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Jul 11, 2023 at 3:54 comment added Colin K It would indeed move arbitrarily quickly.
Aug 19, 2020 at 0:44 comment added Not_Einstein Re. the laser spot on the moon - suppose the laser is in a fixed position and the spot on the moon is stationary. Now I aim the laser toward a different spot on the moon arbitrarily quickly. Light has to leave the laser in the new direction and travel at speed c to get to the new target. The spot is not going to move arbitrarily quickly to the new position. So I don't get how this is an example of something (albeit non-material) moving > c.
Jan 8, 2017 at 11:58 history answered b_jonas CC BY-SA 3.0