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

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According to an outside observer, does a beam of light shined directly at a black hole ever cross the event horizon?

15 upvotes

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When people talk about the "temperature of the universe" being ~2.7 K, does this mean that if you were to evenly distribute all particles throughout the universe now, the average temp everywhere would be 2.7 K?

14 upvotes

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Are virtual particles really just popping into and out of existence all around us? Do they really need no energy to arise?

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Followup to a previous question: Are there any instances when we put in physically meaningful numbers into the maths of a theory and get out something deemed "impossible"?

13 upvotes

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What does it mean when people say a particle is an excitation of a field? And does that field physically "exist" in any way apart from its associated particles?

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Special relativity question that I can't resolve (diagram included)

12 upvotes

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How soon after eating carbs can the body use them for energy? And how big is the window that they can be used for?

11 upvotes

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If someone were sitting dead-center in the Earth-Moon system's L2, would they be able to see any of the Earth? Or would it all be blocked out from their field of view by the moon?

10 upvotes

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How do we know what we should expect for the angular sizes of spots in the CMB under different geometries of the universe?

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Does our atmosphere act at all like a glass lens, giving us a "fish-eye" view of the night sky?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
According to an outside observer, does a beam of light shined directly at a black hole ever cross the event horizon?	15
When people talk about the "temperature of the universe" being ~2.7 K, does this mean that if you were to evenly distribute all particles throughout the universe now, the average temp everywhere would be 2.7 K?	14
Are virtual particles really just popping into and out of existence all around us? Do they really need no energy to arise?	14
Followup to a previous question: Are there any instances when we put in physically meaningful numbers into the maths of a theory and get out something deemed "impossible"?	13
What does it mean when people say a particle is an excitation of a field? And does that field physically "exist" in any way apart from its associated particles?	13
Special relativity question that I can't resolve (diagram included)	12
How soon after eating carbs can the body use them for energy? And how big is the window that they can be used for?	11
If someone were sitting dead-center in the Earth-Moon system's L2, would they be able to see any of the Earth? Or would it all be blocked out from their field of view by the moon?	10
How do we know what we should expect for the angular sizes of spots in the CMB under different geometries of the universe?	10
Does our atmosphere act at all like a glass lens, giving us a "fish-eye" view of the night sky?	10