Editors' ChoiceOuter Solar System

A probable dwarf planet beyond Neptune

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Science  12 May 2017:
Vol. 356, Issue 6338, pp. 595-596
DOI: 10.1126/science.356.6338.595-f

The cold outer reaches of our solar system host an array of orbiting bodies and may even hide a distant planet. Gerdes et al. have searched for new bodies in that region by using an optical survey that is primarily used for cosmology. They discovered an object, designated 2014 UZ224, located 92 times as far from the Sun as Earth—making it the second-most distant body whose orbit is known. Follow-up millimeter-wavelength observations allowed them to measure the thermal emission and thereby estimate the body's size and temperature. With a diameter of around 600 km, it is probably a dwarf planet.

Astrophys. J. 839, L15 (2017).

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