Thread: Tell me about Relativity

Originally Posted by TimeStopper

I always wondered this problem. If there one galaxy to the left of us moving away at 80% lightspeed, and another one to the exact right of us also moving at 80% lightspeed. What would the speed of the left galaxy see for the speed of the right galaxy?

it would be moving away very slow, i think

the theory, i think it's relativity goes like this, basically:

if you travel near the speed of light, time seems to slow down
if you travel exactly at speed of light, time seems to stop
if you travel faster than the speed of light, time seems to reverse

but einstein said traveling at faster than light is impossible because the mass at those speeds would become infinite

EDIT: now that i think about it, it'd probably look like it's moving away from each other at light speed, you wouldn't be able to visually see it after a while

They would see it moving away from them at 96% the speed of light because time is moving at 60% of an outside observer. However, they would also see the galaxy going away from them as 60% closer than an outside observer.