Space and astronomy news
This composite image of the primordial contact binary Kuiper Belt object 2014 MU69 was compiled from data obtained by NASA's New Horizons spacecraft as it flew by the object on Jan. 1, 2019. The image combines enhanced color data with detailed high-resolution panchromatic pictures.
By far the most famous of all the TNOs is Pluto. Even though Pluto spends 20 years of every orbit closer to the Sun than Neptune, it spends the vast majority of its time farther away. At that distance, the light of the Sun is so dim that Pluto exists in permanent twilight, and temperatures are cold enough for the world to support giant mountains made of pure water ice.
Even though Pluto is the largest of the TNOs by radius, it is not the most massive. That honor goes to Eris. That world has a highly eccentric orbit. At its closest approach to the Sun, it’s about 38 times farther way than the Earth. At its most distant, it’s nearly 100 times farther away. Some other TNOs have orbits three times bigger.
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