> "Working with the LST science groups and contractors, the team reduced the telescope’s primary mirror from a 3-meter aperture to 2.4 meters. This major change

> "Working with the LST science groups and contractors, the team reduced the telescope’s primary mirror from a 3-meter aperture to 2.4 meters. This major change mainly resulted from new NASA estimates of the Space Shuttle’s payload delivery capability; the Shuttle could not lift a 3-meter telescope to the required orbit. In addition, changing to a 2.4-meter mirror would lessen fabrication costs by using manufacturing tech- nologies developed for military spy satellites." https://web.archive.org/web/20161130130303/http://history.msfc.nasa.gov/book/chpttwelve.pdf https://web.archive.org/web/20161130130303/http://history.ms... Hubble's mirror is probably the same [size] as a KH-11: https://en.wikipedia.org/wiki/KH-11_Kennen#Size_and_mass https://en.wikipedia.org/wiki/KH-11_Kennen#Size_and_mass