Article: NASA's new space age.(new probes)

* NASA's first age of interplanetary exploration included the Luna, Mariner, Ranger and Lunar Orbiter spacecraft of the 1960s-primitive vehicles that explored outer space for the first time in the history of mankind. The second age featured high-cost specialized craft like Viking and Voyager. The third age, just concluding, featured the ultra-expensive, one-of-a-kind Galileo, Mars Observer and Cassini. Now, in preparation for the 21st century, NASA is embarking on a fourth age of space exploration. This includes the low-cost Discovery probes and new, miniaturized high-tech craft exemplified by the New Mirennium spacecraft.

With today's massive budget deficits, every ...

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