On Jan. 1, 2019, NASA's New Horizons spacecraft will fly past 2014 MU69, the most distant and most pristine bit of the solar system ever explored. Now astronomers think MU69 has a moon. https://www.nytimes.com/2017/12/12/science/tiny-moon-new-horizons.html …
4:11 PM - 12 Dec 2017
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