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There is - believe it or not - a loophole that could show give solid evidence that Ragnarok happened. It involves a black hole (or a very massive body). One of the coolest effects of general relat...
This is my favorite question in a while, so I hope it's okay if I bend a slight rule in order to answer it. The question explicitly says "likely", so chances are my answer is completely invalid. I ...
Ahh, here we go. No. But yes. I'll leave the stuff about the Roche limit for Vincent; after all, it was his idea. Assuming he writes up an answer, you'll learn why these planets cannot be tidally...
It would be brilliant. 30% oxygen atmosphere would mean that our human bodies have more available oxygen and would take more in in a single breath; this means that we would be able to respire faste...
Denver has about 17% less oxygen than at sea level. Note that this isn't reduced concentration; there's just less air. This answer doesn't address the increased proportion of other elements in th...
Probably not. A direct quote from here would be nice, but I'm not sure if there's any relevant copyright on the text, so I'll just summarize. Here are the steps to forming a contact binary star sy...
This method would work, almost without doubt, on humans. There would always be some doubt in their minds as to whether the universe was real, so they would probably not kill everything. Probably. ...
A city planet Take Coruscant, from Star Wars. It's a planet covered entirely by one large, sprawling, complex city. I'm not sure if there's a canonical reference to how high the tallest buildings ...
You wrote I'm thinking for instance that the next post-human pulse for instance would have a lot less coal and oil. That's it. You hit the nail on the head. Each re-generation is inheriting ...
Planets can die, but it either takes a lot of energy and effort, or is very boring. Boring Planets can just stop working. As stated by some other answers here, if a planet has no life on it and i...
tl;dr: It can't be done. Meteors and all the various different classifications of them (meteorites, meteoroids) are small. The sun is big. More importantly, the sun is hot. If a meteor is heading ...
No. At the moment, I can't answer the part about the shape of the core. I can answer the part about the magnetic field. The Earth rotates, and because of that its shape is that of an oblate spher...
Here's some information about Venus: Surface gravity: $8.87 \text{ m/s}^2$ Surface temperature: $737 \text{ K}$ Surface pressure: $\approx$ $92 \text{ atm}$ So no liquid water on the surface. ...
I'm really having trouble here. Let me outline my thinking: The First AI This is my major problem. If the first shackling AI is weaker than the next, which is weaker than the next, and so on, the...
1.Can fly to the altitudes of modern airliners (around 10 000 meters or 32808 ft). Take a look at this graph: At 10,000 meters, the air pressure is about 25% of its value at sea level. Wiki...
tl;dr: Not without killing everything. Let's do some maths and actually figure this out. The specific heat capacity of water is $4.186 \text{ kJkg}^{-1}$. That means it takes 4186 joules of energ...
Air is incredibly light. It's hard to conceive of any materials that are actually lighter than air and sufficiently so to keep lift while under load. However, it might be possible to use balloons ...
Why would they live on a planet? These robots, with sufficiently advanced AI, could have a pretty advanced social system. They could have community leaders, followers, criminals even (if the progr...
Stick yourself in a rock and hope for the best. That's literally the best approach. It's a bit more elegant than that sentence might make you think, but it's something. I'll tell it like a story....
The orbit you describe is typical for (moderately) long-period comets. Given the desired orbital period, we can calculate the semi-major axis of the orbit (which, for a highly elliptical orbit lik...
Blue supergiants are massive. Really, really massive - up to dozens of times the mass of the Sun. They are also extremely hot, large and luminous. They live much shorter lives that stars like the S...
Actually, the strength of the field would change at the planet's surface. If we model the field as a dipole, it is described by the equations $$B_r = -B_0 \left(\frac{R_E}{r} \right)^3 \cos \theta$...
Problem 1: Food This is the major contributing factor to the size of the biosphere. Humans need to consume around 2,250 calories per day (averaged between men and women) to sustain themselves, and...
Earth's magnetic field is caused by movements in its core. Its outer core is roughly $2,890,000 \text{ meters}$ below Earth's surface. Therefore, to directly interfere with Earth's magnetic field, ...
When people think of supernovae, they often only think about the visible light emitted during and after the explosion. However, if you restrict yourself to observing in the optical part of the elec...
