paolog
paolog t1_je9n938 wrote
Reply to ELI5: Why can black holes cause light to not escape, but light doesn't slow down from gravity(and only change direction)? by [deleted]
- The speed of light is constant, so light can't slow down.
- Black holes (and other massive objects) bend the space around them, so the path of a passing object (or light) bends as the object goes through that space. That doesn't slow the object or light down - it only changes its trajectory.
paolog t1_ixumwqq wrote
Reply to comment by Lupercali in TIL that in 1939 Ernest Vincent Wright wrote and published a 50,000 word novel, 'Gadsby' which does not contain the letter 'e' . A warehouse containing most copies of the book burned down. by Lupercali
The literal translation would be "The Disappearance"* (three e's), but I think they renamed it "A Void".
The point of the book was that "e" is the most common letter in French, making it hard to write, and in various other languages too, making it hard to translate. ("The" is one of the most common words in the English language.)
* Ironic, considering the fate of the book.
paolog t1_je9rfco wrote
Reply to comment by lmjoe in ELI5: Why can black holes cause light to not escape, but light doesn't slow down from gravity(and only change direction)? by [deleted]
The speed of light through any one medium (air, glass, a vacuum) is constant, so that is what is meant even we say "the speed of light is constant".