These two diminutive galaxies seemed to be forever bound to our own

Now one measurement of their velocities has "thrown out everything we thought we understood about their history and evolution," a researcher said. Turns out the little parasites are just passing through.

Theory-Busting Black Hole

Black holes come in three sizes: Small, medium, and extra-large. Now you can add really-big-small to the list.

A newfound stellar black hole

weighs in at 16 solar masses, more than theory said was possible. We love when theories get tossed out the cosmic window!

Dark Finding

The hidden stuff, noted by its gravitational effects, must be invisible material that astronomer call dark matter. In separate work, astronomers made a 3D map of dark matter across a big swath of space and time. Of course, nobody knows what the heck dark matter is.