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His colleagues were less enthusiastic. One night at the Lick Observatory, in the hills east of San Jose, he ate dinner with the other astronomers sharing telescope time that evening. He told them he was looking for planets. One choked and expectorated to keep from laughing. The rest returned to their boiled broccoli and their legitimate academic conversation. To the scientists, extrasolar planets were an open question; they didn't have the public's sense that looking for planets was like looking for debris at Roswell. But they knew that they couldn't see someone drop a quarter on Neptune, and they knew that Marcy would never see a planet around another star.

If Marcy was insulted, he wasn't daunted. The promise of finding a planet had all the gee-whiz factor a scientist could ask for, enough to keep him on task for 12 years without a payout. And the work was hard. He had to make his astronomical instruments 1,000 times more sensitive than those his colleagues were using.

Think back to Marvin the alien on his planet 30 light-years away. He's looking at the sun, and for the sake of simplicity imagine that the only planet around our sun is Jupiter, the massive gaseous giant, 318 times the size of our little rock. He can see the star (our sun), but he can't make out Jupiter. So his challenge -- like Marcy's -- is to find a convincing but indirect way of proving that Jupiter exists.

Gravity connects Jupiter to the sun. Jupiter travels around the sun because the sun is much larger: Its huge gravitational pull keeps the planet sailing around it. But Jupiter has a gravitational pull, too, and it exerts a force on the sun. The sun doesn't move much, but it does lean slightly toward Jupiter as the planet revolves. Our alien astronomer 30 light-years away cannot see the planet, but maybe he can see the sun move a bit.

That's exactly what Marcy has done. He developed a technique to catch stars leaning toward their planets as the planets revolve. Marcy calls this motion a "wobble," and he uses the light coming from the star to detect it.

It works like this: When an ambulance passes you on the street, the pitch of its siren changes; it's pitched higher when it's coming toward you and lower when it's moving away. This Doppler-shift phenomenon happens because the sound waves bunch up against each other like a compressed Slinky on the approach, and then spread out like an extended Slinky on the retreat. Light waves do the same thing. So as our sun wobbles because of Jupiter's pull, it moves toward our alien Marvin some of the time, and away from him some of the time -- ever so slightly. If Marvin has a light analyzer as sensitive as the one Marcy uses, he'll be able to pick up that back-and-forth motion -- the wobble -- in the light coming from the sun, and stun his world with his report that there's a planet here.

In late 1995, Marcy was scooped by Michel Mayor, a Swiss scientist who used the same technique of looking for the Doppler shift and found the first confirmed extrasolar planet, orbiting a star called 51 Pegasi in the constellation Pegasus. Marcy and his colleagues started racing through their own amassed data -- they had been collecting light from stars for years while they worked on their analyzing software. When they crunched the numbers, they saw evidence of several planets -- they could have been first. Nevertheless, Marcy's years of persistence collecting light and improving his instruments quickly set him ahead. He announced two planets in early 1996, giving him two out of three on the planet chart. Four years later, he still holds the lead with the same ratio and no chance of being overtaken.

Most of the astrophysics community accepted the wobble-means-planet theory right away. An orbiting planet was the simplest explanation for wobbling, and scientists like simplicity. Any lingering doubts were cast away last month. Marcy found a star with a wobble that suggested a huge planet with an orbital course that would take it directly in front of the star from our point of view. This was Marcy's chance to prove unequivocally that the wobble was made by a planet. If the star dimmed when he expected the planet to be in front of the star, then there had to be a planet there, blocking some of the star's light. And that's what happened. On Nov. 7, one of Marcy's colleagues detected a 1.7-percent dip in the brightness of the star at exactly the right time.

Marcy's friends and advisors remember how much trouble academic colleagues gave him in the '80s, but today no astronomer seems to recall deriding him for his work. That would be a tough thing to admit these days, similar to a biologist forswearing evolution. Marcy's planets have essentially shifted the focus of astronomy, and astronomy has rewarded him. This summer, the University of California at Berkeley appointed him the head of its new Center for Integrative Planetary Studies, an interdisciplinary group of chemists, biologists, physicists and astronomers combining their efforts to look for life beyond our solar system.

Marcy doesn't gloat, and he hasn't slowed down. Throughout his apotheosis, he has kept his eye on the technique and on the data, determined to keep finding planets. Since he knows the planets' appeal on a "gut human level," he is conscientious about making himself accessible to the public. Through the most recent announcement of the planet dimming the star (which many reports misconstrued as "photographic" evidence of a planet), Marcy answered so many press calls that he didn't eat until 11 at night for days on end.

But that's OK, says Marcy's wife, Susan Kegley, a chemist who works for Pesticide Action Network in Berkeley: He's happy. "He has kept that childlike wonder of his science -- the curiosity that put him on the roof at the age of 14 with his little telescope," Kegley says. "He just loves it; to him, it's play."

Stay tuned for more results of Geoff Marcy's play. He promises more solar systems soon, and more attention to smaller Earth-like rock planets, which are harder to find than huge gas giants like Jupiter.

Rocks are of special interest. They're where the little green men should be.
salon.com | Dec. 2, 1999

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