Gravity Wells

Click to embiggen.

Today on xkcd, a really awesome diagram that shows the “depth” of the gravity wells of various planets in the solar system. Essentially, it shows the amount of energy required to escape their gravity as though they were wells on which Earth’s gravity acts uniformly. Interestingly, you could escape Mars’ moon Deimos with a bike and a ramp.

Gravity Wells [xkcd]

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