We’re suddenly very aware of comets. The spectacular Rosetta mission of the European Space Agency, launched way back in 2004, used three slingshot gravity assists from near-Earth fly-bys before it finally caught up to comet 67P this August while both were moving at 34,000 miles per hour. Orbiting the mountain-sized chunk of ice and dust, it has now dropped a lander onto its surface from a height of 14 miles.
A wild adventure! The minuscule gravity of the tiny 2.5-mile-wide comet was not enough to prevent the springy legs of . . .
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