More from Stephen Hawking, Einstein, and the astrophysics of space, along with lots of Recpeptacle callers who are just floating out there with nothing to do, and more space-related songs than usual. The early misconception of a Universe filled with “ether” is described as being the medium throughout space, which facilitates the operation of everything from light to gravity. Now we know better, or do we?

3 Hours.

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