NGC 1820 is a globular cluster located in the constellation of Taurus. It is approximately 30,000 light-years away from Earth and is part of the Milky Way galaxy. Globular clusters like NGC 1820 are dense collections of stars that are tightly bound by gravity, often containing hundreds of thousands of stars. Discovered by William Herschel in 1786, NGC 1820 is notable for its relatively high concentration of stars in a small area. It is classified as a type II globular cluster, indicating a specific distribution of stars and a more concentrated core compared to other types.