An alien spaceship traveling at0.640 c toward the Earth launches a landing craft. The landing craft travels in the same direction with a speed of0.810 c relative to the mother ship. As measured on the Earth, the spaceship is0.210ly from the Earth when the landing craft is launched. The Earth-based observers measure the speed for the approaching landing craft to be0.955 c. The distance to the Earth at the moment of the landing craft's launch as measured by the aliensis0.161ly. Thetravel time required for the landing craft to reach the Earth as measured by the aliens on the mother ship is0.111ly.
The questions with answers are below.I need to understand the process to get the answers.
(a) What travel time is required for the landing craft to reach the Earth as measured by Earth-based observers?

(b) What travel time is required for the landing craft to reach the Earth as measured by those on the landing craft?

Answer rating: 100% (QA)

a Since we know the distance from Earth to the spaceship as seen from Earths reference frame 0210 ly ... View the full answer