/u/CockroachED's posts in /r/askscience

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The Moon is spiraling away from Earth at an average rate of 3.8 cm per year, so when it was formed it would have been much closer to Earth. Does it follow that tides would have been greater earlier in Earth's history? If so how large?

1116 upvotes

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Is the phenonemon of "childhood imaginary friends" present in all human cultures?

326 upvotes

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The mass of most very large stars are only in the range of 10-100 solar masses but the radius is on a scale of 100-1000 solar radii. What is the "surface" like on these stars, is it extremely less dense than are Sun or do these stars have a different internal structure to maintain surface density?

226 upvotes

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If no evidence for the Higgs Boson is discovered soonish, what will become the new dominant model for particle physics / which alternative model is the next easiest to test?

33 upvotes

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What is the closest blackhole (stellar or larger) to Earth?

13 upvotes

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What are the chances that humanity could survive a nuclear war?

7 upvotes

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What research has there been into the ability of animals besides humans to hallucinate?

5 upvotes

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If we can observe galaxies in ever direction we look, how do we know the shape of the universe is flat and not a sphere?

3 upvotes

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What happens to veins leading from an amputated limb? Does having a drastically reduced source of blood cause the veins to shrink in size?

2 upvotes

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What would be my ionizing radiation exposure on the surface of Venus or Titan?

2 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
The Moon is spiraling away from Earth at an average rate of 3.8 cm per year, so when it was formed it would have been much closer to Earth. Does it follow that tides would have been greater earlier in Earth's history? If so how large?	1116
Is the phenonemon of "childhood imaginary friends" present in all human cultures?	326
The mass of most very large stars are only in the range of 10-100 solar masses but the radius is on a scale of 100-1000 solar radii. What is the "surface" like on these stars, is it extremely less dense than are Sun or do these stars have a different internal structure to maintain surface density?	226
If no evidence for the Higgs Boson is discovered soonish, what will become the new dominant model for particle physics / which alternative model is the next easiest to test?	33
What is the closest blackhole (stellar or larger) to Earth?	13
What are the chances that humanity could survive a nuclear war?	7
What research has there been into the ability of animals besides humans to hallucinate?	5
If we can observe galaxies in ever direction we look, how do we know the shape of the universe is flat and not a sphere?	3
What happens to veins leading from an amputated limb? Does having a drastically reduced source of blood cause the veins to shrink in size?	2
What would be my ionizing radiation exposure on the surface of Venus or Titan?	2