Markarian 266 is a pair of merging galaxies that now contains two supermassive black holes.

Mu Columbae is a bright, blue star that was ejected from the Orion Nebula in a complex gravitational interaction involving three other stars.

WASP-1 was the first star identified as having an exoplanet by the Wide Angle Search for Planets and thus helped to validate the techniques used by that survey.

The cluster Abell 168 formed from the merger of two smaller clusters, and this had many weird effects on the intracluster gas between the galaxies.

WD 2211-495 is a small, hot white dwarf with a rather unusual amount of heavy elements in its outer atmosphere, implying that something from a surrounding planetary system occasionally falls into the star.

UGC 7321 is an unusually flat (or superthin) spiral galaxy, which is indicative of how it has avoided gravitational interactions with other galaxies that could alter its shape.

The elliptical galaxy contains an abnormal amount of interstellar dust with no accompanying interstellar gas, which is weird.

Antlia 2, which was recently found orbiting the Milky Way, is the most diffuse galaxy that anyone has ever discovered up to this point in time.

UKS 1 probably lies on the far side of the Milky Way, and the light from the cluster is heavily obscured by interstellar dust, but even though it's hard to see, astronomers are still really interested in it.

R Aquarii could be described as one of the closest symbiotic binary star systems to Earth, but it's more complicated than that.