Nasa's Maven mission launches on Monday, aimed at studying how and why Mars lost its atmosphere, once thought to be similar to Earth's. The spacecraft will orbit at about 4,000 miles (6400 km) above the planet for a year, recording changes in its atmosphere. via Pocket http://www.bbc.co.uk/news/science-environment-24983301#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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