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 The Amazing Expanding, Accelerating Universe

Audio Lectures by: Neta A. Bahcall and Wendy Freedman  

In this 1999 conversation from the Science Friday archives, astrophysicists Neta Bahcall and Wendy Freedman explain the then-revelation that the universe’s expansion is accelerating, not decelerating.

Ever woundered how big the largest known star is

This video gives some idea of just how large they are.