NASA scientists eyeing a crater they call "the candy store" have
sent the Mars rover Opportunity to the very edge -- literally. The
rover's front wheels Wednesday rolled over the lip of a crater
called Endurance, onto a 25-percent grade. It's the kind of slope
that could trip up Opportunity and send it crashing to the bottom
of the abyss. Even if it makes it safely down that steep incline,
there are questions about whether Opportunity can make it back out
again.
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