The earth as a planet - Carl Sagan's 1977 Christmas Lectures 1/6

What exists beyond Earth? Over six Lectures presented in 1977, American astronomer and cosmologist Carl Sagan explores the vast expanse of space that surrounds the third planet from the Sun. This lecture was filmed at the Ri on Friday 02 Dec 1977. In his first CHRISTMAS LECTURE, American astronomer and cosmologist Carl Sagan explores planet Earth and the place, scale and geometry of the 'pale blue dot' in the Solar System.

Courtesy of The Royal Institution on YouTube. Watch on YouTube ↗

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