- AskScienceAMASeries: Hi Reddit! We’re NOAA scientists Jamison Smith and Ed Lyman. In celebration of #WhaleWeek and World Whale Day on Saturday, February 18, we’re here to talk about the whales we protect and the entanglement response teams that risk their safety to rescue them. Ask us anything!
- Is gravitational acceleration on earth an exact value, or does it have a standard deviation from experiments that tried to measure it?
- Galaxies are said to mostly have black holes in the center. Have we observed any without them? And if so what object is center that has the mass needed to form one without being a black hole?
- If we assigned a 3 digit number to letters a-z, plus punctuation and space, then mapped that onto pi or e, would we get a "monkey's writing shakespeare" effect?
- I don't understand band theory. How come the density of states at the Fermi level determines if a material is a conductor or not?
- If a woolly mammoth or at least something very much akin to a woolly mammoth were "resurrected" or otherwise created where would it's "natural" range be on today's Earth? Also, what plants would/could it eat there?
- Is there another type of electromagnetic radiation past gamma radiation?
- Why do we call the final form of an insect an imago?
- Are black holes all thought to be homogeneous internally, or is it possible for a large enough collection of massive objects in a small enough space sufficient to create an event horizon?
- What are the differences between the modern Windows filesystem and the modern Unix filesystem? Where did those differences come from?
- Has surface of the Earth always been covered to 71% by water?
- Would jumping in this situation help?
- Does colour affect emissivity of an object?
- Are stars getting smaller?
- What are serotonergic psychedelics such as LSD and DMT doing to the brain?
- How do stars get 'eaten' by black holes? Why don't they just orbit?
- During the last glacial maximum when people crossed over the Bering Strait, were there any other significant geographical differences due to the different sea level around the world?
- How can scientists calculate Lagrange points between two objects when there are more than two gravitational forces acting on the point?
- Why does yellow exist on the light spectrum but not pink?
- Would Bill Nye's warming demo work?
- Why do falling rain and blowing snow tend to create channels about 5-10cm across?
- Why is n-type semiconductors net charge neutral though it has large number of electrons? Same with p-type semiconductors, it's net charge is also neutral though it has large number of holes?
| Posted: 17 Feb 2017 04:16 AM PST Hi Reddit! I'm NOAA Fisheries scientist Jamison Smith. I am the NOAA Fisheries National Entanglement Response Program Coordinator and I oversee NOAA's whale entanglement response teams. And I'm Ed Lyman, I serve as the large whale entanglement response coordinator for Hawaiian Islands Humpback Whale National Marine Sanctuary. Whales are becoming entangled in fishing gear and marine debris at an increasing rate and scientists are unsure why. Scar studies in U.S. waters show that 83 percent of all right whales and 70 percent of whales overall have been entangled in fishing gear or other marine debris at some point in their lives. Fortunately, the efforts of whale entanglement response teams are paying off. There are endangered North Atlantic right whales alive and reproducing today because of successful disentanglement efforts of NOAA Fisheries and our partners. Whale entanglement response teams must be available at a moment's notice and they deal with a variety of cetacean species, from the largest to the smallest, in a range of different ocean and weather conditions. These teams are highly skilled and use specialized equipment to cut whales free from tangled lines, buoys, and other debris. They can also administer on-site medical care to treat wounds and promote continued recovery. If you're interested in whales and the people who spend their lives saving them, this is your chance to learn more. We're here from 1:00 to 3:00 p.m. ET today to answer your questions. Ask us anything! [link] [comments]  |
| Posted: 16 Feb 2017 07:31 PM PST |
| Posted: 16 Feb 2017 07:19 PM PST It seems to me nothing would have the mass to form a galaxy without being a black hole. My google-fu isn't bringing up any known galaxies that have something such as a hypergiant in the center. [link] [comments]  |
| Posted: 16 Feb 2017 07:57 PM PST Also, at what point would computing power make this more viable than scientific research to understand the universe? [link] [comments]  |
| Posted: 16 Feb 2017 07:10 PM PST Every intro level textbook has some version of this picture: https://en.wikipedia.org/wiki/Electronic_band_structure#/media/File:Band_filling_diagram.svg . Then, there is always some handwaving about how the density of states determines if it is possible to excite electrons, and that whether or not electrons can be excited determines whether or not the material conducts electricity. I'm stuck on the "possible to excite electrons" implies "material is a conductor" step. I think the reason is that people usually talk about the classical theory of conductivity, i.e. the Drude model, and I can't imagine what the quantum version of the theory of conductivity would look like. How does the wavefunction electron in a metal look compared to one in an insulator? Also, what about indium tin oxide? How does that work? [link] [comments]  |
| Posted: 16 Feb 2017 07:38 AM PST |
| Is there another type of electromagnetic radiation past gamma radiation? Posted: 16 Feb 2017 12:44 PM PST Is there anything with a shorter wavelength than gamma radiation? [link] [comments]  |
| Why do we call the final form of an insect an imago? Posted: 16 Feb 2017 05:14 PM PST I am familiar with the meanings of the word in Latin, and I can generate some plausible answers. But better than an informed guess would be if somebody can tell us what actually was the thinking that did lead people to assign that particular term to the entomological concept. [link] [comments]  |
| Posted: 16 Feb 2017 10:48 AM PST I have a layman's understanding of physics and astronomical phenomena, so please forgive me if this question is absurd. However, it occurred to me that it might be possible for enough material- such as suns and so forth- to be in such close proximity that their collective gravitation creates a black hole to outside observers, even though it isn't really a single blob of matter- but for all intents and purposes it would still appear that way to outside observers. I guess my question is- is this possible, or is it something that would be rendered impossible by the requirements for how dense a mass must be to create an even horizon? Thanks! [link] [comments]  |
| Posted: 16 Feb 2017 11:28 AM PST In a computer science course I'm in, we covered that Unix file systems use a logical filesystem on top of the physical file system. I understand a bit, but it can get a bit confusing. As I understand it, the logical file system sometimes allows for smaller file sizes (via File Holes) and allows for easier mounting of seperate drives and devices, as they all become effectively just a part of the overall filesystem tree. I think I'd just understand this stuff a lot better if someone here explained it to me though, so thanks for any help. :) [link] [comments]  |
| Has surface of the Earth always been covered to 71% by water? Posted: 16 Feb 2017 05:51 PM PST So I saw that news about a newfound continent, and was wondering, has dry land on surface always been only 29% of its surface? I'm not sure even if there is a way to find that out. For example, the ancient continent Pangaea. It was consisted out of all continents that exist today, and thus how do we know that percent here and there hasn't been lost (or gained) since then through all the tectonic movement? And no, I don't consider that super ancient period of Earth in which water existed only in form of steam. So, lets start the countdown since planet "cooled a bit". I won't apologize for my English, it's not my native language. [link] [comments]  |
| Would jumping in this situation help? Posted: 16 Feb 2017 05:53 PM PST Let's say you're standing on a platform at the side of a tall building (like a window washer) and let's say you fall. Before you reach the ground you kick off the platform that you're standing on going vertically will this reduce the impact upon hitting the ground. May be a stupid question but i'm curious. Thanks in advance [link] [comments]  |
| Does colour affect emissivity of an object? Posted: 16 Feb 2017 12:45 PM PST Not sure if I'm using emissivity correctly, but I guess my question is If I have two similar objects A being coloured white and B coloured black would the colour of the object affect how well it absorbs radiation? I'm not speaking about light based like the sun, but purely just heat [link] [comments]  |
| Posted: 16 Feb 2017 01:45 PM PST Correct me if I am wrong, but stars are born in a nebula, which are the remnants of a supernova? If multiple stars are born in nebulae like in the pillars of creation, then surely an individual star will never be as massive as its parent star? [link] [comments]  |
| What are serotonergic psychedelics such as LSD and DMT doing to the brain? Posted: 16 Feb 2017 09:18 AM PST Serotonergic psychedelics bind to serotonin receptors (among others), eliciting their effects primarily through 5HT2A agonism. My question is, what is happening beyond these compounds binding to receptors? How do these receptors normally influence the behavior of individual neurons when bound to by serotonin, and how does this activity differ when LSD or DMT are binding to these receptors? What does LSD do that serotonin doesn't? How are these compounds able to induce their subjective effects? [link] [comments]  |
| How do stars get 'eaten' by black holes? Why don't they just orbit? Posted: 16 Feb 2017 12:36 PM PST I've seen lots of images like this one: But, why would the star spiral inward? Why wouldn't it just orbit or maybe create a ring around the black hole? It seems like the pieces getting 'eaten' are losing kinetic energy somehow, but I don't see why that's happening. [link] [comments]  |
| Posted: 16 Feb 2017 11:21 AM PST |
| Posted: 16 Feb 2017 08:02 PM PST For example, how can scientists calculate the Earth-moon Lagrange points using only the earth and moon even though the sun also has a gravitational pull on the points? [link] [comments]  |
| Why does yellow exist on the light spectrum but not pink? Posted: 16 Feb 2017 07:15 AM PST Just read an article about how pink does not exist on the light spectrum, but our brain creates it to signify that it's "not green" Here is the link: Pink does not exist. In essence it's saying that we only have red, green, and blue cones in our eyes, and when your red and blue cones fire but not green, your brain in a way "creates" purple. However, we also can't "detect" yellow. It appears when our red and green cones fire. Yet for some reason we call yellow "real" because it appears on the light spectrum. However, that doesn't make any sense to me, all that means to me is that the wave length between blue and green fires both my blue and green cones. For all I know the "yellow" section is just a mix of green and blue light. In other words, why does yellow exist if we can't even detect it, but pink doesn't just because it's not on the spectrum? Seems like they are doing the same thing to me. [link] [comments]  |
| Would Bill Nye's warming demo work? Posted: 16 Feb 2017 11:38 AM PST Bill Nye has a great short video talking about the concept of global warming. At 50s in, or so, he starts a demonstration of global warming with two jars. The odd thing, to me, is that glass absorbs most IR radiation; the additional absorption of CO2, I would think, would be minimal. But I am not sure. Has anyone tried this? I'm curious if it would work as well as they present, or if (as I would suspect) the additional CO2 would absorb a relatively small amount of heat compared to the glass. [link] [comments]  |
| Why do falling rain and blowing snow tend to create channels about 5-10cm across? Posted: 16 Feb 2017 02:42 PM PST When I see rain fall it tends to be clustered into channels about 5-10cm across. When I see snow blowing it tends to do the same, and I can see that the channels are in the same direction as the as the wind. My best guess is that the precipitation creates a drag on the moving air and it moves into the higher velocity channels that push the precipitation into the slower channels. The high velocity channels would be like the streams of water down a window, and the channels of precipitation would be the spaces between the streams. Is this related to the sand ripples that are created orthogonal to the motion of the water? Would snow more precisely be called 'precipitate' rather than 'precipitation'? [link] [comments]  |
| Posted: 16 Feb 2017 08:11 AM PST |
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