Pluto may be the most popular dwarf planet on Earth, but this one was the first ⬇️
, which rings the outer solar system. But Eris is even farther-flung than Pluto, circling our star about three times farther away. It takes 561 years for the distant dwarf planet to make a single trip around the sun, though it rotates once every 25 hours, making the length of its day very similar to a day on Earth. when the dwarf planet passed in front of a dim star in 2010, in an event known as an occultation.
Newer studies show that Eris likely is a spherical body. And, by studying the motion of Eris' moon, Dysnomia , they estimate the dwarf planet is about 27% heavier than Pluto, which means it's denser than Pluto as well.
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