lmjoe t1_je9ni55 wrote on March 30, 2023 at 12:54 PM Reply to comment by paolog 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] If the speed of light can't slow down, why is it always referred to as "the speed of light in a vacuum" ? Permalink Parent 3
lmjoe t1_je9ni55 wrote
Reply to comment by paolog 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]
If the speed of light can't slow down, why is it always referred to as "the speed of light in a vacuum" ?