LONG-DEAD NASA SPACECRAFT WAKES UP

Amateur astronomer Scott Tilley has a hobby: He hunts spy satellites. Using an S-band radio antenna in Roberts Creek, British Columbia, he regularly scans the skies for radio signals from classified objects orbiting Earth. Since he started 5 years ago, Tilley has bagged dozens of secret or unlisted satellites. "It's a lot of fun," he confesses.

Earlier this month, Tilley was hunting for Zuma--a secretive United States government satellite lost in a launch mishap on Jan. 8th--when a J-shaped curve appeared on his computer screen. "It was the signature of a lost satellite," he says, "but it was not Zuma."

In a stroke of good luck that has dizzied space scientists, Tilley found IMAGE, a NASA spacecraft that "died" more than 10 years ago.

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