Carl Sagan, the greatest astronomer!
Mr. Carl Sagan(1934¡ª1996), is the one who directed COSMOS: A Personal Voyage. COSMOS was one of the most famous TV programs, in 1980, about 500 million people in 60 countries watched it.And after that moment, Carl Sagan became a different kind of Super Star. He also wrote a lot of novels about universe. And his essays about science let a lot of kids be interested in science. So in this way, he was the greatest scientist.
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