"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