askscience

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What does the gravity well of an atom look like on a subatomic level? Does each subatomic particle have its own distinguishable gravity well and how steep, for lack of a better word, is the sides of those gravity wells?	54
I just found out that while mars has about 1/10th the mass of earth it has 38% of the gravity. This suggests a non-linear relationship between mass and gravity at the surface. What causes this effect? [Physics]	17
Ancient seeds has occasionally successfully been grown to revive plant species that have long been extinct. But have anyone ever managed to pollinate modern flowers using ancient preserved pollen?	2
I recently learned that a large number of very small black holes might have been created around the big bang. This raises the question; how small can a black hole theoretically be? Could it for example be small enough to pass through atoms?	1
Let's say we some day establish radio contact with an alien civilization in another solar system, obviously there would be a delay on the radio signals on the order of decades or centuries. But never mind the ping, what kind of band with could we establish?	1
Could there theoretically exist a subatomic particle so dense that it would collapse on itself and become a singularity?	1
NASA's OSIRIS mission found that the asteroid Bennu consists of loose material clumped together by gravity. Would that behave like a liquid? Could you float on it? Sail in it?	1
What happens to the background radiation from the universe as it enters a black hole? Does time dilation cause an observer to receive exponentially increasing doses of background radiation as the observer gets closer and closer to the event horizon?	1
What happens to electromagnetic radiation when it red-shifts further and further? Is there a theoretical limit to how large the wave length can become?	1

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