Not long ago in Seattle, an astronomical event of sorts happened: Two superstars collided. William Shatner, of "Star Trek" fame, and Neil deGrasse Tyson, America's favorite astrophysicist, took to the stage to explore the nature of exploration. Think of it as sort of Martin & Lewis, but with more quantum mechanics.

"It's a bromance," said Tyson. "I think what Bill Shatner and I have together should be the textbook definition of the bromance."

"If we have a bromance," said Shatner, "I'd be very privileged."

The two grew close last year on an upscale cruise to Antarctica, where they ended up being the after-dinner entertainment. "The organizer said, 'Why don't we put the two of you on this mini-stage that they have on the ship, and we just chew the fat?'" said Tyson. "And then the organiz

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