In this image, taken by the Hubble Space Telescope, you can see Messier 79 (NGC 1904), a globular star cluster in the constellation of Lepus (The Hare, https://goo.gl/zGO0Vb), about 40,000 light-years away from Earth.
While only 120 light-years in diameter, it contains about 150,000 stars. It is possible that Messier 79 was caught by our Milky Way Galaxy from the Canis Major Dwarf Galaxy (https://goo.gl/SXYxP2), a dwarf galaxy that is currently in the process of being absorbed by the Milky Way.
Messier 79 was discovered in _1780_by the French astronomer Pierre Méchain (https://goo.gl/cGcCMS).
What is a globular cluster?
A globular cluster is a spherical collection of up to millions of stars held together by their own gravitational forces and orbiting a galaxy core as a satellite. They have very high stellar densities at their core. More information here: