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At an origin there is an observer (A) who fires a laser at a series of beacons in a straight line spaced 186,000 miles (1 light second) apart each.
At the same time as the laser is fired, a second observer (B) starts traveling on a path perpendicular to that of the laser, stopping and returning along the same path so that they return to the origin. B travels at such a speed so that there is a 4 to 1 time dilation for the total time of his journey.
When B returns to the origin, A's clock sees 4 seconds have passed, B's clock sees 1 second passed. What is the resulting state of the beacons for both observers?
As I understand it, the result should be that:
A sees 4 beacons have been hit by the laser.
B sees 1 beacon has been hit by the laser.
How does SR explain that when B returns 4 beacons have been hit?
At the same time as the laser is fired, a second observer (B) starts traveling on a path perpendicular to that of the laser, stopping and returning along the same path so that they return to the origin. B travels at such a speed so that there is a 4 to 1 time dilation for the total time of his journey.
When B returns to the origin, A's clock sees 4 seconds have passed, B's clock sees 1 second passed. What is the resulting state of the beacons for both observers?
As I understand it, the result should be that:
A sees 4 beacons have been hit by the laser.
B sees 1 beacon has been hit by the laser.
How does SR explain that when B returns 4 beacons have been hit?