969: Delta-P - explain xkcd

Explain xkcd is a wiki dedicated to explaining the webcomic xkcd. Go figure.

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Visualization of the velocities required to escape these solar system bodies : r/educationalgifs

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Supermassive Black Holes 9781108488051, 9781108768849

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Supermassive Black Holes 9781108488051, 9781108768849

969: Delta-P - explain xkcd

Derived From XKCD: October 2011