Cassini Discovers Oxygen Around Saturn's Moon

By Meera Dolasia on November 28, 2010

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NASA's Cassini Spacecraft, which has been orbiting Saturn for about six years, has not only sent back amazing pictures, but also, exciting discoveries about the ringed planet. Just a few months back, the spacecraft found evidence of alien life on Titan, Saturn's largest moon and now, it seems that Rhea, its second largest moon has an atmosphere similar to that of Earth.

Earlier this week, scientists revealed the Rhea's thin atmosphere comprised of carbon dioxide and oxygen. This is the first time a spacecraft has been able capture direct evidence of oxygen on a planet other than Earth. Previously the only evidence of oxygen has been gleaned from wisps detected by the Hubble Telescope.

The scientists believe that the oxygen in Rhea's atmosphere is derived from the ice off the surface of the frozen moon. As Saturn's magnetic field rotates around the moon it showers it with energetic particles. When these hit Rhea, they break the water molecules on its surface, releasing the oxygen. The carbon dioxide could be the result of carbon rich materials deposited by meteors that smash against the moon's surface or simply, the release of dry ice that is trapped inside.

While this is great news, the scientists also concluded that the atmosphere around Rhea's 1500 km circumference, is about 5 trillion times less dense than that of Earth and therefore, not enough to sustain life. However, what it does prove is that there could be other planets in our Universe or Solar System, with similar atmospheres, raising the probability of alien life.

This is probably not the last we hear about the fascinating finds on Saturn. The Cassini Solstice Mission is expected to continue until September 2017 and besides exploring Saturn's moons, it will also analyze its infamous rings, before the mission is completed - So stay tuned, for more fascinating news.

Sources: guardian.co.uk, redorbit.com

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223 Comments
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  • raykicker9/10/2014
    wow
    • cst86229/5/2014
      how do it get there i wonder
      • Scarlet3/27/2014
        Love it
        • saturn5/7/2013
          that is just amazing
          • Wow girl5/6/2013
            Oxygen there wow im impressed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
            • cahill74
              cahill746/29/2012
              so cool!
              • Verve likes Saturn12/12/2011
                Saturn is so cool
                • 6212/5/2011
                  Beast
                  • Erin2/21/2011
                    I wonder if we'll ever be able to live on another planet. Mars, maybe??I don't think I can live in a place where all I can see is pink. I would DIE. Anyways, this article is cool:)
                    • zack mmmkay2/15/2011
                      i like that a lot i think it is cool

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