Helix Nebula

The Helix Nebula (NGC 7293) is a planetary nebula located in the constellation Aquarius, approximately 650 light-years from Earth. It is one of the largest known planetary nebulae, spanning about two-thirds the angular size of the Moon.1

Planetary nebulae are expanding shells of luminous gas expelled by dying stars. They are relatively small, typically about one light-year in radius, and contain about 0.3 solar masses of gas. The Helix Nebula, like other planetary nebulae, is formed when a star reaches the end of its life, ejecting its outer layers. These ejected gases are then ionized by the hot, central core of the dying star, causing them to glow. The nebula's appearance is often ring-like, with bright material forming lobes connected by a bridge.1

The Helix Nebula is a significant source of gas for the interstellar medium. Its study helps astronomers understand the late stages of stellar evolution and the chemical enrichment of galaxies.1