In article ,
Muerte wrote:

Sorry if I'm asking in the wrong place.

I was having a conversation with my son (13) last night about time being
perceived as slowing as the speed you travelled increased. He then asked if
we were totally still (as in not on the Earth travelling around the sun
travelling around the Milky Way travelling through the universe) what would
happen in regards to our perception of time.

If we were able to travel at such a speed (hypothetically, obviously, so no
arguments that we can't please, even though I appreciate that it's true) that
allowed us to perceive that we've travelled for 1 year in a round trip, but
when we returned 2 million years had passed, if we were totally still would
time begin and end for us simultaneously or would it become infinite and
would we experience a sort of immortality?

Any answers would be greatly appreciated.

If you are talking about relativistic time dilation, no matter what
speed others think you are traveling, you won't (can't) notice anything
odd at all about your own situation. You will notice odd things about
the folks you are going past, though.

"Space and Time in Special Relativity" by N. David Mermin, is a very
accessible entry into the subject. A bright 13-year-old shouldn't have
too much trouble with most of it.

Isaac