Curiosity showing its age after 2 years on Mars

Earlier this month, NASA held a party for a 2-year-old that can't walk... but it sure can crawl.

Back on August 5, the Jet Propulsion Laboratory in Pasadena celebrated the second anniversary of the day that the Curiosity rover landed on Mars. Among its successes, the rover uncovered signs of an ancient freshwater lake on Mars that could have been capable of supporting primitive life.

After being on the Red Planet for two years, you might be wondering how the rover is holding up. Curiosity recently took a series of selfies showing dirtier, dingier machine than the one that left earth:

NASA's next rover mission to Mars is expected to launch in 2020. It will include an experiment to distill oxygen from Martian carbon dioxide - which would be useful for a future manned mission.

The Associated Press contributed to this report.

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