NGC 1532, known as Haley’s Coronet, is an edge-on barred spiral galaxy located 50 million light-years away, in the constellation of Eridanus. It was discovered by James Dunlop in 1826. ...
In 1054, Chinese astronomers noticed a "guest star" that was visible in the daytime sky for about a month. The "guest star" they saw was a supernova explosion that produced the Crab Neb...