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Gravity's Milky Way Rides Everything

  • December 29, 20094:29 pm PST
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gravity_wellsI don't exactly know what to say about xkcd's illustration of our planets' and moons' gravity wells, other than that it's completely awesome-and a handy tool for understanding astronomical forces. Did you know that you could throw a baseball hard enough to exit the gravitational pull of the moon Phobos? Now you do.

Check out the large version here.

Via Kottke.