In as simple a way as possible, how are we able to tell the elementary make up of a planet using only a telescope? |
- In as simple a way as possible, how are we able to tell the elementary make up of a planet using only a telescope?
- In T-S or P-V diagrams often there is a number with an s next to it e.g. (5s connected with dashed lines with 4). What is the meaning of that 5s point and what is different from the regular 5?
- Apparently, for Conservation of Energy to be true, time translation symmetry must hold. However, does it really hold in an expanding universe?
- They say that a photon takes a million years to make it out of the Sun. But what does it even mean? How do we define that a particular photon now is the "same" photon that was there then?
- When you squint really hard, why do you hear a rushing wind like sound?
- Can you tell a sunrise from a sunset just from looking at a photograph?
- As a star begins to die, what are the effects on orbiting planets before the supernova?
- If I yawn while listening to music, there is a significant noticeable increase in my perception of the speed of the music. Why is this?
- How do we get high frequency (of few GHz) in electronic circuits ?
- If you're constantly growing and shedding skin cells, how come your freckles don't disappear/you don't grow new freckles?
- Why will a RH- mother with a RH+ fetus will have issues, and not a RH- fetus and a RH+ mother?
- If I have a description of a time-symmetric continous system (say, a set of random differential equations or a cellular automaton or something), how exactly would I get a formula for the conserved quantity as per Noether's Theorem?
- Why isn't there a 50% chance for 3 flipped coins to all land on the same side?
- If it were possible to stably break an atom apart into its fundamental parts, could we hypothetically put the existing particles back together into new atoms?
- If I attempted to hang myself from the ceiling of an elevator using a belt and it began to free-fall ... would there be slack in the belt?
- Can you get better at working with less sleep by training/practicing? i.e. Is there any long term adaptation to chronic sleep restriction?
- [Quantum Mechanics] Don't wave functions that can't be normalized contradict the possibility of an infinite universe?
- Is it possible to be shocked by an organisms spinal cord?
- Could 90-proof (95% ABV) Ethanol dissolve plastic?
| Posted: 20 May 2017 05:19 AM PDT Just reading a story about how scientists used the Hubble telescope to view HAT-P-26b, s planet 440 light years away. They saw "distinct signatures of water in its atmosphere" and "found fewer heavy elements than they had expected". How can you do this using only a telescope? [link] [comments]  |
| Posted: 20 May 2017 04:53 AM PDT |
| Posted: 20 May 2017 12:49 AM PDT On a relevant note: if we ever find out that the symmetry does not hold, and you can generate infinite energy, would it also invalidate the law that entropy always increases, thus freeing us of the danger of Heat Death, a la The Last Question? [link] [comments]  |
| Posted: 20 May 2017 01:56 AM PDT When I'm doing photons-in-a-box problem with large enough number of photons, and I add a photon in, and later I let a photon out, there isn't really a sense in which I can say which one of the photons got out, any more that when I add 1+1=2, and then subtract 2-1=1, can I tell which one did I subtract (quite literally, this is how Fourier transform seems to work). They just blend into one wave until I decide to unblend them. I'm imagining the interior of the Sun to be a giant soup of photons, constantly absorbed, reemitted, bouncing around. Sometimes new photons are created by fusion, and sometimes some photons get out into the interstellar space, but how do we "track" them? [link] [comments]  |
| When you squint really hard, why do you hear a rushing wind like sound? Posted: 19 May 2017 03:44 PM PDT |
| Can you tell a sunrise from a sunset just from looking at a photograph? Posted: 19 May 2017 06:39 PM PDT |
| As a star begins to die, what are the effects on orbiting planets before the supernova? Posted: 19 May 2017 09:52 PM PDT Say an Earth-like planet (read: Earth) is orbiting a star of 1 solar mass that is nearing it's death. At what point does life on this planet cease to exist (read: no longer habitable)? What exactly happens to scour all possibilities of survival? Or would all be well and good until the supernova begins? [link] [comments]  |
| Posted: 19 May 2017 04:48 PM PDT This happens every time, regardless of how tired I am, I use headphones when I listen to music, if I'm moving my head to the beat or something, that keeps in time with the music and I perceive my movement as happening faster too. The increase is between about 20-50%, it varies but it's always a significant difference. [link] [comments]  |
| How do we get high frequency (of few GHz) in electronic circuits ? Posted: 19 May 2017 06:55 PM PDT I know about crystal oscillators, that can make frequencies up to 100 MHz and about PLLs, Schmitt-triggered inverters and stuff like that. But I couldn't find a good explanation and put this together to figure out where all does high freqs come from. I guessed it has to do with all the before mentioned concepts, so I would like to clear it out. [link] [comments]  |
| Posted: 20 May 2017 04:03 AM PDT So it's my (possibly inaccurate) understanding that freckles are a result of a certain cluster of cells producing more melanin and appearing darker than the rest of your skin cells. So wouldn't you eventually shed all the dark cells that composed a freckle, or new cells that you produced could mutate to be darker? As someone who has had the same trademark nose freckle all their life, I know this to be untrue, but why??? [link] [comments]  |
| Why will a RH- mother with a RH+ fetus will have issues, and not a RH- fetus and a RH+ mother? Posted: 19 May 2017 04:22 PM PDT Their blood mixes together, so can't the fetus create antibodies for the mother's foreign blood? [link] [comments]  |
| Posted: 19 May 2017 11:12 PM PDT |
| Why isn't there a 50% chance for 3 flipped coins to all land on the same side? Posted: 19 May 2017 05:01 PM PDT I know this might seem like a dumb question, but here's my logic; 'When you flip 3 coins, at least 2 of them are guaranteed to land on the same side, so surely the other coin has a 50% chance of landing on the same side as the other two.' Now, we can tell from flipping 3 coins several times, that this is probably an incorrect assumption. What I want know is, what is the error in my logic? [link] [comments]  |
| Posted: 19 May 2017 09:38 AM PDT For example, take Helium 4 with 2 protons and 2 neutrons. If we broke that apart into its individual components, could we piece it back together into 2 atoms of deuterium? [link] [comments]  |
| Posted: 19 May 2017 11:39 AM PDT |
| Posted: 19 May 2017 07:16 AM PDT Obviously, mental and physical performance will decline during the first few days of sleep restriction. Eventually, presumably after a few weeks, performance will cease to decline and stabilize at a minimum. The key question is: if you sustain this sleep restriction for a longer period of time (months to years), will performance ever increase above this minimum? and by how much? Is it possible to regain baseline performance if you limit sleep restriction to a small level? So for example, if you reduced your sleep time from a normal 8 hours to 7 hours for a period of a year, can you regain the same mental performance as before? If you go from 8 to 5 hours, can you perform as if you've only lost an hour of sleep? Effectively, you would be practicing working in a sleep deprived state, presumably adapting your mind and body in the hope of reducing or eliminating the effects of sleep restriction. [link] [comments]  |
| Posted: 19 May 2017 12:31 PM PDT The simplest case is a constant potential. We get that the wave function is proportional to exp[ikx] (and exp[-ikx]), so the square of its absolute value is constant, i.e. uniform distribution. But a uniform distribution is impossible in an infinite universe, as it can't be normalized. Doesn't that contradict an infinite universe? [link] [comments]  |
| Is it possible to be shocked by an organisms spinal cord? Posted: 19 May 2017 11:45 AM PDT I was talking to my dad earlier and he told me that one time he caught a catfish and gutted it, etc. Eventually, he grabbed its spinal cord and was shocked. I'm assuming this has everything to do with the nervous system of the fish but not exactly sure how it would shock my dad? [link] [comments]  |
| Could 90-proof (95% ABV) Ethanol dissolve plastic? Posted: 19 May 2017 10:25 PM PDT If so how long would it take to dissolve threw a plastic bottle? [link] [comments]  |
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