A team working with data from the dearly departed Kepler space telescope has reported a possible moon orbiting an exoplanet some 5,000 light years away. It falls somewhere between the size of Earth ...

For the first time, astronomers have discovered what could be an exomoon, a moon outside our solar system. The so-called exomoon, which is estimated to be the size of Neptune, was found in orbit ...

There aren't a lot of Hot Neptunes in the galaxy, and it's not entirely clear why. A Hot Neptune is, as the name implies, a Neptune-sized planet orbiting within 1 AU of its host star. While we've ...

WASHINGTON (Reuters) - Astronomers have pinpointed what appears to be the first moon detected outside our solar system, a large gaseous world the size of Neptune that is unlike any other known moon ...