(CNN) — For a craft that was launched in 1990, Hubble continues to provide us with awe-inspiring firsts. This time, In May, researchers discovered three Earth-like worlds orbiting an ultracool red dwarf star 40 light-years away.
Red dwarf stars are at the end of the range of what is classified as a star. These stars are half the temperature and a 10th the mass of the sun, so it was a first to find planets orbiting this star which also appeared to be in the "habitable zone" of the star, meaning liquid water could pool on their surfaces.
click HERE for complete article