Comet 67P/Churyumov-Gerasimenko is a 4-km-wide, double-lobed world with a surface as dark as coal, reflecting only 4% of sunlight. Its gravity is so weak that an astronaut could jump off. As it nears the Sun, escaping gas and dust form its glowing coma and tails.
Credit: ESA, Rosetta, NAVCAM
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