20-60% Stars Can Give Rise To Life-Supporting Planets Boston (Massachusetts): Planets resembling Earth can be found orbiting many Sun-like stars in our galaxy, increasing the prospects of finding extraterrestial life on some of them, according to a study released on Sunday. University of Arizona astronomer Michael Meyer, working with Nasa's Spitzer space telescope, said his research shows that between 20% and 60% of stars similar to our Sun have conditions favorable for forming rocky planets like Earth.