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Astrobiology

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illustration of TRAPPIST-1

SEVEN IN ONE GO  The small, cool star TRAPPIST-1, illustrated here, hosts a bevy of Earth-sized planets. There could be many more stars like it worth studying.

Cepheus B

STELLAR PETRI DISH  The nurseries where stars are born, like Cepheus B (shown), are bathed in ultraviolet radiation. That radiation could make ice act like a liquid and help organic molecules form in space.

Illustration of Cassini's death

BLAZE OF GLORY  Cassini burned up like a comet above Saturn’s cloud tops just before 5 a.m. PDT on September 15. This artist’s illustration shows what it may have looked like.

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