First 'Exomoon' Responsible for Mystery Signal?
Paul Rincon, BBC
Astronomers have discovered an object that could be the first known moon located beyond the Solar System.If genuine, the "exomoon" is likely to be about the size and mass of Neptune, and circles a planet the size of Jupiter but with 10 times the mass.The signal was detected by Nasa's Kepler Space Telescope; astronomers now plan to carry out follow-up observations with Hubble in October.