Science s NASA's Mars program riding on a rover heading for touch down

The one-ton Mars rover named Curiosity is set to land on the red planet at around 1:31 am Eastern time. 

Damian Dovarganes/AP/File

In less than eight hours, the world will witness either the greatest feat yet in the history of solar-system exploration or another humbling reminder that, yes, it is hard to land spacecraft on Mars.

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