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

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Photons are said not to experience time. Does this still hold true when they are slowed through a medium? How?

682 upvotes

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Do black holes have an escape velocity?

9 upvotes

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How do photons carry information about objects from which they are emitted or off of which they have reflected?

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Could a plane fly on a planet with no atmosphere?

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Why does air escape my bicycle inner tube so much faster than my car's tires?

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New Horizons reached Jupiter in 13 months, and then took another 8 years to reach Pluto. Is Pluto really that far? Or is something else in play?

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Traveling faster than light sends you backwards in time, but gravitons also travel at the speed of light, so what effect does FTL travel have on gravity?

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When I see something happen before I hear it, no problem. Why is it an issue if I were to see something happen before it actually happened? Why does the speed of light determine causality?

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Are gravitons/gravitational waves affected by gravity? Do they follow the curvature of spacetime?

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Since dark matter is able to interact gravitationally, are there dark matter black holes?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Photons are said not to experience time. Does this still hold true when they are slowed through a medium? How?	682
Do black holes have an escape velocity?	9
How do photons carry information about objects from which they are emitted or off of which they have reflected?	7
Could a plane fly on a planet with no atmosphere?	2
Why does air escape my bicycle inner tube so much faster than my car's tires?	1
New Horizons reached Jupiter in 13 months, and then took another 8 years to reach Pluto. Is Pluto really that far? Or is something else in play?	1
Traveling faster than light sends you backwards in time, but gravitons also travel at the speed of light, so what effect does FTL travel have on gravity?	1
When I see something happen before I hear it, no problem. Why is it an issue if I were to see something happen before it actually happened? Why does the speed of light determine causality?	1
Are gravitons/gravitational waves affected by gravity? Do they follow the curvature of spacetime?	1
Since dark matter is able to interact gravitationally, are there dark matter black holes?	1