if you are traveling very fast, the clocks of others are speeding up from your point of view.
This is backwards. Everyone in an inertial frame thinks other peoples clocks are slower. Acceleration is what causes the opposite, e.g. turning the spaceship around to come back
You're right that Cowen got it backwards, but you're wrong about this:
Acceleration is what causes the opposite, e.g. turning the spaceship around to come back
Acceleration is not the cause. The reason the astronauts age less is that the path they follow through space-time corresponds to a smaller proper time than the path followed by people who remain on the Earth, and the proper time along a path is what a clock following that path measures. So it's a geometrical fact about the difference between the two paths that causes the asymmetrical aging, not th...
Another month has passed and here is a new rationality quotes thread. The usual rules are: