Hi, Please consider: At time zero a spaceship takes off from earth and keeps traveling under constant acceleration. From earth's perspective, the spaceship's speed keeps increasing but never reaches c. Also from earth's perspective, the clock on the spaceship keeps slowing down and asymtotes a certain time value (let's call tMax). However, from spaceship's perspective, their clock has not slowed down and passes tMax. They can take a photograph of their clock showing greater values than tMax, and return to earth. It can be arranged that in the background of this photograph there is evidence that it was taken before the spaceship turned around. How will observers on earth explain this photograph? Thanks in advance.