Answering Questions about Higher Dimensions, Magnetic Poles & Mercury's Core

What happens when two black holes' event horizons overlap? Neil deGrasse Tyson and co-host Chuck Nice answer fan questions about the north side of the magnet, the internal structure of other planets, dark matter, and more. Kicking things off with a question about mapping the universe using gravitational waves, Neil explains how LIGO helped detect them and how pulsars might one day let us track their movement across space.

Courtesy of StarTalk on YouTube. Watch on YouTube ↗

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