1915 NACA, the predecessor of NASA, is founded.
1958 NASA is created to replace NACA.
1962 NASA "Relay 1" launch, first active repeater communications satellite in orbit.
1966 One of the XB-70 Valkyrie prototypes is destroyed in a mid-air collision with a F-104 Starfighter chase plane during a photo shoot. NASA pilot Joseph A. Walker and United States Air Force test pilot Carl Cross are both killed.
1966 NASA launches Gemini 12.
1968 Apollo program: NASA launches Apollo 6.
1980 The NASA space probe ''Voyager I'' makes its closest approach to Saturn and takes the first images of its rings.
1982 NASA launches the Intelsat V-508 satellite.
1992 NASA launches Space Shuttle ''Endeavour'' on STS-47 which marked the 50th shuttle mission. On board are Mae Carol Jemison, the first African-American woman in space, Mamoru Mohri, the first Japanese citizen to fly in a US spaceship, and Mark Lee and Jan Davis, the first married couple in space.
1993 NASA loses contact with the Mars Observer spacecraft.
1996 NASA announces that the ALH 84001 meteorite, thought to originate from Mars, contains evidence of primitive life-forms.
1996 NASA launches the Mars Global Surveyor.
1999 NASA announces that it has lost contact with the Mars Climate Orbiter.
2002 The last successful telemetry from the NASA space probe Pioneer 10.
2004 NASA's MER-A (the Mars Rover ''Spirit'') ceases communication with mission control. The problem lies in the management of its flash memory and is fixed remotely from Earth on February 6.
2004 NASA's unmanned spacecraft ''Genesis'' crash-lands when its parachute fails to open.
2005 STS-114: NASA grounds the Space Shuttle, pending an investigation of the continuing problem with the shedding of foam insulation from the external fuel tank. During ascent, the external tank of the Space Shuttle Discovery sheds a piece of foam slightly smaller than the piece that caused the Space Shuttle Columbia disaster; this foam does not strike the spacecraft.
2007 NASA's Phoenix spaceship is launched.