1. The problem statement, all variables and given/known data Suppose our sun is about to explode and we escape in a spaceship toward the star Tau Ceti. When we reach the midpoint of our journey, which takes place at v=.83 C we see our sun explode and, unfortunately, we see Tau Ceti explode as well (we observe the light arriving from each explosion. (there's a part a and b but i understand those parts, so i'll go straight to c and d) c)In the spaceship frame of reference, how long before we saw the Sun explode did it actually explode? (enter a positive value for times in the past.) d) In the spaceship frame of reference, how long before we saw Tau Ceta explode did it actually explode? 2. Relevant equations Δt = [itex]\gamma[/itex](Δt' - v/c2Δx') } S'-->S 3. The attempt at a solution c) I have worked out an answer using the equation I gave but I'm not sure if its correct. I said that S is my frame for the spaceship and S' is my frame for the sun. Δt = [itex]\gamma[/itex](Δt' - v/c2Δx') so Δt = 1/(sqrt(1-(.83c)2/c2))*((6 years)+(.83c*6c)/c2) Δt=19.686 years Δt' = 6 years So it actually exploded 13.686 years ago? for part d), i used the same equation but instead used -v so Δt = 1/(sqrt√(1-(-.83c)2/c2))*((6 years)+(-.83c*6c)/c2) = 1.823 years so it actually happened 1.823-6 = -4.171 4 years into the future? This is the main reason why I'm not believing my answer.