Object Analysis

The Ring Nebula (Messier 57) is a planetary nebula in the northern constellation of Lyra. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star at the end of its life. It is one of the most prominent examples of a planetary nebula and is a favorite target for amateur astronomers.

The nebula appears as a distinct, donut-like shape. The central star is a white dwarf with a temperature of approximately 125,000 Kelvin. The colors seen in photographs are stratified: the inner blue region is the hottest helium, the green is ionized oxygen, and the outer red ring is hydrogen. This structure provides a glimpse into the future of our own Sun, which is expected to shed its outer layers in a similar fashion in about 5 billion years.

Discovered by Antoine Darquier de Pellepoix in 1779, the Ring Nebula is located about 2,500 light-years from Earth. While it looks like a ring from our perspective, modern 3D modeling suggests it is actually a bipolar nebula—more like a cylinder or hourglass viewed almost directly down the barrel.