Douglas Caldwell

Douglas Caldwell – A decade ago, astronomers could only speculate about whether planets were a happy commonplace in the universe, or distressingly rare. The discovery of hundreds of worlds around other stars has shown that planets orbit at least 5 to 10 percent of all stars. But how many of these planets are Earth-size, and possibly Earth-like? Physicist Doug Caldwell is an expert on one of the most promising schemes for finding small worlds far beyond our solar system: looking for the slight dimming of a star caused when a planet crosses between it and us.