They discovered an Earth - sized planet that might be habitable . It ` ` ##s the existence of worlds that might be similar to our own , '' institute says . Scientists are looking for emissions that could indicate extraterrestrial life . `` This discovery not only proves the existence of worlds that might be similar to our own but will undoubtedly shape future investigations of exoplanets that could have terrestrial surface environments , '' the institute said in an announcement Thursday . Previously , worlds were larger than Earth .
They discovered an Earth - sized planet that might be habitable . It ` ` ##s the existence of worlds that might be similar to our own , '' institute says . Scientists are looking for emissions that could indicate extraterrestrial life . Previously , worlds were larger than Earth .