- Carl Sagan
 - Online memorial for Dr. Carl Sagan, the astronomer, educator, author, pioneer in exobiology, Director for Planetary Studies, and David Duncan Professor of Cornell University. - Carl Sagan - Wikipedia
- Article about Carl Edward Sagan, the American astronomer, astrobiologist, and highly successful science popularizer.
- Carl Sagan: Founder and First President of The Planetary Society
- Biography of Carl Sagan from The Planetary Society. They also offer a series of pages dedicated to the memory of Dr. Sagan, who passed away in 2006.
- Celebrating Sagan
- Celebrating Sagan is a nonprofit blog working to build a living memorial to remember the life of Dr. Carl Sagan.
- New York Times: Carl Sagan, an Astronomer Who Excelled at Popularizing Science, Is Dead at 62
- 1996 New York Times obituary for astronomer and author Carl Sagan.
- The Carl Sagan Portal
- Home of Carl Sagan Productions, the portal features a blog by Ann Druyan, information about the Carl Sagan Foundation, and other updates about the planetary sciences.
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