One of the questions I get asked a lot is how fast does the International Space Station travel around the Earth? Here’s how to figure this out (hint: it’s a lot like the one we did previously with Jupiter and Callisto!)

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Finding the Mass of the Earth Now let’s estimate the mass of the Earth. You already know what it is (because we’ve been using it a lot in our previous calculations), so let’s pretend we don’t know and figure out first-hand.

Click here to go to next lesson on Halley’s Comet.

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