'My candidate for planetary ambassador can be none other than Carl Sagan himself. He is wise, humane, polymathic, witty, well read, and incapable of composing a dull sentence.' Richard Dawkins, THE TIMES
'No other scientist of our century has matched the great breadth of imagination, erudition and prolific accessibility of Professor Carl Sagan. Through his books, his great clarity of mind and amazing energy, he touched and enlarged all of us.' GUARDIAN
'Inspiring millions with his writings and broadcasts was just one of his many talents ... If we do manage to find our way, it will be thanks to the efforts of Carl Sagan.' INDEPENDENT