Eleven years ago today, NASA made an intriguing announcement. Using the Kepler space telescope, the agency had discovered an exoplanet the size of Earth located in the habitable zone of another star.

Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

CAPE CANAVERAL, Fla. (AP) – For the first time, astronomers have discovered seven Earth-size planets orbiting a single nearby star – and these new worlds could hold life. This cluster of planets is ...

A NASA mission has spotted an Earth-size exoplanet orbiting a small star about 100 light-years away. The planet, named TOI 700 e, is likely rocky and 95% the size of our world. The celestial body is ...

Add Yahoo as a preferred source to see more of our stories on Google. White dwarf stars, like this one shown shrouded by a planetary nebula, are much smaller than stars like our Sun. NASA/R. Ciardullo ...

A rocky, Earth-size planet located in our Milky Way galaxy may have an atmosphere around it, according to new research, raising the possibility that it could also have liquid water on its surface and ...