Moseley, Henry Gwyn-Jeffreys (1887-1915), an English physicist. Moseley studied the X rays that an atom emits when it is bombarded by electrons. He discovered that there exists a relationship between the wavelengths of the X rays emitted by atoms of a particular chemical element and the element's atomic number. The discovery showed that atomic number is indicative of fundamental properties of a chemical element and helped establish atomic number in place of atomic weight as the basis of the periodic classification of the chemical elements. Moseley was born at Weymouth, and attended Eton and Oxford. He was a lecturer and did research under Ernest Rutherford. Moseley was killed in World War I.
He may have been born in Brooklyn, but Carl Sagan was gunning for the stars as soon as he arrived in this world. Get to know the scientist whose infectious delight in the universe still holds us spellbound.
He is famous for a phrase he never said, for wearing turtlenecks and for hosting the original 'Cosmos' TV series. As enthusiastic about the stars as he was about marijuana, Carl Sagan led a very surprising life. Here are 10 cool facts.