Dr Carl Sagan remembered - Visionary, philosopher and charismatic speaker, an inspiration to to his generation

The late, great Dr Carl Sagan, a professor of astronomy and space science at Cornell University and an adviser to Nasa, played a major role in setting up Seti, the Search for Extra-Terrestrial Intelligence.

However, he is probably best known to the public for the television series Cosmos: A Personal Voyage, and his books Pale Blue Dot and The Demon-Haunted World: Science as a Candle in the Dark.

As well as his research, he was a major science advocate and populariser, and a vociferous supporter of scepticism and rationality.

He was a visionary, philosopher and charismatic speaker, an inspiration to to his generation and hopefully, those that come on behind. A truly great human being and one that is sorely missed.