Sedna's extreme orbit hints at a hidden planet
Sedna, an icy world with the solar system's most distant known orbit, takes millennia to circle the Sun, hinting at the gravitational pull of a hidden planet.
Sedna, a mysterious object discovered in 2003, holds the record for the most distant known orbit in our solar system, reaching nearly 14 billion kilometers from the Sun. This 'sednoid' travels so far that its highly elliptical path takes an astonishing 11,400 years to complete. Its unique journey challenges our understanding of how the solar system formed.
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