Oumuamua Update: The first visitor from interstellar space, Oumuamua is Red, Tumbling, and Silent. (the size of a skyscraper) It is called an Interstellar Asteroid, though some believe it could be an Interstellar Comet (icy).
https://www.space.com/39129-oumuamua-interstellar-object-comet-in-disguise.html
http://www.skyandtelescope.com/astronomy-news/solar-system/oumuamua-red-tumbling-and-silent/
https://www.nasa.gov/feature/solar-system-s-first-interstellar-visitor-dazzles-scientists
Interesting one