Cassiopeia

I know nothing about constellations. I can only recognize Orion and Cassiopeia. Oh, and the Big Dipper, too.

One night in 1572, Danish astronomer Tycho Brahe saw what he thought was a brilliant new star in the constellation Cassiopeia. (We now know he was observing a supernova.) In 1604, a second supernova was observed. These discoveries caused scientists to seriously question Ptolemy's theory that all stars were contained in an outermost sphere of the universe that never changed.

That's Cassiopeia.

It’s a type of neutron star known as a magnetar and is located about 10,000 light-years away from Earth in the constellation Cassiopeia.