This image of the planet Mercury was taken by NASA's unmanned Messenger spacecraft during its October 6, 2008, fly-by of the planet closest to the sun. NASA scientists said on Oct. 29 that data sent back to Earth from the fly-by provides fresh evidence that volcanic activity played a central role in Mercury's past, now seen as a dead planet geologically.
30 October 2008
Space
This image of the planet Mercury was taken by NASA's unmanned Messenger spacecraft during its October 6, 2008, fly-by of the planet closest to the sun. NASA scientists said on Oct. 29 that data sent back to Earth from the fly-by provides fresh evidence that volcanic activity played a central role in Mercury's past, now seen as a dead planet geologically.
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