Suppose our sun is about to explode. in an effort to escape, we depart in a

spaceship at v = 0.80c and head toward the star tau ceti, 12 lightyears away.

when we reach the midpoint of our journey from the earth, we see our sun

explode and, unfortunately, at the same instant we see tau ceti explode as well.

a) in the spaceship’s frame of reference, should we conclude that the two

explosions occured simultaneously? if not, which occured first?

b) in a frame of refernece in ehich the sun and tauceti ar at rest, did they

explode simultaneously? if not, which exploded first?