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Thursday, January 22, 2009

Outlying Moons Suitable for Exploration

Depiction of surface of Saturn moon Titan.

NASA’s leading candidates for extraterrestrial life are now Saturn’s moons Titan and Enceladus or perhaps Jupiter’s moons Europa and Ganymede. Scientists are weighing the possibilities in anticipation of picking a destination for a $4 billion space mission set for around 2020.

According to the BBC, the potential Saturn mission would follow up the remarkable discoveries made by the Nasa/Esa Cassini-Huygens mission which continues to operate at the ringed planet. Cassini has sent back data that indicates Titan is akin to a primitive ~ albeit frozen ~ Earth. It has a thick atmosphere and is rich in organic (carbon-rich) molecules.

But Nature News says the arguments for exploring Jupiter’s moons are just as compelling. In 1995, the Galileo probe began an 8-year tour of Jupiter’s system, during which it snapped the first close-ups of Europa’s scarred surface. Analysis of a magnetic anomaly soon revealed the moon’s most astonishing feature: that eggshell of ice is thought to enclose a warm, salty ocean. Scientists immediately clamoured to return.

Click here for the Discover magazine article.

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