Two new moons of Saturn were found in photos from the Hubble Space Telescope by Astronomers Amanda S. Bosh and Andrew S. Rivkin.
The population of space hit a new record with 13 astronauts.
Gliese 229B became the first brown dwarf to be seen and identified by astronomers.
A galaxy named 'Dwingeloo 1' was discovered to be just 10 million light-years from our own.
Russian cosmonaut Valeri Polyakov begins his record spaceflight.
Carolyn & Eugene Shoemaker and David Levy discovered the Shoemaker-Levy 9 comet.
Pioneer Venus Orbiter, or Pioneer 12, sent its last transmission as it fell from its orbit around Venus.
A large explosion above the Pacific Ocean turned out to be a meteorite.
The asteroid Eureka was discovered by David H. Levy.
Pale Blue Dot, an iconic photo of our Earth, was taken by Voyager 1 space probe.
Halley's Comet was last seen from Earth. It only orbits the Earth once every 75 to 76 years.
NASA astronauts take the first untethered spacewalk.
Cosmonauts Titov and Strekalov narrowly escaped the Soyuz T-10 spacecraft explosion.
The first Hughes Communications Galaxy satellite was launched into orbit.
All nine planets (including Pluto) lined up with the sun.
Many volcanoes were discovered on one of planet Jupiter's moons called Io.
United States Naval Observatory astronomer James Christy discovered Pluto's largest moon.
Ohio State University's Big Ear radio telescope detected a deep-space radio signal.
The Space Shuttle takes off on its maiden flight.
The Viking 2 became the second spacecraft to land on Mars.
Mariner IX took two photos of Mars' north pole.
The US spacecraft Pioneer 10 launched.
The mapping of Mars' surface began.
The National Oceanic and Atmospheric Administration's ITOS-B weather satellite launched atop a Delta rocket.
Astronauts on Apollo 15 discovered a rock that could date back to the birth of the moon.
The US Mariner 9 was launched – it went on to become the first satellite to orbit Mars.
Astronaut Alan Shepard was the first to hit a golf ball on the Moon.
The Apollo 11 astronauts were released from a three-week quarantine following their liftoff from the moon.
Apollo 11 landed on the Moon with astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins.
Robert H. Lawrence, Jr. was selected as the first African-American astronaut.
The Outer Space Treaty was signed to prevent the use of nuclear weapons being utilized in space.
Astronomer Richard Walker discovered Saturn's moon, Epimetheus.
The Venera 3 space probe became the first human-made object to land on another planet.
Luna 9 touches down on the Moon.
The first weather satellite (ESSA-1) was launched into orbit from Cape Canaveral, Florida.
The Gemini V spacecraft returned to Earth, landing in the Atlantic Ocean.
The idea of the Big Bang Theory being the creation of the universe was supported by scientists.
Cosmonaut Alexey Leonov made the first spacewalk when he left his Voskhod 2 spacecraft.
Cosmonaut Valentina Tereshkova became the first woman in space.
Scott Carpenter orbited the Earth three times in the US Aurora 7.
Enos, the chimpanzee, was launched into space on the Mercury-Atlas 5 Mission.
US President John F. Kennedy addressed Congress and promised to put a man on the moon within a decade.
The US Air Force launched the Discoverer 1 reconnaissance satellite.
Luna 1 is launched.
Sputnik 1 falls to Earth from orbit.
Sputnik 1 became Earth's first artificial satellite to go into orbit.
A V-2 rocket captured the first photograph of Earth from outer space.
Pluto was officially named.
American astronomer Clyde Tombaugh discovered Pluto.
Robert Goddard launched his second liquid-fueled rocket.
