Pluto’s “almost twin” dwarf planet Eris is surprisingly squishy

Nearly 18 years ago, astronomers discovered an icy mini-world called… Iris Billions of miles beyond Neptune. But unlike its cousin, the dwarf planet Pluto – which… new Horizons It was upgraded to a rich, dynamic world after its visit in 2015 – and Iris had no robotic visitors. It is so far from Earth, in fact, that it appears in observations just like a single pixel of light.

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