1-Carl Edward Sagan
Carl Edward Sagan, born on 09 November 1934, is considered the most notable astronomer of America. He is not only an astronomer but also astrobiologist, cosmologist, author, astrophysicist, science communicator not only in astronomy but also in other natural sciences, and a science popularizer. Carl Sagan always promoted the scientific method and also scientific skeptical inquiry, he also advocated the "Search for Extra-Terrestrial Intelligence".
2-Neil deGrasse Tyson
Neil deGrasse Tyson, born on 05 October 1958, is regarded as second greatest and famous astronomer of America. He is basically an eminent American cosmologist, author, astrophysicist, science communicator in astronomy. Neil deGrasse Tyson has been at the " Rose Center for Earth and Space" as a 'Frederick P. Rose Director' of the "Hayden Planetarium" since 1996, he also founded a great "Department of Astrophysics".
3-Edwin Hubble
Edwin Powell Hubble, born on 20 November 1889, comes on the number three in our list of the most notable astronomers of America. He is not only one of the greatest American astronomers but he is also widely regarded as one of the best observational cosmologists of the twentieth century. Edwin Powell Hubble is best known for his most important role in promoting the field of the "Extragalactic Astronomy".
4-Henrietta Swan Leavitt
Henrietta Swan Leavitt, born on 04 July 1868, is also included in our list of the greatest and best astronomers of America. She was such a great American astronomer who played a crucial role in discovering the relation between the period of 'Cepheid variable stars' and the luminosity, due to his discovery the astronomers are able to measure the distance between the faraway galaxies and the Earth.
5-Samuel Pierpont Langley
The fifth greatest and notable American astronomer of all time Samuel Pierpont Langley, born on 22 August 1834. He was not only an eminent American astronomer but also an inventor of the biometer, physicist, he also pioneered aviation. Samuel Pierpont Langley also founded the "Smithsonian Astrophysical Observatory" and did a great job in the field astronomy, he died on 27 February 1906.
6-George Driver Nelson
George Driver Nelson, born on 13 July 1950, is regarded as the sixth most notable and best astronomer of America of all time. He is not only an eminent American astronomer but also a former NASA astronaut, science educator and physicist. George Driver Nelson performed his great astronomical research at the Peak Solar Observatory, Sacramento, his recent research is in the preparation of science teachers.
7-Colin Michael Foale
Colin Michael Foale, born on 06 January 1957, is considered the seventh greatest and most notable astronomer of America of all time. He is basically a British-American famous astrophysicist, a veteran of 6 "Space Shuttle missions" and also a retired NASA astronaut. Colin Michael Foale was the 1st Briton who had performed a spacewalk, moreover, he also held the record of spending the most time in space as a US citizen.
8-David Rittenhouse
David Rittenhouse, born on 08 April 1732, comes on the number eight in our list of the most notable and best astronomers of America of all time. He was not only a well-known American astronomer but also a famous clockmaker, surveyor, inventor, scientific instrument craftsman, mathematician and a public official. David Rittenhouse was the 1st director of the " United States Mint", he died on 26 June 1796.
9-Tom Gehrels
Tom Gehrels, born on 21 February 1925, is also included in our list of the most notable and best astronomers of America of all time. He was basically a Dutch–American famous astronomer. Tom Gehrels invented the asteroid's first photometric system in 1950, he also performed his duties as an astronomer and Professor of Planetary Sciences at the "University of Arizona",he died on 11 July 2011.
Lastly, I am going to share with you some information about another great and notable American astronomer of all time and that is Benjamin Banneker, born on 09 November 1731. He was basically a free African American famous "almanac author", naturalist, surveyor and also a farmer. Benjamin Banneker had a great knowledge of astronomy that's why he wrote a successful series of "almanacs", he died on 09 October 1806.
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