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Friday, July 6, 2018

Why can I see star clusters better when they’re in my peripheral vision?

Why can I see star clusters better when they’re in my peripheral vision?

Why can I see star clusters better when they’re in my peripheral vision?

Posted: 05 Jul 2018 10:10 PM PDT

I oftentimes find that I can see clusters of stars (sometimes just a couple slightly larger ones) better out of the corner of my eye. But tonight I observed what I'm assuming is part of the Milky Way better when not directly looking at it. In fact, when directly looking at it, I really couldn't make out many stars.

Why might this be?

submitted by /u/catbearcarseat
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It's a broad question, I know, but how much do psychotropic drugs typically affect the spinal cord, peripheral, and enteric nerves?

Posted: 05 Jul 2018 09:06 AM PDT

Since alternating current is truly "alternating" why are most 2 pronged plugs (U.S) built with one prong wider than the other, forcing it to be used in the socket in only one direction?

Posted: 05 Jul 2018 08:14 PM PDT

What happens to the energy from UVA/UVB rays when I'm wearing sun screen? Is it reflected or absorbed, and if it's absorbed does this result in additional heat energy?

Posted: 06 Jul 2018 12:49 AM PDT

Does Meditation have the power to heal wounds faster?

Posted: 06 Jul 2018 06:47 AM PDT

Question is self explanatory and probably sounds unsual, but I've heard lots of benefits of meditation. So, does regular and consistent meditation over the years affect the body in any such way that it increases the healing capacity of the body?

submitted by /u/vandalsavagecabbage
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Can mountains disrupt the paths of hurricanes?

Posted: 05 Jul 2018 06:50 PM PDT

Hello r/askscience,

I know that mountains can create a rain shadow making the area down wind of the mountain very dry.

I was curious if you had a mountain range would it disrupt the hurricane and possibly break it up? Or would the hurricane just roll over the mountains like very little was there?

With my very very basic understanding( a few tens of minutes of reading) I would think the answer is yes. The edge of the hurricane would hit the mountains and be normal but as you got to the center of the hurricane there is less warm air up in the mountains and eventually all that will be left is cool air breaking the "engine" of the hurricane down.

Thank you for your help!

submitted by /u/edrazzar
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If Dark Matter is changing the rotation speed of stars in every galaxy, why does it not change the rotation speed of planets around stars?

Posted: 05 Jul 2018 09:51 AM PDT

I've always heard that galaxy motion is dominated by the gravitational effects of Dark Matter. Why then is there no measurable effect within our solar system?

submitted by /u/barvader
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How do they modify fruit to be seedless?

Posted: 05 Jul 2018 05:01 PM PDT

Why does catnip affect cats as it does? And are there other instances of this kind of reaction/mild addiction to specific plants in the animal world?

Posted: 05 Jul 2018 06:10 PM PDT

How do fiber optics provide greater internet speed, and how is the technology improving?

Posted: 05 Jul 2018 06:55 PM PDT

How does hemispheric control work with conjoined twins that share a torso.?

Posted: 05 Jul 2018 03:19 PM PDT

Are there any chemicals that are _close_ to igniting on contact with air, but aren't quite reactive enough?

Posted: 06 Jul 2018 01:19 AM PDT

More questions: What would scientists even look for to determine whether this was true about a given chemical? Is such a state theoretically possible, and If so, but no such chemical exists, what conditions would have to be satisfied to make it so?

submitted by /u/royishere
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In relation is plasmons, what exactly are near field and far field?

Posted: 06 Jul 2018 01:08 AM PDT

Are they just referring to different properties of a plasmon, some that effect the near by electric field, and some that effect the far electric field? The paper I'm reading (read as: trying to understand) that's using this terminology is "On the Energy Shift between Near-Field and Far-Field Peak Intensities in Localized Plasmon Systems" by zuloga

submitted by /u/sabi0
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Can other species suffer from gigantism?

Posted: 05 Jul 2018 04:13 PM PDT

If gigantism is a condition where your body produces too much growth hormones and most species have growth hormones why haven't I ever heard of or seen a picture of an animal with the condition?

submitted by /u/Vigna72
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Is it possible to simulate a fluid's motion without modelling it as a bunch of particles?

Posted: 05 Jul 2018 05:58 PM PDT

I do not understand fluid dynamics. Do real life fluids behave exactly like an infinite number of teensy particles, or is there something fundamentally different about their motion?

submitted by /u/aitigie
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Why does gyroscopic precession go at a speed inversely proportional to spin speed, while nodal precession of an orbit is directly proportional?

Posted: 05 Jul 2018 09:46 AM PDT

If you look here: https://en.wikipedia.org/wiki/Precession#Classical_(Newtonian)

We have an omega_p of precession, with the omega_s of spinning in the denominator.

But if we look at https://en.wikipedia.org/wiki/Nodal_precession

We get omega in the numerator (right after the J2).

Why do these have different dependencies? My understanding was that nodal precession IS a form of gyroscopic precession. Does anyone know the derivation for nodal precession?

Would also appreciate any suggestions to other subreddits to ask, this feels pretty technical compared to what I usually see around here.

submitted by /u/WaitForItTheMongols
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How do we know the age/lifespan of stars?

Posted: 05 Jul 2018 04:12 PM PDT

Was reading the wiki entry on open clusters after someone mentioned it elsewhere and came across this statement:

"Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years."

How is it that we know this even though couldn't have watched it play out and we don't have any physical access to them. What sort of dating process is used and how do we know it works?

submitted by /u/mman426
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How are each of the lobes in the brain differentiated on a biological level?

Posted: 05 Jul 2018 01:17 PM PDT

Certain areas have different functions, but how does that map to their individual clusters of neurons?

submitted by /u/spauldeagle
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Why are babies hands and feet purple or blueish when they're a newborn?

Posted: 05 Jul 2018 01:59 PM PDT

How do monarch butterflies find milkweed?

Posted: 05 Jul 2018 05:03 PM PDT

They fly thousands of miles... How are they able to track down a single milkweed plant in the middle of nothing else to lay their eggs?

submitted by /u/mandyvigilante
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vào lúc No comments:

Thursday, July 5, 2018

How are fire works engineered?

How are fire works engineered?

How are fire works engineered?

Posted: 04 Jul 2018 07:36 PM PDT

How does one figure out how the pattern will spread and time it accordingly. And use the right mixture to attain color?

submitted by /u/newhorizon56
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How do Virtual Machines handle Memory Caches?

Posted: 05 Jul 2018 07:17 AM PDT

Let's say I have a multicore processor with three cache levels. On it, there is a hypervisor with two virtual machines running.

As I understood it the hypervisor kind of pretends to be a computer with smaller memory to each VM.

I also know that a cache is a faster and smaller type of memory, like RAM relates to the harddrive, but a cache can't be explicitly targeted by an application programmer. Does an operating system programmer handle cache accesses? Or is the cache behavior determined by a even lower level, like directly in hardware?

If the OS on one VM wants to write to the cache, does it tell the hypervisor "Hey I want to write to this specific line/address of my own virtual cache!"? A "virtual cache" sounds weird, because indirection is slow and caches are supposed to be fast. Also, when multiple VMs each have a dedicated space in the cache, these spaces would be rather small.

Therefore, maybe the VM doesn't concern itself with caches and just tells the hypervisor on which vitual adresses it wants to read and write and lets the hypervisor decide when and where to access a cache.

Probably I have misunderstood something about operating systems and it works differently altogether.

The background to this question is that I'm reading the paper "Flush & Reload" by Yarom and Falkner from 2014. They explain that the cache opens a side-channel, where information can leak from one process to another. They write that this also works for cross-VM attacks. I want to have a clearer understanding on how the caches of two VMs on the same host interact.

I would be grateful for even some pointers.

submitted by /u/JohannesWurst
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Ask Anything Wednesday - Engineering, Mathematics, Computer Science

Posted: 04 Jul 2018 08:12 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
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What makes an object bendable?

Posted: 05 Jul 2018 07:46 AM PDT

What changes do interior facets make to an acoustic horn's sound?

Posted: 05 Jul 2018 07:17 AM PDT

I was looking at the Denman Exponential horn which is rectangular rather than circular and then I remembered that some gramophone horns have a faceted interior. What changes do these facets make to the sound?

submitted by /u/hypotune
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What is punctual prevalence? In the medical field I know what prevalence, point prevalence and lifetime prevalence is but I am coming across some articles citing punctual prevalence. What is the difference between these?

Posted: 05 Jul 2018 05:28 AM PDT

Do toxin effects stack, or are there diminishing returns at some point?

Posted: 05 Jul 2018 05:27 AM PDT

Depends on where it acts (liver, heart, cellular level) and a few other factors, I know, but (random example) let's assume we have a toxin 150mg of which are fatal after 10 hours without medical treatment, would using 450mg cut that down to 3ish or simply make those 10 suck way more symptom-wise?

submitted by /u/HirsutismTitties
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How is the regurgitation risk managed in emergency surgery?

Posted: 05 Jul 2018 05:02 AM PDT

When you have a general anaesthetic, you have to fast to reduce the risk of you vomiting and the potential to aspirate it. But if someone requires emergency surgery (car crash etc.), presumably they've eaten in the last 12 hours, so how is the vomiting risk managed?

submitted by /u/Skylarkien
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[[Physics]] What is the highest FPS (both captured and displayed) that can ever be achieved? What are the limiting factors?

Posted: 05 Jul 2018 03:19 AM PDT

What part of lightning does the thunder come from? Is it the bolt hitting the ground?

Posted: 04 Jul 2018 11:39 AM PDT

Paleontologists: How common is it for fossils to have significant marks caused by the excavation process?

Posted: 04 Jul 2018 11:55 AM PDT

Whenever I watch people digging it strikes me how easily fossils could be damaged. How do you know when to stop digging quickly and forcefully and start being more gentle?

submitted by /u/chubbygeodesic
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Can light be reflected exactly back onto it's original path in the opposite direction, and cancel itself out?

Posted: 04 Jul 2018 03:17 AM PDT

So if light is an EM wave, and just talking about the E-field here at a single point in space, then the E-field has one direction (traveling in line and not being redirected), though the E-field strength may vary over time.

If you reflect that same light back into that path, this means the E-field direction is opposite of original light, so is it possible to make the reflected light always have the same magnitude everywhere in that path as the original light to cancel everything out?

submitted by /u/yosimba2000
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Why does overdosing on pills cause Gastrointestinal bleeding?

Posted: 03 Jul 2018 08:46 PM PDT

How does Gastrointestinal bleeding work even?

Why is one of the major symptoms of overdosing on lets say Ibuprofen , or any other pills , Gastrointestinal bleeding , what do the pills do to cause that damage? As much info as possible would be appreciated :)

I dont know if this is an appropriate question , but I'm just really curious about it and I had no clue where else I could ask. :)

submitted by /u/NaziTookMyTurret
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Once it was feasible, how long did it take life to form on Earth?

Posted: 03 Jul 2018 07:55 PM PDT

While I can look up when the earliest evidence of life is, I've always wondered how long it took for life to form on Earth from the time it became possible.

So, at what point did the Earth have all the basics needed for life to arise? I'm thinking of the most obvious/common type of life -- whatever that might be -- rather than some unlikely form.

And then, at what point did it form? And on a universal scale of time, how quickly is that? I'm trying to get a sense of how likely life is based on how quickly it arose on Earth -- despite having only a single example of it happening.

submitted by /u/of_the
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Where does fat go when you burn it?

Posted: 03 Jul 2018 07:52 PM PDT
vào lúc No comments:

Wednesday, July 4, 2018

Is the nucleus of an atom a sea of quarks without clear boundaries between protons and neutrons?

Is the nucleus of an atom a sea of quarks without clear boundaries between protons and neutrons?

Is the nucleus of an atom a sea of quarks without clear boundaries between protons and neutrons?

Posted: 03 Jul 2018 10:39 AM PDT

I am aware of the quantum stuff that means we can't know exactly where the protons and neutrons are but that's not what I mean. Since both are made of quarks, ups and downs I think, are the quarks just all together in one big soup instead of being bonded to two others like in diagrams?

submitted by /u/DomPulse
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What does it actually mean if a quantity is an exact differential?

Posted: 04 Jul 2018 04:51 AM PDT

I came across this sentence: "since heat is not an exact differential it is not a property of the system. It is a path function."

So how can those things be inferred just by knowing that heat is not exact differential?

submitted by /u/quazarzzz
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Is there any dark matter in my room right now?

Posted: 03 Jul 2018 09:18 AM PDT

Do any non-human animals deliberately combine foods for eating simultaneously? Do any prepare meals with more than one ingredient?

Posted: 02 Jul 2018 01:08 PM PDT

How was the Apollo Command Module kept oriented so the lift force acted "upwards" with respect to the Earth?

Posted: 04 Jul 2018 12:46 AM PDT

I'd love to know how the pod was oriented correctly and stably with respect to the earth for re-entry. It had an offset center of mass and flew at an angle of attack of something like 20-26 degrees, flying a lifting re-entry. But to do that it had to be rotated the right way; if it rotated along its longditudinal axis, the lift would act sideways or downward, making it slam harder into the atmosphere.

From what I've been able to learn so far it's a "free body" in physical terms, so the offset center of mass does not naturally "fall" downward to orient the craft with the required angle.

It also seems like the crew were able to guide the pod by changing its rotation in flight, so the lift acted to divert the course left or right and in the process make the re-entry profile steeper or shallower.

Was the rotational orientation done entirely with reaction control thrusters? Or was there some inherent stability at work?

I know aerodynamic stability (center-of-mass in front of center-of-drag) keeps the heat shield pointed at the airflow, but what keeps the craft rolled the right way for a lifting re-entry?

submitted by /u/iiiinthecomputer
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UAE plans on towing icebergs from Antarctica for fresh-water supply. How feasible is this and what are the possible side effects?

Posted: 03 Jul 2018 09:34 AM PDT

Here's the link to the article.

I know the article already talks about some of the effects it will have on climate change in the UAE, but what are the other possible side effects (if any) of this, on the world, or areas around the planned route of towing. The impact it would have on Antarctica, etc. Anything that isn't mentioned on the article.

Edit: Here's a more recent article I found.

Here's the website for the project.

submitted by /u/Pmhp34ham
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Why is the speed of gravity limited to the speed of light?

Posted: 03 Jul 2018 01:53 PM PDT

I've been taught 4 things:

  1. The speed of light is the maximum speed that anything can travel through space
  2. Unlike light, gravity is not a force carried by particles traveling through space, it's caused by the distortion of spacetime itself
  3. The expansion of the universe can happen faster than the speed of light, because the maximum speed limit only applies to things moving through space, not space itself distorting
  4. Gravity/gravity waves travel at the speed of light

Number 4 doesn't seem to follow from the first three, can someone explain why gravity can't propagate faster than the speed of light? For example, I've heard it said that the earth doesn't orbit the Sun's current location, it orbits where the sun was 8 minutes ago. Why couldn't the curvature of spacetime be "updated" faster? Why can spacetime expand faster than light, but not bend faster than light?

submitted by /u/Gammapod
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Why can’t an electron’s original velocity be measured by comparing the energy loss of the photon used to detect its position with the energy loss used to detect the electron at a secondary position?

Posted: 03 Jul 2018 07:04 PM PDT

So I've been trying to delve into some more advanced physics than I had previously known and recently looked into the Heisenberg Uncertainty Principle. As I understand it, part of the problem with trying to measure an electron's position vs. its velocity is that the energy of the photon needed to measure each figure necessarily decreases the certainty of the other measure (ie. a high energy photon is more localized so the electron's position can be more accurately determined but the photon will impart so much energy that the electron's velocity will be greatly affected, and vice versa with a low energy photon).

My question is, if one were to hit the electron with a high energy (localized) photon, thereby more accurately determining its position, and then detect the photon after the collision, couldn't you measure the change in frequency to determine the energy transferred to the electron?

And then could you not attempt to measure the electron's position post-collision to determine where the electron travelled post-collision, and with what energy level, and then, taken with the energy loss from the original photon, use that to determine the original velocity of the electron prior to collision?

submitted by /u/epgenius
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Did satellite imagery help us discover anything new about the Earth's topography?

Posted: 03 Jul 2018 03:08 PM PDT

Were there any islands or ocean features we just didn't know about until we got into space or were our globes already basically accurate by that point?

submitted by /u/Ninjamin_King
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How can matter enter a black hole?

Posted: 03 Jul 2018 06:26 PM PDT

It's surely a stupid question because most of what I've learned is only vulgarised theory from YouTube videos.

So from what I've understood :

If we drop a clock in a black hole and observe it from distance, the time shown on the clock would slow down until it reaches the horizon, where it would freeze. So from the clock's perspective, the whole time of the external universe(?) would pass before it enters that black hole. I already have problems picturing that, because it would mean that no black hole could grow like we know they do. And if I add to it the fact that black holes aren't eternal (Hawking radiation..?) it seems that everything that would enter a black hole wouldn't do it before the hole actually evaporates.

Now I get that it is the relative time of the external universe that is being "sped up" but I picture the black hole as a part of the external universe as long as it is able to evaporate relatively to that reference. So what am I missing?

Edit : similiar question on stackexchange with no definitive answers so far : https://physics.stackexchange.com/questions/21319/how-can-anything-ever-fall-into-a-black-hole-as-seen-from-an-outside-observer

submitted by /u/iuopkizt
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Is there any research about mass distribution inside a black hole?

Posted: 03 Jul 2018 05:27 PM PDT

The simplistic view is that all mass is in the singularity at its center but this seems to me is in conflict with another view that says crossing the event horizon is imperceptible (for large black holes) AND an observer would be able to "see", just before they're turned into spaghetti, a highly accelerated history of the Universe unfolding above him, due to experiencing severe time acceleration as they approach the singularity.

Thus, mass within the black hole is not all in its center and there might even not be any singularity to speak of. It's just an immense bunch of stuff slowly travelling (as seen by an observer outside the horizon) towards a common center but only reaching it at the end of time (again, as seen by an outside observer).

So I'm wondering if anyone thought about an experiment to determine mass distribution inside the event horizon, as difficult as that may be.

submitted by /u/entmus
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How do the "small, rocky cores" of the gas giant planets maintain such huge atmospheres?

Posted: 03 Jul 2018 05:26 PM PDT

If I'm not mistaken, most of these cores are smaller than Earth and are made out of ice and rock? Why doesn't the Earth have such a huge atmosphere?

submitted by /u/_imhigh_
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What is life the scientists are finding?

Posted: 03 Jul 2018 08:34 PM PDT

We often hear, that, there may be 'life' on Europa, no 'life' in Venus or probably 'life' existed in Mars. What actually the scientists recognise as 'life' and how do they determine it? What are the parameters with which they filter 'organic' activity from any random chemical reaction?

submitted by /u/SVIKC
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Do electrons take up enough space to “bump” into eachother when sufficiently congested, or does the electromagnetic force keep them apart?

Posted: 03 Jul 2018 03:05 PM PDT

I've heard quite often around here that electrons are points, as in they are not a sphere or some classical image of that, and this is why it's hard to talk about their spin angular momentum in an intuitive way. But they can't be points right? (Since they have a mass and take up space). In the flow of electricity, I'm wondering if the electrons physically move eachother or if their electromagnetic interactions guide the flow. Thank you!

submitted by /u/liamguy165
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What specifically would an electromagnetic pulse break?

Posted: 03 Jul 2018 06:23 PM PDT

Whenever I search about EMPs, results fall in to a few categories. *tin foil hat preper folks *people who make money on Add revenue *people who watch too much TV

But never an actual engineer or physicist, and enough of those folks hang out here, thought I'd create a new search result on the subject.

What I can never find, is what specifically "frys" when exposed to an EMP? Do capacitors explode? Resistors melt? I'd imagine at the very basic level, the copper will not stop being copper, and mosy software could be restarted.

Wouldn't surge protectors, breakers sheilding and fuses do a lot of good in protecting electronics in most cases?

submitted by /u/Khakikadet
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Does Mercury experience any significant tidal forces from Sun?

Posted: 03 Jul 2018 10:51 AM PDT

Relativity: Speed vs Gravity?

Posted: 03 Jul 2018 01:07 PM PDT

Speed slows time to an observer. And lesser gravity speeds time to an observer. At what point does one effect overtake the other? In other words, GPS satellites must account for these: the speed of the satellite (slower time), and the lesser gravity due to being away from the surface of Earth (faster time). How do these compare in magnitude with a satellite's speed and position above Earth? And at what point does one overtake the other?

I wonder this with respect to geosynchronous satellites that are high above Earth; they move at a high speed with relation to the center of Earth but are akin in certain aspects to a tall building where higher floors have a faster flow of time to observers on the surface of Earth.

Can anyone explain how this works in geosynchronous, and nearby GPS satellites?

submitted by /u/ScoobyDoobyToo
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How are today's telescopes so powerful?

Posted: 03 Jul 2018 07:14 PM PDT

Electric and magnetic fields exist, and allow for photons. Gravitational and Gravitomagnetic fields exist. Do graviphotons (?) exist? Why/why not?

Posted: 03 Jul 2018 01:54 PM PDT

I just discovered maxwell's equation analogues for gravity, it's pretty cool

submitted by /u/FragmentOfBrilliance
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How is it possible for an isotope to increase in atomic number when it goes through beta-minus decay?

Posted: 03 Jul 2018 10:53 AM PDT
vào lúc No comments:

Tuesday, July 3, 2018

AskScience AMA Series: We are developing a multi-sensor robotic vehicle (named Ugo 1st) for humanitarian de-mining. Ask Us Anything!

AskScience AMA Series: We are developing a multi-sensor robotic vehicle (named Ugo 1st) for humanitarian de-mining. Ask Us Anything!

AskScience AMA Series: We are developing a multi-sensor robotic vehicle (named Ugo 1st) for humanitarian de-mining. Ask Us Anything!

Posted: 03 Jul 2018 04:00 AM PDT

Hi reddit! We are developing a multi-sensor robotic vehicle (named Ugo 1st) for humanitarian de-mining in the Eastern Ukraine conflict zone. You can read a bit about it here and see it in action!

Our system includes an impulse ground penetrating radar array (1Tx+4Rx) for rapid detection and precise localization of buried objects. Upon detection, the robot automatically halts, and a high-resolution holographic radar is deployed to record images that provide object ID and confident discrimination of mines from clutter (with high probability of detection, and low false alarm rate). Our system also include DGPS, and two real time, 3-D time-of-flight cameras to aid in navigation, and to provide additional visual detection/discrimination of exposed objects or disturbed earth. We are following the principles of Industry 4.0, with systems cooperating and communicating wirelessly under remote (often machine) control. Since we are building using primarily low-cost, commercial off-the-shelf, and 3-D printable parts, we envision not just one Ugo 1st, but a swarm of cyber-physical systems working together to clear vehicle-accessible areas when hostilities cease. Ugo 1st has performed scanning experiments in Firenze, Italy while under control of an operator in Rapperswil, Switzerland, with data processing and image analysis being performed in real time and simultaneously in Lancaster, Pennsylvania, and Kharkiv, Ukraine.

We'll be joining you at 3 PM Eastern Time (20 UT), ask us anything!

submitted by /u/AskScienceModerator
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How is the date of archeological sites estimated?

Posted: 03 Jul 2018 02:14 AM PDT

I'm interested in science behind dating Göbekli Tepe in particular, what guarantees that it is older than the pyramids and stonehenge for instance?

submitted by /u/noidea101
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Some modern computer programming languages compile into an intermediate language that is common among multiple languages (C#, VB.Net, Java). Could the same be done for human language instead of trying to convert directly from language to language?

Posted: 03 Jul 2018 05:56 AM PDT

Is there a point where something can’t get any louder - i.e. the loudest something can be on earth, or can something just keep getting louder?

Posted: 02 Jul 2018 10:00 AM PDT

If I stand on my lawn holding a mirror facing the sun, will any of the sun’s reflected light reach the surface of the sun?

Posted: 02 Jul 2018 09:52 AM PDT

Where does Brewster's angle come from? How is light polarized by reflection? How is light polarized by scattering?

Posted: 03 Jul 2018 05:39 AM PDT

A few questions here, but I haven't found a satisfactory answer anywhere. Firstly, I was not aware that light is both reflected and refracted on entering certain media, and an explanation for this would be great as well. Now I really just want to know how these methods provide polarization. How come light is polarized when it is reflected? Why would light be polarized when scattering? In-depth answers are allowed and appreciated. Thank you

submitted by /u/TheGoogolplex
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What's stopping planes from being built increasingly larger just by scaling up?

Posted: 02 Jul 2018 03:48 PM PDT

If I take the largest airliner in the world, and increase every single part of it to be 2x larger, will it still work? It has twice the weight, but but does it have wings that provide twice the lift, and engines that provide twice the thrust?

submitted by /u/Wyodaniel
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What things contribute the most to climate change and why?

Posted: 03 Jul 2018 03:17 AM PDT

Why are methanol and hexane flammable, while salicylamide and benzhydrol aren't?

Posted: 02 Jul 2018 11:18 AM PDT

I know that hydrocarbons are necessary for the reaction to take place, but I'm just confused as to what functional groups set these apart. Benzene is flammable, yet contain aromatic rings. What makes benzhydrol that much different from methanol? Thanks in advance.

submitted by /u/Qualmyst
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Is there any discernible structure in the cosmic microwave background noise?

Posted: 02 Jul 2018 09:37 AM PDT

Is their any material that allows light to travel only in one direction?

Posted: 02 Jul 2018 09:31 AM PDT

Like a diode allows electricity to travel in one direction any materials that can do the same for light?

If light comes from one side, it allows it to pass, from the other side, it reflects it back

submitted by /u/j2m1s
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Why is the gut sometimes considered part of the nervous system? What are/is gut flora and what do they do?

Posted: 01 Jul 2018 01:07 PM PDT

Why do some mosquito bites develop into a splotchy rash, while others stay a neat little bump?

Posted: 01 Jul 2018 12:41 PM PDT

They're both itchy, but the redness (and size of bumps) can vary wildly. Is the difference based on species, individual specimens, or just my own body reacting inconsistently?

submitted by /u/what-a-good-boy
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How do submarines obtain oxygen over long periods of being under water?

Posted: 01 Jul 2018 11:49 AM PDT

How do submarines hold or obtain oxygen during trips. I know pressure cause the air within the submarine to become more and more compressed, so what happens if the submarine runs out of oxygen for the crew?

submitted by /u/ChildOfBacon
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