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Michael H. Hart is an American astrophysicist and essayist. He is best known for his book *The 100: A Ranking of the Most Influential Persons in History*, in which he argues that Muhammad was the most influential person in history. Hart has also written on the topic of extraterrestrial life, and has defended the idea that the universe is teeming with life. He is a controversial figure, and his views on race and religion have been criticized by some.

Here are some additional details about Michael H. Hart:

* Born on April 28, 1932, in New York City
* Received a B.A. in physics from Cornell University in 1952
* Earned a M.S. in astrophysics from Adelphi University in 1969
* Received a Ph.D. in astronomy from Princeton University in 1972
* Author of several books, including *The 100: A Ranking of the Most Influential Persons in History* (1978) and *A View from the Year 3000* (1999)
* A controversial figure due to his views on race and religion