(November 5, 1906 - August 30, 2004)
Fred Lawrence Whipple was an American astronomer, who worked at the Harvard College Observatory for over 70 years. Amongst his achievements, he discovered some asteroids and comets, came up with the "dirty snowball" cometary hypothesis, and designed the Whipple shield.
(November 20, 1889 - September 28, 1953)
Edwin Powell Hubble was an American astronomer who profoundly changed the understanding of the universe by confirming the existence of galaxies other than our own, the Milky Way.
, American astronomer
(March 13, 1855 - November 12, 1916)
Percival Lawrence Lowell was a businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars, founded the Lowell Observatory in Flagstaff, Arizona, and formed the beginning of the effort that led to the discovery of Pluto 14 years after his death. The choice of the name Pluto and its symbol were partly influenced by his initials PL.
Garrett P Serviss
(March 24, 1851 - May 25, 1929)
Garrett Putnam Serviss was an astronomer, popularizer of astronomy, and early science fiction writer. Serviss was born in upstate New York, and majored in science at Cornell.