Tarantula nebula

The Tarantula nebula (also known as 30 Doradus) is an H II region in the Large Magellanic Cloud (LMC). It was originally thought to be a star, but in 1751 Lacaille recognized it was a nebula.
The Tarantula nebula has an apparent magnitude of 8. Considering its distance of 49 kpc (160,000 light-years), this is an extremely luminous object. Its luminosity is so great that if it were as close to Earth as the Orion Nebula, the Tarantula nebula would cast shadows.
It is the most active starburst region known in the Local Group of galaxies. It is also one of the largest such regions in the Local Group with an estimated diameter of 200 pc.
30 Doradus has at its centre the star cluster NGC 2070 which includes the group of stars known as R136. This group puts out most of the energy that makes the nebula visible. The estimated mass of the cluster is 450,000 solar masses. It may become a globular cluster in the future.
In addition to NGC 2070, the Tarantula nebula has other star clusters, including the much older Hodge 301. The most massive stars of Hodge 301 have already exploded in supernovae. The closest supernova observed since the invention of the telescope, Supernova 1987A, occurred in the outskirts of the Tarantula Nebula. The remnants of many other supernovae are difficult to detect in the complex nebulosity.