Astronomers on Mauna Kea who found a possible 10th planet on the edge of our solar system have made another discovery -- it has a moon.
Using the W.M. Keck Observatory, a team of astronomers spotted a faint object trailing next to it on Sept. 10.
The new planet has been temporarily nicknamed Xena after a "warrior princess" character on a television show, so the moon is being called Gabrielle, after a sidekick of the television warrior, the Keck Observatory said.
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