View the NASA editor's choices for the most educational Astronomy Pictures of the Day about planetary nebulae.

Guide to planetary nebulae explains their formation, lifespan and thermal pulsing. Explore a gallery of images of planetary nebulae.

Start with a brief description of planetary nebulae, and proceed with images of several rather unusual examples.

Essay links the study of planetary nebulae to the future of our solar system. Includes Hubble Space Telescope images and related links.

Resource dedicated to planetary nebulae. Find observation reports and tips, an image gallery, a nebula database, and filter information.

Students for the Exploration and Development of Space offers this introduction to planetary nebulae. Includes images and object data.

Dive into a sample gallery of a number of planetary nebulae that the Hubble Space Telescope has observed.

Paper from Electronic Publications of the Astronomical Society of Australia covers the discovery of two new planetary nebulae and an AGN.

Learn about a program to find and analyze close binary central stars, non-radially pulsating central stars and semi-regular central stars.