Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #278154 | Initial revision | — | about 4 years ago |
| Question | — |
Didn't get notified about reply to comment Some time ago, I wrote a comment to this question. I don't remember the details, but something in the question needed to be fixed. I downvoted and left a comment saying I'd undo the downvote when the issue was fixed. Apparently it was fixed shortly after, but I never got notified. I stumbled up... (more) |
— | about 4 years ago |
| Comment | Post #277102 |
@aCVn: Yes, I should have been more clear. Obviously stars can be that close if they will eventually merge. However, that will decay quickly. That means conditions were drastically different recently, and will be different again shortly. Such rapid changes are not good for starting life. (more) |
— | about 4 years ago |
| Edit | Post #277414 |
Post edited: |
— | about 4 years ago |
| Edit | Post #277414 |
Post edited: |
— | about 4 years ago |
| Edit | Post #277414 | Initial revision | — | over 4 years ago |
| Answer | — |
A: How do I realistically keep my large mammalian predator hidden from other pack hunters. What you are asking for is unrealistic. 3000 kg is huge. That's over four times the mass of a typical rhinoceros, for example. Being really large like that lets it bully its way to some other animal's kill. Even as a carcass scavenger, it will be very tough to find enough carcasses or others' k... (more) |
— | over 4 years ago |
| Comment | Post #276352 |
@Pasty: I was also including the efficiency of using the result, not just producing the high-energy chemical with photosynthesis. In other words, overall efficiency of running the metabolism and working the muscles, divided by the total incident sunlight required to achieve that. (more) |
— | over 4 years ago |
| Comment | Post #277084 |
*" If I remove any specifics, that would confuse everything and stray everyone from the question."* Exactly the opposite. Discussion is already straying from the question due to all the irrelevant information, and because it's not obeying physics. Stating something with high precision implies that... (more) |
— | over 4 years ago |
| Comment | Post #277124 |
Actually, they have been tested. I've seen a video of a frog being held in a magnetic field strong enough to keep it suspended in air without touching any object. (more) |
— | over 4 years ago |
| Comment | Post #277102 |
@Enf: If any planet orbits two stars at 109 million miles, then the two stars must be absurdly close together. The distance between the stars must be a small fraction of this orbit radius, else a single orbit radius is meaningless. Let's say 10% to pick something. So the two stars are 11 million m... (more) |
— | over 4 years ago |
| Edit | Post #277102 | Initial revision | — | over 4 years ago |
| Answer | — |
A: How to Terraform a Dead Earth Your question makes no sense due to its disregard of basic science. The atmosphere consists primarily of carbon dioxide and methane So did the early Earth's, and life was able to start here. This is clearly not a problem for some types of life. Shallow seas cover 40% of the oceans That's... (more) |
— | over 4 years ago |
| Comment | Post #277084 |
What makes you say cyanobacteria can't live there now? You've got liquid water on the surface, so there must be places with appropriate temperatures. And there must be rain, so fresh water somewhere, making the acidity of the oceans irrelevant. (more) |
— | over 4 years ago |
| Comment | Post #276696 |
This seems to be missing the point. It's not about pressure felt by the second ship, but about colliding with all those particles at relativistic speeds. A good ion drive would send very small amounts of material out the back at very high speeds, the closer to the speed of light, the better. (more) |
— | over 4 years ago |
| Comment | Post #276503 |
You don't need this to be a full sphere to determine efficiency. The same would be true of a 1 square meter thermal panel in space receiving about 1.3 kW from the sun on one side and facing cold space on the other. (more) |
— | over 4 years ago |
| Edit | Post #276352 | Initial revision | — | over 4 years ago |
| Answer | — |
A: Competently Mobile Photosynthetic Animal? No matter what mechanism your animal uses for running its systems from sunlight, you still have the fundamental limitation of sunlight power per area (insolation). Solar insolation at earth's distance is 1367 W/m2. About 30% of that gets reflected back into space by the upper atmosphere. That le... (more) |
— | over 4 years ago |
| Comment | Post #262927 |
This question really should be closed until it is cleaned up. Currently it is too confusing and annoying to read. (more) |
— | over 4 years ago |
| Comment | Post #261471 |
I'm only now actually thinking about the numbers. Light travels 30 km in 100 µs in vacuum. Certainly sound propagation in any medium can't be faster than that. Are neutron stars really that small, and the speed of sound a reasonable fraction of the speed of light? (more) |
— | over 4 years ago |
| Comment | Post #261471 |
*for most people, milliseconds are a more familiar quantity than microseconds*. I find that hard to believe. (more) |
— | over 4 years ago |
| Comment | Post #261471 |
Note that a "tenth of a millisecond" is 100 µs. So why not just write that? (more) |
— | over 4 years ago |
| Comment | Post #273256 |
Your numbers are inconsistent. You estimate the required surface area is achieved by a sphere 22 meters in diameter. Then you say seawater contains 20% less oxygen, but requires a sphere 49 meters in diameter. That's 2.23 times the diameter, and 5.0 times the surface area to compensate for 80% of ... (more) |
— | over 4 years ago |
| Edit | Post #275883 | Initial revision | — | over 4 years ago |
| Answer | — |
A: Black as color of magic a type of light we could perceive as black because our eyes ... do not That's anything in the EM spectrum other than visible light. So exclude roughly 400 to 750 nm wavelengths. Infrared and ultraviolet are obvious choices, being on either side of the visible spectrum. eyes and brain ... do n... (more) |
— | over 4 years ago |
| Edit | Post #275882 | Initial revision | — | over 4 years ago |
| Answer | — |
A: What conditions would cause an extremely dense (dark) coniferous forest to grow? Nature does this on its own, given enough time. Different tree species have evolved different strategies. Some require a lot of sun, grow fast, and make a lot of seeds before being overshadowed by taller trees. Others have evolved to tolerate shade, usually in return for being less competitive whe... (more) |
— | over 4 years ago |
| Edit | Post #275841 | Initial revision | — | over 4 years ago |
| Answer | — |
A: Renaming Researched Q&A This isn't "my" site, so I don't really care what you do. Take this as an observation from a bystander. It seems to me you're trying to put a rather fine point on two broad classes of questions. It's not clear what problem you're trying to solve by dividing the site into ordinary questions and r... (more) |
— | over 4 years ago |
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