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Published: Sept. 20, 2017, 3:39 a.m.

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This week we talk about rovers, probes, and the moons of Saturn.

We also discuss Sputnik, Mir, and Instagram exclusives.

This is a public episode. If you\\u2019d like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe'