>If we were looking to travel to a place that is 500,000 light years away, and could travel at the speed of light, it would take us 500,000 years to get there.
You are ignoring Einstein’s relativity. 500,000 years would pass on earth. No time, or very little time because the speed of light itself is unattainable, would pass on the spaceship. As observed by the spaceship, the distance to travel would shrink to near zero.
Huh? “Speed of light is unattainable”? “Distance to travel would shrink to near zero”? Also, you seem to ignore, it’s Einstein’s THEORY of relativity.