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Research Scientist, SETI Institute and NASA Ames Research Center
In your field of work, what are some examples of the great achievements and discoveries in planetary science and robotic exploration throughout the past 50 years?
In my field, the most significant robotic mission was the Stardust mission to comet Wild 2. By bringing back particles of the comet, we learned that comets are not that fundamentally different from outer belt asteroids. That opened up new ideas about the formation and early evolution of the solar system.
What do you think are the most significant events that have occurred in the past fifty years of robotic planetary exploration? Why?
Going back further in time, ESA's Giotto mission to comet 1P/Halley was a milestone, showing for the first time that comets have nuclei. This was the first time a spacecraft came close enough to look through the fog surrounding a comet. Hard to believe that was only in 1986.
I would also rate the Epoxi mission high on the list, mainly because of its flyby of comet Hartley 2. What a great view of an active comet nucleus. Also, the first direct evidence of CO2 driven ejection of ice-laden dust in hyperactive comets is high on my list of favorites.
Of course, the Tempel 1 impact made a big splash also.