The first interstellar object, not bound to our Sun, has (most likely) just been observed. A/2017 U1, only some 400m across, was spotted by the Pan-STARRS 1 telescope (Panoramic Survey Telescope And Rapid Response System), based on Maui, Hawaii, just over a week ago. This object, either an asteroid or comet, possibly ejected during embryonic formation of some solar system, is moving fast enough and in such an orbit (arriving from well above the ecliptic, the plane of the solar system) that very strongly hints at it wandering freely in the galaxy. A/2017 U1 is a temporary name, being the first class of such object to be spotted, until such time as a naming scheme for these objects can be agreed upon. A short (~3 week) campaign to intensively study it is currently underway before it is beyond the useful observation range of Earth bound telescopes (ie whilst it is still bright enough). More details in this JPL press release.