AskScience AMA Series: Happy World Octopus Day! I'm a marine biologist who raised a day octopus in my home for a PBS Nature documentary called "Octopus: Making Contact." Ask me anything! |
- AskScience AMA Series: Happy World Octopus Day! I'm a marine biologist who raised a day octopus in my home for a PBS Nature documentary called "Octopus: Making Contact." Ask me anything!
- How do X-rays penetrate materials?
- Would blowing a meteor up as it enters atmosphere lessen the damage to Earth?
- Is there a possibility antiphotons exist?
- Where are we in the current Milankovitch cycle? And when would the next ice age be (if there was no human cause climate change)?
- When I was young I was told that when rinsing with mouthwash containing alcohol (listerene for example) That the burning meant it was working. Is that true? If not, why does it stop burning after the first few seconds?
- How much acceleration is required for uniform circular motion with relativistic velocity?
- Does Nutation or Precession Affect the Rheology and/or Magnetic Field of Our Planet?
- Is there a uniform measure of time that is not dependent on Earth?
- Planets clear their orbits of debris (or they're not called planets). So why don't SMBHs clear their galaxies of dark matter?
| Posted: 08 Oct 2019 04:00 AM PDT Hi, I'm David Scheel, a professor of marine biology at Alaska Pacific University. I've studied octopuses for more than 20 years and recently raised a day octopus in my living room for a documentary. The octopus was named Heidi, and she came to recognize me and my daughter and would play with toys and display other remarkable signs of intelligence. I also caught her changing colors while sleeping, you may have seen this clip. If you haven't yet watched "Octopus: Making Contact," you can stream it at https://to.pbs.org/2Oj3ApV (US viewers only) It also aired on the BBC under the title "The Octopus in My House." I'll see you all at 12 noon ET (16 UT), ask me anything! [link] [comments]  |
| How do X-rays penetrate materials? Posted: 08 Oct 2019 05:59 AM PDT Hello, My understanding is that the lower the frequency, the longer the range. Ergo, radio waves can travel long and far despite obstacles in their way and high frequency visible light can't navigate obstacles. Given that X-rays have higher frequency than visible light, how is it that they can travel through metal objects as well? Do X-rays not scatter according to Rayleigh's law? [link] [comments]  |
| Would blowing a meteor up as it enters atmosphere lessen the damage to Earth? Posted: 08 Oct 2019 12:58 AM PDT |
| Is there a possibility antiphotons exist? Posted: 08 Oct 2019 05:03 AM PDT |
| Posted: 07 Oct 2019 10:02 PM PDT |
| Posted: 07 Oct 2019 03:58 PM PDT |
| How much acceleration is required for uniform circular motion with relativistic velocity? Posted: 07 Oct 2019 08:34 PM PDT For example, you have a ship travelling in a circular "orbit" with unit radius around empty space, with constant inward acceleration (of 1g, 10g... arbitrarily high). How does the acceleration required increase as the velocity increases up towards the speed of light? [link] [comments]  |
| Does Nutation or Precession Affect the Rheology and/or Magnetic Field of Our Planet? Posted: 07 Oct 2019 08:40 PM PDT Okay, this is my first post here so I should say that I am not an academic, I'm just a rather erudite and curious scientific civilian This is something that has been poking at me for a while and I haven't been able to find any clear answers in the papers I've read. Do the various nutations in the Earth's axis affect the rheologic flow in the mantle and thereby affect the magnetic field over time? Also could there be a 'tipping point' where the movement/flow of the mantle is misaligned with the rotational axis of the earth, causing the spin axis to shift? Is was just doing some abstract thinking on the subject playing with spinning water in a glass and had to stop and look up the words that describe the concepts I'm asking about. I have been trying to construct a model in my mind but I'll admit that I don't have a hold on even most of the pieces in play. I usually learn best through discourse so any direction or discussion would be awesome. Thanks [link] [comments]  |
| Is there a uniform measure of time that is not dependent on Earth? Posted: 07 Oct 2019 06:36 AM PDT I was watching The Expanse and a comment was made by some people who were from the Asteroid Belt, when talking about their age: "Even our Time comes from [Earth]?" It got me thinking, I know time is relative, but still, is there a uniform measure of time that is not dependent on Earth? One that can be measured and leveraged ubiquitously anywhere in space? [link] [comments]  |
| Posted: 07 Oct 2019 12:09 PM PDT Whatever DM is, it interacts with gravity so there should at all times be a steady stream of DM falling past the SMBH's event horizon and on to the singularity, never to emerge except via Hawking radiation in the far future. Many galaxies are disc-shaped but their DM tends to exist in a (more) spherical globule surrounding the galactic center (GC), according to artist's impressions of DM distribution, which are of course based on whatever the physics is that's being illustrated. I have to assume those images are accurate depictions. So if those images are showing globules of DM surrounding GCs, why are those globs of DM still there? Why doesn't the SMBH "vacuum" it all up within a few million years, or whatever relatively short time scale? Tell me if this is wrong: DM exists in elliptical orbits around GCs. But those orbital paths would be distorted by other stars near the SMBH, causing some of the DM to be accelerated into the SMBC on a steady basis until there was none left outside the EH. But it seems that doesn't happen. What's really going on? It seems that the still unknown exact nature of DM wouldn't affect the problem as I've stated it. [link] [comments]  |
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