Udo had the best and most effervescent personality of anyone I have ever known, what a legend! An absolutely unforgettable character, I can’t believe he is gone, I miss his cheeky face and grin so much, his wit and humour, so grateful for all the great memories, moments and laughs we shared. 😢💕
As an advisor to NASA, Sagan helped design and manage the Mariner 2 mission to Venus, the Mariner 9 and Viking trips to Mars, the Voyager system to the outer solar system, and the Galileo mission to Jupiter. He also helped brief astronauts prior to their trips to the moon.