In recent years, scientists have (1) discovered many stars that have planets orbiting around them. There are probably many more out there yet to be discovered. Chances are, at (2) least some of these stars might have planets like Earth. The Kepler telescope, launched in 2009, is looking for planets like Earth. So far, it has found (3) more than 2,700 possible planets. A few of them are (4) similar to Earth. Scientists are looking for three things: a planet with gases like (5) oxygen and carbon dioxide that support life; a planet with water; and a planet that's not too cold or too hot. The Kepler telescope's most exciting discovery was the planet Kepler 22b. This planet is a little (6) larger than Earth, but it is about the same distance away from its star as the Earth is from the Sun. Scientists believe it might have water on it.