Astronomers at the Harvard-Smithsonian Center for Astrophysics say they're studying a planetary body that is so dark that it reflects less light than black acrylic paint. The planet, TrES-2b, is about the size of Jupiter and casts a faint red glow thanks in part to its gaseous atmosphere, which is composed of unknown light-absorbing chemicals. As for what exactly makes the planet so dark, scientists say they are stumped.

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