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Q&A: Measuring a Black Hole’s Spin and more. Featuring Andy Weir Author of the Martian

Q&A: Measuring a Black Hole’s Spin and more. Featuring Andy Weir Author of the Martian

In this week’s question show, Fraser explains how astronomers measure the spin rate of black holes, other uses of gravitational slingshots, and why everyone is talking about Patreon.

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