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LIVE VIDEO: NASA's Maven Mars launch

The mission will study the Martian upper atmosphere in hopes of learning what changed the planet's once Earth-like climate.
/ Source: MSNBC TV

The mission will study the Martian upper atmosphere in hopes of learning what changed the planet's once Earth-like climate.

LIVE VIDEO —Watch the launch of the unmanned spacecraft Maven. The mission becomes the first study of the Martian upper atmosphere in hopes of learning what changed the planet’s once Earth-like climate.