The Helix Nebula, a favorite target for amateur astronomers, is one of the closest planetary nebulae to Earth. Planetary nebulae are shells of gas expelled by dying stars.
Explore the science along with the scenery – Image Tours show Hubble pictures through an astronomer's eyes, pinpointing and explaining key features to add understanding to the joy of cosmic sightseeing.
A New Twist on an Old Nebula
Publication: March 21, 2006