Scientists have discovered three small planets that they think could support life. The planets are orbiting a dwarf star. Previously, scientists have thought dwarf stars to be too small and too cool to hold habitable planets in their orbits. The researchers used a special telescope to watch the space around the star, called TRAPPIST-1, for 62 nights. They saw tiny shifts in the light, which led them to discover the orbiting planets. The planets are about the size of Earth. Two of the planets are close enough to the star that they may have the ability to sustain life. Scientists will continue to study these planets over the coming years.