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The fact that some of these early experiments could take place with existing technology on future rovers is one reason mission advocates question Bush's long time frame for his Mars flights. "Johnson Space Center was a cow pasture when we started the lunar program," says Humboldt Mandell, a planetary...
One more head scratcher for at least some people in the space community is the Bush proposal's heavy reliance on the moon as a stopping point on the way to Mars. The President calls for NASA to establish a lunar base first, learn to live and work there, and...
To be sure, there's something to be said for trying out your hardware and survival skills at a campsite only three days from home as opposed to one seven months distant. Wendell Mendell, Johnson Space Center planetary scientist, worries about the physical and psychological effects of a long Mars...
"We can go directly from Earth orbit to Mars, and it would probably be simpler and less costly," says Larry Bell, space architect at the University of Houston. "Some of us don't see the necessity of going to the moon first."
There's another concern, one that worries administrators more than engineers. If NASA history has proved anything, administrators say, it's that intermediate space goals can sometimes turn into ends in themselves. "We could easily get bogged down on the moon and never get to Mars, at least not in...