06 Gravity Bubble: Aberration of light

How aberration of light tells us which twin is traveling in the Twin Paradox.
Search "The curvature of light due to relativistic aberration" if you want to learn more.

[fede_ponz]

0:30 thanks, more clear than my astronomy professor

[pjcamp]

This argument is based on the assumption that there is a "correct" view of the sky and it is the one the stay at home twin sees. That isn't true. What is correct is what you see. So the traveling twin would say that his view is correct, and since the stay at home twin is moving, aberration causes the stars concentrated on one side to be spread out evenly. Consequently, you cannot use this argument to claim that one twin is really moving and the other is not. By saying "motion is only relative to space, " you are essentially resurrecting the idea of an ether that is at absolute rest, against which all other motions can be measured. Space is not a thing. You can't move relative to it. Space is the arena through which physical objects can move. The "relative" part of "relativity" refers to objects in motion relative to other objects.

[Nitephall]

Motion is only relative to space?? I think not. Space is not absolute, as Newton thought. Space is defined as the positions of objects relative to each other. Motion exists only as a relation to other objects. The only thing that is not relative is the speed of light.

[wrj]

How about an light source of lase on earth, is the the aberration of light still happen to observer on earth? if not why not?