faster than light 154

Assuming the distance was not too much shorter than a mile, and that "about a thirtieth of a second is the minimum time interval distinguishable by the unaided eye", Boyer notes that Galileo's experiment could at best be said to have established a lower limit of about 60 miles per second for the velocity of light. But it is only possible to send information with such a wave packet at the group velocity the velocity of the blob , so the phase velocity is yet another example of a speed faster than light that cannot carry a message. When Einstein wrote down his postulates for special relativity, he did not include the statement that you cannot travel faster than light. It starts with two Missile weapons which is a problem since you have ammo limits on your offense then. The riddle of gravitation.

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