Today In The Space World on MSN
Sedna and the Hunt for Planet Nine: The Solar System’s Greatest Mysteries
Venture into the extreme outer reaches of the solar system to explore the most distant and enigmatic bodies ever discovered. Meet Sedna, Gong Gong, and Eris as we investigate their strange orbits, ...
It's been one Neptunian year—or about 165 Earth years—since astronomers first observed the most distant planet from the sun.
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