1st known moon outside Solar System may have been found

For the first time, astronomers have discovered what could be an 'exomoon', a moon outside the Solar System. The 'exomoon', which was found in orbit around a gigantic gas planet 8,000 light-years from the Earth, is estimated to be the size of Neptune. It was spotted in the data from NASA's Kepler spacecraft and later observed using the Hubble telescope.