If you were to design a spacecraft that could travel to the galactic center fast enough that the astronauts aboard only aged by 25 years during the trip, how fast would the spacecraft have to go? The galactic center is 25,000 light years away.
A) 0.95c
B) 0.995c
C) 0.99995c
D) 0.9999995c
E) 0.999999995c

Question

Quizplus · Accepted Answer

To achieve significant time dilation where only 25 years pass for the astronauts while traveling 25,000 light years, the spacecraft must travel at a speed extremely close to the speed of light. At 0.9999995c, time dilation is sufficient for the astronauts to age only 25 years.

If You Were to Design a Spacecraft That Could Travel