1978: August 8th is the 40th Anniversary of the Pioneer Venus 1978 Launch. 

1998: August 6th is the 20th Anniversary of the Pathfinder-Plus solar-powered aircraft flying to record altitude. 

2008: July 30th is the 10th Anniversary of Cassini confirming a lake on Titan. 

1958: July 29th is the 60th Anniversary of President Eisenhower signing the national Aeronautics and Space Act. 

1973: July 28th is the 45th Anniversary of the second Skylab crew launch. 

1963: July 26th is the 55th anniversary of the Syncom 2 launch, the first GEO comsat. 

2003: July 7th is the 15th Anniversary of the MER-B/Opportunity Launch. 

1993: July 1st is the 25th anniversary of the Hubble Space Telescope imaging Comet Shoemaker-Levy 9 fragments. 

1978: June 26th is the 40th Anniversary of the SeaSat A Launch. 

1993: June 21st is the 25th Anniversary of the STS-57 Launch and the  Spacehab Module's first flight.