News

Saturn’s Baby Moon

A NASA space probe spots a possible new moon for the ringed planet

April 16, 2014
JPL/CALTECH/SPACE SCIENCE INSTITUTE/NASA

A small object spotted in Saturn's outermost ring may be a new moon.

NASA put the first human on the moon in 1969. Should America’s space agency ever set its sights on landing an astronaut on a moon of Saturn, there are plenty to choose from. The ringed planet has 53 known moons. And another one may be on the way. NASA’s Cassini-Huygens space probe has spotted a small shape in Saturn’s outermost ring. It suggests the existence of a new moon. The moon has not been directly spotted yet, but scientists have already given it a nickname: Peggy.

Saturn is known as "the ringed planet" because it has thousands of rings made of rock, ice and dust.

GETTY IMAGES
Saturn is known as "the ringed planet" because it has thousands of rings made of rock, ice and dust.

Moon Maker

The probe’s findings were just published in the journal Icarus. Cassini has been observing the ringed planet and its surroundings since 2004. Saturn is a big and powerful world. With a diameter of 74,732 miles, it is 9 ½ times the size of Earth. It spins very quickly, and takes only 11 hours to rotate fully on its axis. The planet is located about 885.9 million miles from the sun and has an average temperature of -285 degrees Fahrenheit. Brrrr!

Peggy will be joining a large community. Saturn has thousands of rings. The outermost ring, called the A Ring, is the largest and brightest. It measures 750 miles long and 6 miles wide.  Saturn’s rings are made up of rock, dust and ice, and are constantly gathering space matter. As this material gathers and clumps together, moons are born.

Room to Grow

If Peggy is a new moon, it is also a tiny one, measuring only 0.5 miles in diameter. But there is no telling how big this baby will grow over time. “We’ve never seen anything like this before,” said astronomer Carl Murray in a statement. He is the lead author of the Icarus report. “We may be looking at the act of birth, where this object is leaving the rings and heading off to be a moon in its own right.” Once that happens, it will be given a formal name.

However, this mini moon may be one of Saturn’s last. The formation of all its moons, new and old, big and small, has used up much of the rings’ raw material. After 4.5 billion years, Saturn may have finally revealed all its babies.


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