Question

Suppose a suitably advanced alien civilization sends a ship on a trip to Earth. The ship travels at 0.01 of the speed of light, and the total travel distance to the Earth is 50,000 light-years. How many years will it take the aliens to reach Earth? (Ignore time spent speeding up or slowing down, and any relativistic effects.) Number years World Space Ship This image shows a Bernal Sphere, a space habitat that could be adapted to make a world space ship. The habitat rotates to simulate gravity and is completely self sufficient. Many generations of the inhabitants would pass as the ship travels among the stars. For more information about this image, go to Resources: Help With This Topic. (NASA Ames Research Center / Rick Guidice)

Answer 1

Total time taken by the aliens to reach the earth is, x=vt 11 0.010 50000Ly( " Year) 0.010 = 50,00,000 years or 5x100 years