Astronomer Richard Walker discovered Saturn's moon, Epimetheus.
Cosmonaut Alexey Leonov made the first spacewalk when he left his Voskhod 2 spacecraft.
The USSR's Voskhod 1 spacecraft became the first spaceflight with multiple crew members.
Cosmonaut Valentina Tereshkova became the first woman in space.
The Soviet Union launched its second reconnaissance satellite, Kosmos 4.
The Mariner 1 Space Probe was forced to self-destruct minutes after launching.
Pakistan established its national space agency, the SUPARCO.
Alan Shepard became the first American to travel to outer space.
The world's first person visited space.
A chimpanzee named Ham became the first primate to go to space aboard the US MR-2 spacecraft.
Sputnik 1 became Earth's first artificial satellite to go into orbit.
The US launched the first monkey into space aboard a V2 sounding rocket.
Pluto was officially named.
American astronomer Clyde Tombaugh discovered Pluto.
Astronomer Edwin Hubble formally announced the existence of other galactic systems at a meeting of the American Astronomical Society.
The New York Times published Edwin Hubble's discovery that the Andromeda 'nebula' is actually a galaxy.
Carl Gustav Witt discovered the first near-Earth asteroid, 433 Eros.
American Astronomer William Henry Pickering discovered Phoebe, one of Saturn's moons.
Asteroid 323 Brucia became the first asteroid discovered using photography.
Italian astronomer Giovanni Donati became the first person to observe the spectrum of a comet.
Alvan Graham Clark discovered the white dwarf star Sirius B.
George Mary Searle discovered the asteroid 55 Pandora.
Frederick Langenheim took the first photo of a solar eclipse.
British astronomer William Lassell discovered Neptune's largest moon, Triton.
The galaxy Centaurus A was discovered by Scottish astronomer James Dunlop.
German Astronomer Karl Ludwig Harding discovered the 3 Juno asteroid in the Asteroid Belt.
The dwarf planet Ceres was discovered by an Italian monk called Giuseppe Piazzi.
Astronomer William Herschel first observed Uranus.
William Herschel discovered the first binary star.
Charles Messier discovered the Whirlpool Galaxy.
Dutch astronomer Johannes Fabricius discovered sunspots.
Kepler's Supernova was discovered.
Danish astronomer Tycho Brahe witnessed the supernova SN 1572.
Astronomer Nicolaus Copernicus made his first observation of Saturn.
The final gasps of the Crab Head nebula were observed as it went supernova.
Chinese astronomers reported the brightest supernova known to man.
