NGC 4038 and NGC 4039 also called "Antennae Galaxies" are a pair of interacting galaxies located about 45 million light-years away and visible in the direction of the constellation Corv...
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...