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Visualizing Gravity Wells
Another great new infographic comic from xkcd.com. A mix of real science and humor, this one plays on the words “gravity well” by visualizing the strength of each planets gravity as the depth of a crater scaled to Earth’s surface gravity. The chart shows the “depth” of various solar system gravity wells. Each well is scaled such that rising out of a physical well of that depth - in constant Earth surface gravity - would take the same energy as escaping that planet’s gravity in reality.