Slow, moonless Sedna baffles the skywatchers

April 2004
New Scientist;4/24/2004, Vol. 182 Issue 2444, p19
Hubble images of the most distant object ever seen in the solar system have left astronomers puzzled. The planetoid Sedna appears not to have a moon, which would have accounted for its slow rotation. A team led by researcher Mike Brown of the California Institute of Technology discovered the planetoid Sedna in November 2003. Its 10,000 year orbit carries it out 900 times as far as Earth is from the sun, putting it in the inner reaches of the oort cloud of icy bodies that surrounds the solar system.


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