Telegraph

How about saving the Earth rather than moving to Mars?

How about saving the Earth rather than moving to Mars?

On Friday morning, scientists at the Jet Propulsion Lab in Pasadena watched their Cassini spacecraft take a suicide dive into Saturn's atmosphere, thus ending two decades of spectacular exploration of the giant planet and its multiple moons.

Cassini was about to run out of fuel and, though it could have continued sending data back to Earth, the folks at JPL would no longer have been able to steer its course. The decision was made to destroy the spacecraft now to avoid any chance that it might crash into Titan or Enceladus and contaminate the potentially life-sustaining environments of either of those moons.

Those are magic words: life-sustaining. During its long trek around...

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