It's a compelling theory that could explain a lot.

Secret Moon

A team of astronomers at MIT suspect Saturn may be hiding the remains of an ancient moon in its rings — which could explain the planet's unusual tilt.

In a new paper published in the journal Science this week, the team suggests there may have been a sizable satellite dubbed Chrysalis orbiting the gas giant for several billion years, a tantalizing new theory that could explain why the planet is spinning at a highly unusual 26.7-degree angle.

Close Encounters

The scientists propose that after being in Saturn's orbit for billions of years, Chrysalis got a little too close to its host planet around 160 million years ago, obliterating itself in the process. This violent event was catastrophic enough to permanently adjust its tilt.

The theory could also explain how Saturn's rings formed in the first place, with the team suggesting large amounts of icy chunks originated from the remains of Chrysalis.

"Just like a butterfly’s chrysalis, this satellite was long dormant and suddenly became active, and the rings emerged," said Jack Wisdom, professor of planetary sciences at MIT and lead author of the new study, in a statement.

Mass Effect

To reach that conclusion, the researchers used gravitational field data collected by Cassini during its extremely close approach to model the distribution of mass inside Saturn.

According to their calculations, Chrysalis would have had to be the size of Saturn's third-largest moon Iapetus before getting torn to pieces.

"It’s a pretty good story, but like any other result, it will have to be examined by others," Wisdom said in the statement. "But it seems that this lost satellite was just a chrysalis, waiting to have its instability."

READ MORE: Saturn’s rings and tilt could be the product of an ancient, missing moon [MIT]

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