A team of astronomers, after carefully combing data from NASA's Kepler space telescope, has finally nailed a world that might be similar to our own. But is it inhabited? Finding the answer is not easy.
This month astronomers announced that Alpha Centauri B may have an Earth-sized planet in tight orbit. Space enthusiasts were ecstatic, becauseAlpha Centauri is the closest star system to ours. Many expressed the hope that the discovery might spur a space exploration renaissance.