An alien spaceship traveling at a constant velocity of 1/3 in the +X direction passes the earth (call this event A) at time t=0. Just as the spaceship passes, people on the earth launch a prove, which accelerates from res toward the spaceship (call this event B) when both are 10 minutes of distance from earth. As it passes the alien spaceship, the probe takes a photo and sends it back toward the earth as an encoded radio message that travels at the speed of light. the message reaches the earth at event c.

a) draw a quantitatively accurate space time diagram of this situation that clearly shows the worldlines of the earth, the alien spaceship, the probe, the returning radio message, and events A,B,c

b) when do the people on earth receive the photo.