The best thing about astronomy? All the weird stuff that's happening out there. In this article at National Geographic, we're introduced to two stars which are circling each other in five-minute orbits, travelling at 310 miles a second.
From the article:
"Two extremely dense stars in an intimate dance are spinning around each other in just 5.4 minutes – making them the fastest known stellar partners in the galaxy, astronomers have confirmed. To have such a speedy orbit, the stars must be moving at about 310 miles (500 kilometers) a second, the team calculates."