Two spaceships are moving away from Earth in opposite directions, one at 0.76c, and one at 0.62c (as viewed from Earth). How fast does each spaceship measure the other one going? The first spaceship heads to a planet 10 light years from Earth Observers on Earth thus see the trip taking 13.1579 years. How long do people aboard the first spaceship measure the trip? years

Two spaceships are moving away from Earth in opposite directions, one at 0.76c, and one at 0.62c (as viewed from Earth). How fast does each spaceship measure the other one going? The first spaceship heads to a planet 10 light years from Earth Observers on Earth thus see the trip taking 13.1579 years. How long do people aboard the first spaceship measure the trip? years