
© NASA
A bizarre bulge approximately half as tall as Mount Kilimanjaro has been found on Ganymede, the largest moon in the solar system, and the unusual feature may have something to do with the subsurface ocean recently discovered on the Jovian satellite, according to reports.
The bulge is approximately 375 miles wide and nearly two miles tall,
io9 said on Friday, and its cause and purpose currently have astronomers puzzled. Paul Schenk, a planetary scientist at the Lunar and Planetary Institute in Houston, said he came across the feature by accident.
Schenk, who reported his findings at the
Lunar and Planetary Science Conference on March 20, explained to
National Geographic that he was attempting to complete the global mapping of the moon's surface when he spotted the lump, which appears to be made out of thick ice.
The feature suggests that at one time, Ganymede's icy shell rotated atop the rest of the moon. Schenk believes that the bulge began growing at one of the poles, and then moved into a different position once its mass grew large enough. The shell slid atop the ocean, while the interior of the moon stayed in the same orientation, causing it to wind up at the equator.
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