Destination Mars

Sending mice into space is just one step toward putting astronauts on Mars.

By Emily Sohn, 00:00 AM March 15, 2004

If you're lucky, you might someday walk on the surface of Mars.

For some scientists, the question is no longer whether people will ever get to Mars. It's a question of when people will travel there. The most cautious of the bunch say it may take many decades to overcome the obstacles standing in the way of such an expedition. Others are more optimistic.

"I'd like to think that missions will be going there as early as 15 years from now," says Paul Wooster. He's director of the Mars Gravity ...

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