a space ship goes from earth to planet x.
then it goes to the moon of planet x.when it reaches the moon it detects a energy pulse
and 1.01 seconds later planet x blows up.
the distance between planet x and its moon is 400 million meters
the speed of the space ship relatively to planet x and its moon is 0.980c.

A.what is the time difference between detecting the signal and the blowing of planet x
B.what is the meaning of the time difference
C.did the pulse made the planet to blow up or its other wise "

the question is inside the photo

http://i48.tinypic.com/vo5169.jpg

if look from the perspective of the space ship
why in the given table in the first post after time t its (x_0+vt,t)
(the ship moved x_0+vt)

if we always look from the perspective of our ship then the space ship
shouldnt move at all
it should be (0,t)

all the surroundings should change arround it

why we have x_0+vt ???

if we look from the perspective of the ship
??