Defending against charges that its planned lunar mission is nothing more than "Apollo on steroids," NASA insists that the U.S. space program will break important new ground with its pricey new Constellation program. "It's not just flags and footsteps," says a NASA official. "It's substantially important work." Besides simply helping to pave the way to Mars, scientists say astronauts could build a radio telescope on the far side of the moon and excavate the lunar surface for signs of water.
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