#11: Geoff Marcy Leads the Hunt to Find Planets Like Our Own

The universe is looking a lot less lonely these days, and Geoff Marcy can take a lot of credit for that. An astronomer at the University of California, Berkeley, he is leading the search for exoplanets: worlds that orbit other stars. His research has uncovered many oddities, such as hot Jupiters (gas balls that bake in thousand-degree heat) and backward-orbiting objects, but he also found the first multiplanet system that is roughly analogous to the solar system. Last fall he estimated that, judging from his observations, our galaxy may contain tens of billions of planets roughly the size and mass of Earth. And now, as coinvestigator on NASA’s Kepler space telescope, he is close to finding some of them. In February, Kepler will release its first major set of observations; early word is that the data will include tentative identification of several hundred planets that are just slightly larger than our own.