Mars' resilient rovers, and more

The NASA probes Spirit and Opportunity enjoy their golden years.

Mars' resilient rovers

The NASA probes Spirit and Opportunity, which were originally expected to operate on the surface of Mars for three months, are still working after five years. The two rovers alit on the Red Planet in early January 2004; since then, they have covered more than 13 miles and sent 250,000 images back to Earth. NASA engineers now plan to direct the probes to four new sites in the coming months. “These rovers are incredibly resilient, considering the extreme environment the hardware experiences every day,” said John Callas of the Jet Propulsion Laboratory.

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