This week in science: two worlds for one

Two years ago, NASA’s New Horizons revolutionized our appreciation of Pluto and its moons. The little probe is still functioning and speeding out of the solar system into interstellar space at 10 miles a second. But before it fades into the cosmic night forever, it will reconnoiter an enigmatic Kuiper Belt Object called 2014 MU69. Recent observations suggest the object will be a two-for-one deal:

MU69 appears to be either a binary orbiting pair or a contact (stuck together) pair of...

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