Article: Beyond Pluto, a new frontier of discovery.(FEATURES)(PLANET)

Byline: Peter N. Spotts Staff writer of The Christian Science Monitor

FLAGSTAFF, ARIZ. -- It's an old trap in science - to look at a field of research and conclude that all the big questions have been answered, leaving little to do but cross the t's and dot the i's.

Robert Millis nearly stumbled into that trap.

"I've been a ground-based astronomer my whole career, and I have to tell you, 10 or 15 years ago I was becoming a bit discouraged," he recalls. When it came to the solar system, "the period of genuine exploration

- pushing back frontiers and finding totally new things - seemed to me to be over."

Now, he and his ...

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