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October 4, 1957 - Sputnik 1, the first man-made object to orbit the Earth, is launched by the U.S.S.R., and remains in orbit until January 4, 1958.
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November 3, 1957 - Sputnik 2, carrying the dog Laika for 7 days in orbit, is launched by the U.S.S.R., and remains in orbit until April 13, 1958.
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October 1, 1958 - N.A.S.A. is founded, taking over existing National Advisory Committee on Aeronautics.
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January 2, 1959 - Luna 1, first man-made satellite to orbit the moon, is launched by the U.S.S.R.
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September 12, 1959 - Luna 2 is launched, impacting on the moon on September 13 carrying a copy of the Soviet coat of arms, and becoming the first man-made object to hit the moon.
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April 12, 1961 - Vostok 1 is launched by the U.S.S.R., carrying Cosmonaut Yuri A. Gargarin, the first man in space. He orbits the Earth once.
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June 16, 1963 - Vostok 6 carries Soviet Cosmonaut Valentia Tereshkova, the first woman in space and orbits the Earth 48 times.
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March 18, 1965 - The first space walk is made from Soviet Voskhod 2 by Cosmonaut Alexei A. Leonov. Duration is 12 minutes.
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November 16, 1965 - Soviet Venus 3 is launched, becoming the first craft to impact Venus on March 1, 1966.
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February 3, 1966 - Soviet Luna 9 is the first spacecraft to soft-land on the moon.
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March 1, 1966 - Soviet Venera 3 impacts on Venus, the first spacecraft to reach another planet. It fails to return data.
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July 20, 1969 - Neil Armstrong and Edwin Aldrin, Jr. make the first manned soft landing on the Moon, and the first moonwalk, using Apollo 11.
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January 31, 1971 - Apollo 14 moon mission is launched by the U.S. with the legendary Alan Shepard, along with Stuart Roosa and Edgar Mitchell on board. They land in the planned Apollo 13 site, the Fra Mauro highlands, which they explore with the help of a two-wheeled cart that permits the transport of a significantly greater quantity of lunar material than previous missions. Shepard becomes the first man to hit a golf ball on the moon.
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July 30, 1971 - Apollo 15 astronauts David Scott and James Irwin drive the first moon rover. The next year, Apollo 17 astronaut Harrison Schmitt drives a similar rover.
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December, 1972 - Scientists designate Cignus X-1 as the first probable black hole.
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American Mariner 10 is launched, on the first dual-planet mission. Over the next year, it returned photographs of Venus and Mercury.
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October, 1975 - Soviet Venera 9 and 10 send the first pictures of the Venusian surface to Earth.
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September 3, 1976 - Viking 2 lands on Mars on the Plain of Utopia, where it discovered water frost.
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March 1, 1982 - Venera 13 lands on Venus, and provides the first Venusian soil analysis
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June 19, 1983 - Sally K. Ride is the first U.S. woman to travel in space, on Challenger mission STS-7.
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January 28, 1986 - The space shuttle Challenger explodes shortly after liftoff of mission STS-51L.
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February 6, 1995 - Space shuttle Discovery maneuvers to within 37 feet of Russian space station Mir, in preparation for a shuttle-Mir docking (STS-63). This is the first shuttle mission to be flown by a female pilot.
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March 23, 2001 - fifteen years after its first launch, and after nearly 10 years of continuous occupation by astronauts, the Mir space station is de-orbited, breaking up in the atmosphere and impacting in the Pacific Ocean.
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Space shuttle Atlantis launches on the final flight of the space shuttle program.