Carl Sagan was probably the most well-known scientist of the 1970s and 1980s. He studied extraterrestrial intelligence, advocated for nuclear disarmament, and co-wrote and hosted 'Cosmos: A Personal Voyage.'
Astronomer Edwin Hubble revolutionized the field of astrophysics. His research helped prove that the universe is expanding, and he created a classification system for galaxies that has been used for several decades.
Caroline Lucretia Herschel assisted her brother, Sir William Herschel, with scientific research, but became a respected astronomer in her own right. She earned a gold medal from the Royal Astronomical Society in 1828.