Review the details below.
Dr. Carl Sagan wrote a highly popular companion book for the series Cosmos, as well as the follow-up book Pale Blue Dot: A Vision of the Human Future in Space.
As an astronomy and space sciences professor at Cornell University, Dr. Carl Sagan edited a scientific journal, published books, and appeared frequently as a guest on late-night talk shows.
Dr. Carl Sagan was the co-host and co-writer of Cosmos: A Personal Voyage, a thirteen-part PBS series watched by 750 million people.
Choose the best topic sentence to introduce a paragraph containing these details.