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Atom & Cosmos

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‘Oumuamua asteroid

ICY INTERIOR  The solar system’s first interstellar visitor might be a comet rather than an asteroid. The object, seen in this artist's representation, may have an icy heart surrounded by an insulating crust, researchers suggest.

Kepler 90 system

THIRD ROCK  The keen eye of an AI program discovered that the star system Kepler 90, illustrated here, has an eighth world (dubbed Kepler 90i), which was previously overlooked in exoplanet searches.

Saturn’s rings again

BABY FACE  Saturn’s rings (shown in an image taken by NASA’s Cassini spacecraft on August 12, 2017) are relatively young, a few hundred million years old at most, astronomers say.

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