First interstellar asteroid

For the first time ever astronomers have studied an asteroid that has entered the Solar System from interstellar space. Observations from ESO’s Very Large Telescope in Chile and other observatories around the world show that this unique object was traveling through space for millions of years before its chance encounter with our star system. It appears to be a dark, reddish, highly-elongated rocky or high-metal-content object.

Source: First interstellar asteroid is like nothing seen before: VLT reveals dark, reddish and highly-elongated object — ScienceDaily