HUH???
Hey there, Doc!
Methinks you need to check your math......
Wait he is using CBO numbers
No that is true. Time dilation is responsible for that effect.
In fact, it would only take 30 human years to get to the opposite site of the universe, if the ship could allow for ever increasing speed, yet never need to be at the speed of light once done.
However, the Earth would have passed away hundreds of millions of years earlier. Odd, huh?
Real time for them might be ten years, while back on Earth, 50,000 years would pass.
Maybe it's ten years in ship time, since the ship is traveling at relativistic speeds and time would appear to slow down for them. From our perspective back on earth, it would take them 50,002 years if they could accelerate instantly to near light speed.
...time compression. To passengers, it would be 10 years. To the rest of the universe, and all the folks back home, it would, indeed, be 50,000 years. The effect of compression actually makes the distance shrink.
The passengers themselves don't seem to be exceeding the speed of light. If they shine a light beam out the front of the mighty ENTERPRISE, the beam would leave them behind at...the speed of light.
It's one case where everything actually is "RELATIVE". That's why it's called "relativity". TANSTAAFL.
Time dilation on the ship close to the speed of light would make only ten years pass for the crew.
That would be 10 years on board the spacecraft, ~60,000 years for the rest of us watching it go.