19 February 2016

Pluto's Moon Charon May Have Ruptured From Within

Article re posted from http://www.popsci.com/where-do-charons-massive-chasms-come-from

Pluto's moon Charon in New Horizons color-processed image

Pluto's moon Charon, closer than ever

When the New Horizons spacecraft returned the first closeup pictures of Pluto's moon Charon last year, scientists were surprised to see a huge chasm gouging across the moon's middle. Now they have a good guess as to what caused it: Charon is bursting at the seams.

Or at least it used to be. When Charon was young, it had a radioactive core to keep it warm. Beneath its icy shell, that warm center may have melted a watery subsurface ocean. Later, when the moon's radioactive fuel ran out and the center cooled, that ocean may have frozen and expanded, splitting Charon across the middle.

The New Horizons team arrived at this hypothesis after finding evidence that parts of the surface ice had melted and re-frozen.

Charon's chasms are about 1,100 miles long, or about four times longer than the Grand Canyon, and 4.5 miles deep in some places.

NASA/JHUAPL/SwRI

An elevation map of Charon's informally named Serenity Chasma

Shape measurements in the colorful map indicate that parts of the surface melted and re-froze long ago.



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