If Hailey’s comet loses ice to form its tail, how many years will it take for the comet to erode into nothing? |
- If Hailey’s comet loses ice to form its tail, how many years will it take for the comet to erode into nothing?
- AskScience AMA Series: We have 60+ years of experience with renewable energy & the energy transition. Ask us anything!
- When you look at a crescent moon it seems you can see the edge of the darkened portion. Are we really seeing an edge or is our brain just filling out the rest of the circle?
- Did the GOODS south image capture colliding galaxies?
- Why does melatonin cause hallucinations?
- Are there any examples of Binary Solar Systems (two separate star systems in extremely close proximity)?
- If the earth was hit by another large planetary body early in its life, why is our orbit still relatively circular?
- Does orbiting within a black holes ISCO require constant thrust or just additional energy?
- Would a space heater too small for the room use more energy than a heater that is big enough to heat the room or would it all end up the same?
- It has been told that utilization of Thorium for creation of nuclear weapons is quite hard, but why is it exactly hard to do so if we can utilize several materials to make it reach critical state?
- Did the Spanish flu (1918 influenza pandemic) also have variants?
- How does the trinucleotide repeat in Friedrich’s Ataxia cause altered expression of frataxin?
- Will lignin-eating bacteria foil our CO2 sequestration dreams?
- Are the distant planets that we can "see" still even there? How do we know?
- Are we going to need vaccine booster shots?
- How is Alzheimer's diagnosed?
- I wanna feel gravitational waves! Is that possible?
- How do the cells of complex organisms know which direction to grow in so that they get the desired shape on a macro level?
- How can bears live for months with no food or water while hibernating, how come humans can't do the same?
- How were maps drawn before planes?
| Posted: 14 Jun 2021 03:00 PM PDT |
| Posted: 15 Jun 2021 04:00 AM PDT "We" are part of REN21's team, a network made up of academia, NGOs, industry, govt and individuals who are supporting the world to transition to renewable energy. Today we released the Renewables 2021 Global Status Report so we're hosting an AMA to talk about renewables, energy, the future and everything in between. Multiple people from the team are joining including:
We'll be going live from 11am ET (15 UT), so ask us anything! Username: /u/ren21community [link] [comments]  |
| Posted: 14 Jun 2021 07:37 PM PDT |
| Did the GOODS south image capture colliding galaxies? Posted: 15 Jun 2021 05:05 AM PDT I was looking at the GOODS south image and noticed what looks to me like two galaxies on a collision course. Is this just an illusion in the image or a collision in progress/already done with? [link] [comments]  |
| Why does melatonin cause hallucinations? Posted: 15 Jun 2021 03:26 AM PDT I was reading about hallucinations and read that they are most reported as happening between 2-4 AM, the explanation being a peak in melatonin at this time. Why does melatonin cause visual hallucinations? [link] [comments]  |
| Posted: 14 Jun 2021 09:26 PM PDT I might be asking the wrong question or thinking about this in the wrong way, but the thought that I had is basically, what if there was another complete solar system just outside ours; a star with a number of planets, close enough that if both had an oort cloud, they would be basically touching. Have we found any examples of this? Can it possibly exist or would that be too close for two systems to develop alongside each other? Could there be enough movement within a galaxy for two systems to develop separately and then converge over a very long timescale? I'm also curious what difference that might make visually - would the star be close enough to appear meaningfully different to the naked eye compared to, for example, Jupiter or Mars? Could we potentially see the planets of the other system with the naked eye in the right conditions? Sorry for the vomit of questions, I'm very curious what the answers might be, and hopeful that they help frame my title question. [link] [comments]  |
| Posted: 15 Jun 2021 04:39 AM PDT If another large body crashed into us and ejected a bunch of debris that created the moon, shouldn't that have thrown our orbit out of whack, how come it's still relatively circular? [link] [comments]  |
| Does orbiting within a black holes ISCO require constant thrust or just additional energy? Posted: 15 Jun 2021 04:04 AM PDT I'm in a spaceship orbiting a blackhole at the ISCO. If I shrink my orbit below the ISCO. Can I just speed up faster to maintain orbit? I don't mean that trivially, I just mean if the speed of orbit is sqrt(GM/r) and spacetime geometry breaks down near a blackhole. Should one not also be able to orbit within the ISCO as long as you are going a bit faster than sqrt(GM/r)? So as you descend you have to keep supplying energy to increase your orbital speed. Obviously at some point you can't go any faster. But I don't see how once you pass below the ISCO (in a spaceship) you can't keep orbiting until you start reaching relativistic speeds. [link] [comments]  |
| Posted: 15 Jun 2021 01:26 AM PDT Heater A isn't powerful enough to heat up the room to the desired temperature. This means this heater will be constantly on trying to heat up the room but never getting there. Heater B is powerful enough to heat up the room to the desired temperature. This means it'll reach the desired temperature and then stop until it gets cold again. But because it's more powerful it'll consume more energy when it's on. Which heater would end up using more energy? [link] [comments]  |
| Posted: 15 Jun 2021 02:31 AM PDT |
| Did the Spanish flu (1918 influenza pandemic) also have variants? Posted: 14 Jun 2021 08:50 AM PDT |
| How does the trinucleotide repeat in Friedrich’s Ataxia cause altered expression of frataxin? Posted: 14 Jun 2021 04:56 PM PDT Hi, Very specific question, but I've been looking into Friedrich's Ataxia. It's my understanding that the GAA trinucleotide sequence is repeated in intron 1 abnormally, but my question is how exactly that repeat causes altered gene expression. One source says abnormal methylation, other papers say triplexes and r-loops and I guess I'm just kind of confused as to what the truth is, if we know at all. Does anyone know the specifics of this very niche question? Thanks in advance. :) [link] [comments]  |
| Will lignin-eating bacteria foil our CO2 sequestration dreams? Posted: 15 Jun 2021 12:04 AM PDT The world will soon choke on CO2. Its levels have hit a peak not seen for many an epoch. Part of the "solution" is to plant trees. This will suck up carbon. Given that the coal and oil we burn was laid down at a time that Lignin-eating bacteria did not exist, how are we (humans) going to reverse the CO2 problem we've created? As I understand it, modern plants/trees will never turn into coal, nor their residues into oil. It is converted into mostly methane and other deterioration-gasses and a little carbon. Is there a "real" solution to our self-made crisis? [link] [comments]  |
| Are the distant planets that we can "see" still even there? How do we know? Posted: 14 Jun 2021 12:03 PM PDT I've been watching some docs and doc series about astronomy and my (for one) takeaway has been that the distant planets (as in another solar system) aren't really seen, it's the light that has reflected off of them that we see (much later in time). How do we know that those planets aren't just dust today (in that they haven't been smashed to bits by something (rogue planet? a la Melancholia lol) in the time it's taken for the light has become detected)? Also, I've come to see those powerful telescopes (Hubble, etc) as not so much viewing devices (like binoculars) but the closest thing we have to time machines (due to the extreme distance/time). Am I on the right track? If not, please illuminate. Thanks! [link] [comments]  |
| Are we going to need vaccine booster shots? Posted: 14 Jun 2021 08:02 AM PDT |
| Posted: 14 Jun 2021 07:56 AM PDT Might sound like an obvious topic here so let me explain the question better. From what I've read Alzheimer's is diagnosed by exclusion of options rather than specific tests. MRIs and CT scans are done but rather to exclude other causes, not to determine Alzheimer's disease. In advanced stages the diagnosis might be obvious, but in earlier stages if other causes are excluded how does a doctor diagnose Alzheimer's as opposed to just age/stress/fatigue or other mental states/etc? [link] [comments]  |
| I wanna feel gravitational waves! Is that possible? Posted: 14 Jun 2021 07:59 AM PDT I saw this Veritasium video on how we detect gravitational waves. And it got me thinking, can we feel gravitational waves? If not practically then atleast hypothetically? Like if everything was perfect and not considering the probability of it. [link] [comments]  |
| Posted: 13 Jun 2021 07:10 PM PDT I was thinking about this while looking at a plant. I was wondering from where in the plant do the cells multiply to make it grow. But more interestingly, how do they know to multiply in a line stretching upwards and outwards along the stem rather than into a random blob of cells. Then I started wondering the same about animals too; how do organs know to get into that shape? [link] [comments]  |
| Posted: 13 Jun 2021 07:19 PM PDT Like if someone just spent the entire day in bed after having lots of food they would be thirsty and hungry within a day, how can bears do that? [link] [comments]  |
| How were maps drawn before planes? Posted: 13 Jun 2021 05:23 PM PDT |
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