How do colorblind people perceive lasers at the wavelengths they cannot see? |
- How do colorblind people perceive lasers at the wavelengths they cannot see?
- How old is the snow on top of Mt Everest?
- Has Earth had a bigger mountain than Mount Everest?
- During pair production does the photon just split into a particle and antiparticle or is the photon fired at something?
- How Responsible is the Decay of Radioactive Elements for the Brightness of a Supernova?
- If the moon is tidally locked to Earth, how are there craters on the side facing Earth?
- The Voyager pulsar map not only marks where the Earth is located, but when the Voyager probe was launched. How did we calculate this?
- When the James Web telescope is launched, how much greater detail of other galaxies, or other stars should we expect to see?
- How big does a meteor need to become a meteorite?
- What is the process through which charged particles deform magnetic fields?
- Why does copper sulphate crystallize in a parallelogram-like shape?
- Why do worms go on top of concrete when it rains?
- How and why does the brain reuptake serotonin?
- Information in Regards to the Pāli Language?
- Is there any singularity-free gravitational soliton? That is, is there an asymptotically (but not thoroughly) flat, static, nonsingular vacuum solution of General Relativity?
- Does water dry quicker depending on temperature?
- What is the difference between BDNF & NGF?
| How do colorblind people perceive lasers at the wavelengths they cannot see? Posted: 13 Apr 2019 02:05 AM PDT |
| How old is the snow on top of Mt Everest? Posted: 12 Apr 2019 11:24 AM PDT Saw an r/Showerthoughts post earlier that talked about the snow on top of Mt Everest. This got me thinking about the lifespan of snow. Living where I do, the Pacific North West, I think of snow as a fleeting thing, tied to a season. Lasting a few days at most. I think of how delicate snowflakes seem and imagine they can't last too long out in the wild. But then this... Somewhere relatively undisturbed with weather conditions that suit, how long can a snowflake last? Does it just remain in that form indefinitely? Is there any way at all to tell how old snow is? [link] [comments]  |
| Has Earth had a bigger mountain than Mount Everest? Posted: 12 Apr 2019 05:59 PM PDT because of how Earth is constantly changing due to the crusts moving my question is has there ever been a taller mountain than mount everest that shrunk or just doesn't exist anymore? [link] [comments]  |
| Posted: 13 Apr 2019 04:18 AM PDT Google isn't clear and my textbook just says "In pair production a photon creates a particle and a corresponding antiparticle and vanishes in the process" [link] [comments]  |
| How Responsible is the Decay of Radioactive Elements for the Brightness of a Supernova? Posted: 12 Apr 2019 03:02 PM PDT It always seemed really clear that supernovas were bright because they were so hot and energetic, (releasing as they do more power in a few minutes as the sun will in its whole life.) However, I recently read (in "The Magic Furnace" by Marcus Chown) that this might not be the whole story. In the 1930s, a supernova in Galaxy IC4812 was observed whose brightness cut in half every 55 days, similar to the pattern of a radioactive element with a half-life of 55 days. This led Geoffrey Burbidge to suggest that the fade of this supernovas brightness was due to the presence of recently created californium-254 (which has a 60 day half-life) decaying in the expanding shell of shock-wave. (This was apparently later corrected and while the general idea is claimed to be correct, now scientists believe that the decaying light owes more to radioactive nickel-56 (half life of 6 days) and cobalt-56 (half life of 77 days) created during the supernova mimicking a single isotope with a half life of 60 days.) My question is, how much of a supernova's brightness comes from traditional, 'I'd expect this from a giant explosion' sources, like heat from compression, friction, etc, and how much comes from this radioactive decay? Thanks! [link] [comments]  |
| If the moon is tidally locked to Earth, how are there craters on the side facing Earth? Posted: 12 Apr 2019 12:51 PM PDT |
| Posted: 12 Apr 2019 09:01 AM PDT Pulsars make fantastic beacons because they are incredibly reliable on their pulse timing and because they can be markers not only for where in the universe something is but also when it was there. The Voyager pulsar map shows where Earth was located when the probe was launched, but how did we calculate this? I would assume that at the time you could easily look at where the Earth is in relation to the pulsars at that moment* and just use that, but what if I wanted to make a map like that for a time long ago or long in the future? *Did the designers of the map actually have to do more calculations than I'm postulating because the time delay in light travel skewing the relational positions? Or did they just wing it and say "that's where we see the pulsars are in relation to us factoring in delayed light, the aliens can figure that out"? Disclosure: while I am actually very interested in hearing the answer to this, I have to admit I also have the selfish intentions of getting a Voyager pulsar map tattoo that shows where the Earth was in both time and space on my birthday. [link] [comments]  |
| Posted: 12 Apr 2019 11:15 AM PDT |
| How big does a meteor need to become a meteorite? Posted: 12 Apr 2019 12:35 PM PDT So my question is this, how big does a meteor need to be to be able to survive the transfer from outer space through our atmosphere and impact earth to the point its of notable size like the Gibeon landfall? I understand the make up of said meteor would make a difference in its resistance to breaking down as it burns through the atmosphere. [link] [comments]  |
| What is the process through which charged particles deform magnetic fields? Posted: 12 Apr 2019 06:50 PM PDT I understand that the solar wind will deformed and break the Earth's magnetic field lines. I was wondering what the process is that causes this. I would also like to know what exactly the field lines are. [link] [comments]  |
| Why does copper sulphate crystallize in a parallelogram-like shape? Posted: 12 Apr 2019 09:26 AM PDT |
| Why do worms go on top of concrete when it rains? Posted: 12 Apr 2019 07:35 AM PDT |
| How and why does the brain reuptake serotonin? Posted: 12 Apr 2019 12:45 PM PDT |
| Information in Regards to the Pāli Language? Posted: 12 Apr 2019 12:34 PM PDT Hello members of Askscience! I have a few questions about the ancient Pāli Language that I just can't seem to find any good resources which touch on them. I understand very little about this language. I know as much that it's the liturgical language of Theravada Buddhism, but I do not know much about it in terms of historical relevance and Linguistics. I am looking for any information regarding the Pāli Language but most specifically:
Any information regarding the Pāli Language is greatly appreciated, but it might be easier to compare it to other ancient languages of the time. I imagine Sanskrit and Pāli share many features and vocabulary, but this could be a sign of my lack of knowledge. [link] [comments]  |
| Posted: 12 Apr 2019 12:10 PM PDT I've heard that if you replace "static" with "spherically symmetric" in the above question and ignore "singularity-free", then by Birkhoff's theorem the only such spacetime is Schwarzschild. I wonder is there a similar theorem/result that says the following: "the only static, asymptotically flat, (non-coordinate-)singularity-free metric is Minkowski flat space"? [link] [comments]  |
| Does water dry quicker depending on temperature? Posted: 12 Apr 2019 05:17 PM PDT For example say I spilt hot water on a jumper and cold water on another jumper which one would dry faster? Would it be the cold water one because the hot water needs to cool down first? Sorry if this sounds really dumb. I have no idea what science this is- psychics maybe? [link] [comments]  |
| What is the difference between BDNF & NGF? Posted: 12 Apr 2019 11:14 AM PDT |
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