Using NASA's Kepler Space Telescope, astronomers have found more than 100 exoplanets — planets orbiting other stars — and four possibly rocky planets, two of which may be capable of supporting life. The international team found 197 planet candidates, with 104 being confirmed as exoplanets. One method of discovering exoplanets is to measure light emitted from stars. A minute dimming of a star could mean that a planet is orbiting it, blocking out some of the light as it crosses, or transits, the star. Using this method, astronomers found four planets orbiting a dim star called K2-72 that lies 181 light-years away within the constellation of Aquarius. The star is less than half the size of our own sun. The four planets are between 20 to 50 per cent larger than Earth and have orbital periods between five-and-a-half to 24 days. Two of the planets, however, could be potentially habitable. When assessing the likelihood of a planet being suitable for life, astronomers consider the "habitable