Great Observatories — 15 museum-grade prints from the period. EULER GAMMA (Astrophysics, 2000) — Great Observatories lineage. Wallimilist NASA Missions prints are independent fan tribute art; not affiliated with NASA. The Hubble Space Telescope deployed 25 April 1990 and initially returned blurred images due to a primary mirror polishing error discovered weeks after launch. Servicing Mission 1 in December 1993 installed corrective optics that unlocked the observatory's full potential, producing Deep Field images that revised estimates of galaxy counts and universe age. FERMI GAMMA (Astrophysics, 2000) — Great Observatories lineage. Wallimilist NASA Missions prints are independent fan tribute art; not affiliated with NASA.