NGC 2261 is a variable reflection nebula located in the constellation Monoceros, at about 2.500 light-years away. The nebula is illuminated by the star R Monocerotis and it manifests ch...
The Cigar Galaxy (M 82) is an active galaxy located about 12 million light years away in the direction of the constellation Ursa Major. Its proximity to a larger galaxy (M 81) has cause...