#asteroids
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The Outer Solar System and Life
Sagan's second Royal Institution Christmas Lecture in the 1977 'Planets' series, on the giant planets and the search for life.
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The Earth as a Planet
Sagan's first Royal Institution Christmas Lecture in the 1977 'Planets' series, broadcast on BBC2 in early 1978.
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Comets and the Origin of Life
The inaugural Thompson Leadership Lecture at IMSA — Sagan on comets and the origin of life, calling the academy 'a gift from the people of Illinois to the human future.'
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