2017 04:35 AM PDT I've already read discussions that the 91 volcanoes beneath the antarctic ice sheet might speed up global warming and rising sea levels should any of them erupt. But I'm wondering if the opposite might be true as well. For instance, a one trillion metric tons heavy iceberg drifted from the Larsen ice shelf in july. Could such decreased pressure from the arctic ice trigger volcanic eruptions in the near future? submitted by /u/Wickywire [link] [comments]

Has the evolution of mammals and of the human race been a steady progression of increasing body size, or were there periods when our ancestral lineage underwent significant decreases in body size? Posted: 12 Aug 2017 08:06 PM PDT Can the possibility be ruled out that we have direct ancestors which were larger than human beings? I cannot think of a particular epoch in which this could have occurred. There could perhaps have been a large synapsid in our lineage, or perhaps there was a very large fish. submitted by /u/omfalos [link] [comments]

Products, such as glue, that are purple but disappear/turn clear--how do they work? Posted: 12 Aug 2017 01:44 PM PDT I've seen several products, including glue, sunscreen, and fabric marking pens, that start out purple, but become invisible as the product dries, is rubbed in, or after some period of time. How does this disappearing purple effect work? Do all these products use the same compounds or mechanism to produce this effect? Why is it purple and not some other color? Can someone explain this at a layman level? submitted by /u/Back_Paragraphs [link] [comments]

What is a Vector? What is a Tensor? And how are these two things used in AI and processor design? Posted: 12 Aug 2017 09:27 PM PDT I don't have a math background which makes understanding the concepts of Vectors and Tensors difficult. However I have a strong interest in tech and that makes me curious as to why Nvidia's newest Tesla compute card has tensor math processor cores included, quite a lot of them. There are also several other companies working on processors specific to calculating tensor math, all for use in AI research. That leads to a lot of questions. What exactly is a Vector? The definition is "an object with Direction and Magnitude". Direction is fairly obvious, but how does Magnitude relate to reality? What exactly is a Tensor? I've seen several definitions, including "an object that linearly transforms one Vector into another" and "an object with two Directions and a Magnitude". And finally, how does Tensor math relate to AI research and things like self-driving cars? A note: This should probably have multiple flairs, but I don't think that's possible. submitted by /u/DJSpacedude [link] [comments]

What changes in the brain causes different people to have varying working memory capacities? Posted: 13 Aug 2017 06:11 AM PDT What I mean by working memory here is when you are doing a mental calculation you keep the numbers involved in memory briefly until the calculation is complete. I read this article in the guardian - Tracy Packiam Alloway: working memory is a better test of ability than IQ. The article suggest that a person's working memory capacity is considered mostly innate. So, some people are able to hold more pieces of data in their mind at the same time. What I am interested to know is what changes in the brain/nervous system (if there are any) that account for this difference. (eg- is a specific region of the brain larger? or submitted by /u/enzio901 [link] [comments]

Is it possible to replace femur with something artificial? Posted: 13 Aug 2017 02:48 AM PDT submitted by /u/nytman98 [link] [comments]

Can scaring someone actually cause a cardiac arrest? And if so how does it work on a electrical conduction level in the heart? Posted: 13 Aug 2017 02:31 AM PDT So i know people say "heart attack" when they actually mean a cardiac arrest, but is it actually possible to get one from a jumpscare or is that just a myth because people faint? Or does the brain actually sort of override/inhibit the electrical conduction nodes in the heart? submitted by /u/wouldlovetoknowitall [link] [comments]

If heat rises, why are higher altitudes so cold? Posted: 12 Aug 2017 03:35 PM PDT submitted by /u/viciouspics [link] [comments]

Why is my facial hair a different texture than my head hair? Posted: 13 Aug 2017 05:47 AM PDT submitted by /u/g3_SpaceTeam [link] [comments]

What do we gain by making microchips smaller and smaller over time ? Posted: 12 Aug 2017 05:16 PM PDT They say that every two years microchips and other computer parts get smaller, but shrinking said parts brings up problems that need to be fixed, but what I struggle to understand is why we bother going to such troubles and such lengths to shrink our computer parts in the first place. Wouldn't it make more sense to still research how to concentrate more computing power in a smaller area, but still keep our computer components he same size? submitted by /u/Madmax05072 [link] [comments]

Do gas giants have a solid core? Posted: 12 Aug 2017 12:39 PM PDT It would make sense that the gravity holding all the gas together would be emanating from something. submitted by /u/NukaSwillingPrick [link] [comments]

What is happening, on a cellular level, when we stretch? Posted: 12 Aug 2017 03:03 PM PDT submitted by /u/ShinFinder [link] [comments]

Why is there an nth root symbol when you can just write it as an exponent? Posted: 12 Aug 2017 08:54 PM PDT submitted by /u/BluePhoenix7AU [link] [comments]

In regard to scientific research, what is a treatment? Posted: 13 Aug 2017 02:30 AM PDT submitted by /u/El-Poco-Loco [link] [comments]

Why don't Tesla cars break traction despite accelerating so much more quickly than combustion engine cars? Posted: 13 Aug 2017 02:30 AM PDT submitted by /u/haneybd87 [link] [comments]

In a wood fire, what is hotter and why, the glowing embers or the open flame? Posted: 13 Aug 2017 02:23 AM PDT Extra question. What is the difference between open flame and combustion in embers like charcoal after the flame dies down or a cigarette? submitted by /u/GardenOctopus [link] [comments]

If lightning struck the ocean, how far away would you have to be to not get electrocuted? Posted: 12 Aug 2017 01:28 PM PDT submitted by /u/woddledoddle [link] [comments]

What keeps food from ‘going down the wrong pipe’ and doesn’t when said event occurs? Posted: 13 Aug 2017 01:55 AM PDT submitted by /u/Exhibente [link] [comments]

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Why does it take multiple years to develop smaller transistors for CPUs and GPUs? Why can't a company just immediately start making 5 nm transistors?

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• Why does it take multiple years to develop smaller transistors for CPUs and GPUs? Why can't a company just immediately start making 5 nm transistors?
• Probiotics are "good" bacteria sold in pharmacies, to be taken alongside antibiotics to protect your intestinal microbiome. How are they manufactured? How can a powder contain live bacteria? How do they survive without food in a paper envelope for years?
• Why can't we harvest energy from lightning?
• What causes aftertastes? Why don't all tastes occur immediately?
• How big is the chance that you drunk the same water molecule twice?
• Is the radius of our Observable Universe an absolute distance, or does it stretch proportionally according to the inflation of the Universe as a whole?
• Why is autism more common in boys than girls?
• Why is rabies incurable once symptoms appear?
• Would it be possible to project and therefore understand better the geometry of a 4-dimensional object with a 3-dimensional display?
• Why do the batteries in, say, an RC car only last a few hours, but it feels like the batteries in my TV remote have been in there for a lifetime?
• Why do tornadoes almost always rotate cyclonically when the coriolis effect should be negligible for something that small and fast?
• Does the same food have the same amount of calories as it is cold when it's hot?
• Why are we not able to feel the earth moving around the sun?
• What is the difference between a conventional weapon's recoil compared to a railgun?
• Does color affect non visible light?
• During a dream or nightmare, do our bodies have the same physiological responses to emotions that we do when we're awake?

Why does it take multiple years to develop smaller transistors for CPUs and GPUs? Why can't a company just immediately start making 5 nm transistors? Posted: 12 Aug 2017 01:08 AM PDT submitted by /u/LB333 [link] [comments]

Probiotics are "good" bacteria sold in pharmacies, to be taken alongside antibiotics to protect your intestinal microbiome. How are they manufactured? How can a powder contain live bacteria? How do they survive without food in a paper envelope for years? Posted: 11 Aug 2017 03:19 PM PDT Probiotics are live bacteria to be taken alongside antibiotics to protect your intestinal microbiome, as antibiotics often indiscriminately kill both "good" and "bad" bacteria. They are typically sold as a powder you're supposed to dissolve in water and then swallow. How are they manufactured? How can you turn bacteria into a powder (without killing them)? They typically have an expiration date of 3 to 5 years in the future. How can the bacteria survive all this time without any food? How come they don't reproduce until they're eaten by us? I can only assume they are somehow "frozen" (biologically inactive) until eaten. If that's the case, how does that work and how can they eventually "come back to life"? submitted by /u/RainbowDoc [link] [comments]

Why can't we harvest energy from lightning? Posted: 11 Aug 2017 07:59 PM PDT submitted by /u/orsai1 [link] [comments]

What causes aftertastes? Why don't all tastes occur immediately? Posted: 11 Aug 2017 06:56 PM PDT submitted by /u/ifhyr [link] [comments]

How big is the chance that you drunk the same water molecule twice? Posted: 11 Aug 2017 08:10 PM PDT submitted by /u/Thomas_baas [link] [comments]

Is the radius of our Observable Universe an absolute distance, or does it stretch proportionally according to the inflation of the Universe as a whole? Posted: 11 Aug 2017 07:31 PM PDT submitted by /u/BillnTedsTelltaleAdv [link] [comments]

Why is autism more common in boys than girls? Posted: 11 Aug 2017 06:39 PM PDT I've read that autism is 4x more common in men than women. Is this a fairly concrete fact, and if so, do scientists have any intuition why this is the case? submitted by /u/darkostwin [link] [comments]

Why is rabies incurable once symptoms appear? Posted: 11 Aug 2017 01:55 PM PDT submitted by /u/moskow52 [link] [comments]

Would it be possible to project and therefore understand better the geometry of a 4-dimensional object with a 3-dimensional display? Posted: 11 Aug 2017 04:15 PM PDT It is (obviously) possible to depict a 3-dimensional object on a 2-dimensional screen so using this same principle wouldn't it also be possible to depict a 4-dimensional figure on a display that uses 3-dimensions? submitted by /u/Deadshot_0826 [link] [comments]

Why do the batteries in, say, an RC car only last a few hours, but it feels like the batteries in my TV remote have been in there for a lifetime? Posted: 11 Aug 2017 12:22 PM PDT submitted by /u/HotelForDogsWasOkay [link] [comments]

Why do tornadoes almost always rotate cyclonically when the coriolis effect should be negligible for something that small and fast? Posted: 11 Aug 2017 12:03 PM PDT submitted by /u/blooper2112 [link] [comments]

Does the same food have the same amount of calories as it is cold when it's hot? Posted: 11 Aug 2017 01:54 PM PDT Ex. Does a frozen pizza have the same amount of calories before it goes into the oven as it does after? submitted by /u/ifailinstyle29 [link] [comments]

Why are we not able to feel the earth moving around the sun? Posted: 11 Aug 2017 01:03 PM PDT submitted by /u/zorbix [link] [comments]

What is the difference between a conventional weapon's recoil compared to a railgun? Posted: 11 Aug 2017 01:27 PM PDT By conventional weapons I mean things like guns using bullets or shells, using a chemical propellant. I know that the propellant explodes which causes an expansion of hot gas which pushes the projectile out the end of the barrel with the same amount of force as the weapon recoils (by Newton's Third Law). But what about railguns that use electromagnetic induction instead? Since there is no explosion, does that mean there is no recoil? Does Faraday's and Lenz's Laws apply at all? submitted by /u/lordplane [link] [comments]

Does color affect non visible light? Posted: 11 Aug 2017 11:04 AM PDT So I know that when we see color, it is the result of light striking that object and being reflected at a specific frequency. But does an object color also affect other forms of light besides visible? For example, would shooting a gamma ray at something orange differ the resulting wavelength from shooting it at something purple? submitted by /u/at_chan [link] [comments]

During a dream or nightmare, do our bodies have the same physiological responses to emotions that we do when we're awake? Posted: 11 Aug 2017 08:38 AM PDT submitted by /u/AnnArborLady [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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