(Shuttle Mission: STS-31)
Shuttle: Discovery
Date: April 24-29, 1990

• April 25, 1990: Hubble Space Telescope deployed into orbit.


• June 25, 1990: Spherical aberration discovered in Hubble's primary mirror


• Later in the year COSTAR (Corrective Optics Space Telescope Axial Replacement) was approved. COSTAR was a complex packaging of five optical mirror pairs which would rectify the spherical aberration in Hubble's primary mirror.