It's unfortunate you're getting downvoted, because this is correct. For anyone that is dubious: Black holes are one of the common ways this gets discussed, bec

It's unfortunate you're getting downvoted, because this is correct. For anyone that is dubious: Black holes are one of the common ways this gets discussed, because it's such an extreme example, and you can read more about it at http://www1.phys.vt.edu/~jhs/faq/blackholes.html#q11 http://www1.phys.vt.edu/~jhs/faq/blackholes.html#q11 - this goes into a bit about photons and the event horizon - you can ignore that and just consider it in regards to the time dilation effects of gravity.