[Q&A] End of Expansion of the Universe, Hypervelocity Stars, Retrograde Planets

Do we predictions when will the Universe stop its expansion? Did we find hypervelocity stars in M31? What does it mean when planets go retrograde? And in Q&A+ could the Big Bang be a white hole?

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00:00 Start

00:27 [Peter Keyson] When will the Universe stop expanding?

02:54 [John De Keizer] Hypervelocity stars in M31

06:20 [kindness] What does it mean that planets are retrograde?

08:31 [J E] Are we working on strategies to mitigate the effect of satellites?

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