Carl Sagan – 50 years of space exploration

Today, November 9-th, is the birthday of Carl Sagan, an astronomer, author and highly successful popularizer of astronomy, astrophysics and other natural sciences. Here is a tribute video for him.

Btw, today is also the birthday of Hang, a frequent editor of haha.nu, and a special person for me. So, happy birthday to her . -Quang-

@ haha.nu

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