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Separated at Birth?

Despite their differences, Pluto and Ceres might be twins

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MAGAZINE HIGHLIGHTS

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Astronomers See and Hear the Cosmos

A gravitational wave and a flash of light open up a new field of astronomy.
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Cassini Is Dead; Long Live Cassini

The Saturn probe completes its years-long mission in a fiery descent.
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7 Whole New Worlds

A record-breaking number of Earth-sized planets orbit a faint star in a nearby galaxy.
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