Carl Sagan

Carl Sagan discovered life on Earth 30 years ago - how his experiment helps us look for alien species today

It has been 30 years since a group of scientists led by Carl Sagan found evidence of life on Earth using data from instruments aboard NASA's Galileo space probe and only combining instruments while ignoring existing knowledge made this possible

Neil deGrasse Tyson, presenter of the Cosmos series: "If Sagan were alive, he would be most surprised by the fact that we still have to argue that science is important to society."

Witch hunt - definitely not Halloween

Did Carl Sagan believe in God?

NASA will award a Carl Sagan Fellowship for the study of planets outside the solar system

The parable of human evolution

Knowledge is our destiny: Intelligence on Earth and beyond

Sunday Sermon/Carl Sagan

In praise of science and technology

Can we know the universe? Reflections on a grain of salt

Carl Sagan died at the age of 62 after a two-year battle with cancer

Recommendation for a new book: Billions and Billions - Carl Sagan's latest book

The universe of the benign

Carl Sagan on: The Colliding Worlds of Immanuel Volikovsky

Carl Sagan on: The Colliding Worlds of Immanuel Volikovsky Part II

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Did Carl Sagan believe in UFOs

Carl Sagan on... a personal view

Gullible will believe anything