1973: September 25th is the 45th Anniversary of the second Skylab crew landing. 

2003: September 21st is the 15th Anniversary of the Galileo mission ending at Jupiter. 

2008: August 18th is the 10th Anniversary of the first operational Cygnus Launch. 

2013: September 6th is the 5th Anniversary of the LADEE Launch. 

1983: August 30th is the 35th Anniversary of the STS-8 Launch with the first African-American in space 

2003: August 25th is the 15th Anniversary of the Spitzer Space Telescope. 

1963: August 22nd is the 55th Anniversary of the Highest X-15 flight. 

1958: August 19th is the 60th Anniversary of T. Keith Glennan sworn in as NASA's First Administrator. 

1978: August 12th is the 40th Anniversary of the ISEE 3 Launch. 

1993: August 10th is the 25th Anniversary of the Magellan Probe to complete its first aerobraking to change orbit (to enter science orbit at Venus).