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Tiny Neptune Moon Spotted by Hubble may have Broken from Larger Moon

An artist’s concept of the tiny moon Hippocamp that was discovered by the Hubble Space Telescope in 2013. Only 20 miles across, it may actually be a broken-off fragment from a much larger neighboring moon, Proteus, seen as a crescent in the background. This is the first evidence for a moon being an offshoot from a comet collision with a much larger parent body.
Credit: NASA, ESA and J. Olmsted (STScI)

Astronomers call it “the moon that shouldn’t be there.” After several years of analysis, a team of planetary scientists using NASA’s Hubble Space Telescope has at last come up with an explanation for a mysterious moon around Neptune that they discovered with Hubble in 2013.

The tiny moon, named Hippocamp, is unusually close to a much larger Neptunian moon called Proteus...

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Mars to lose its largest moon, Phobos, but gain a Ring

Mars could gain a ring in 10-20 million years when its moon Phobos is torn to shreds by tidal forces due to Mars' gravitational pull. Credit: Image by Tushar Mittal using Celestia 2001-2010, Celestia Development Team.

Mars could gain a ring in 10-20 million years when its moon Phobos is torn to shreds by tidal forces due to Mars’ gravitational pull. Credit: Image by Tushar Mittal using Celestia 2001-2010, Celestia Development Team.

In 10-20 million years, the moon will get so close to Mars that it’ll be shredded into a ring, eventually be torn apart by tidal forces and distributed in a ring around the planet, a study of the cohesiveness of Phobos has concluded. This would take about 10-20 million years, and the ring will persist for up to 100 million years before the dust falls into Mars’ atmosphere and burns up as ‘moon’ showers.

The loss is due to Phobos being highly fractured, with lots of pores and rubble...

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