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Atom & Cosmos

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Saturn's moon Mimas

Craters blemish Saturn’s moon Mimas, including a large one that makes the moon look like the Death Star in Star Wars. A lack of cracks on the moon’s surface, though, casts doubt on the presence of a subsurface ocean, new research suggests.

supermassive black hole

SLOW EATER  A supermassive black hole has set a record for the longest meal, slurping on a single star for more than 10 years. In this artist’s illustration of the event, gas from the star (red) falls toward the black hole, while a wind blows the other way (blue).

illustration of a seven planet solar system

PLANETARY LINEUP  Seven Earth-sized planets orbit the star TRAPPIST-1 with short periods, from 1.5 to 20 Earth days. This artist’s illustration shows potential differences in the planets’ surfaces and sizes.

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