What Does COSTAR Stand For?

COSTAR stands for Corrective Optics Space Telescope Axial Replacement

COSTAR, or Corrective Optics Space Telescope Axial Replacement, was a critical instrument aboard the Hubble Space Telescope, designed to rectify the spherical aberration discovered in the telescope's primary mirror. Launched in 1993 during the first servicing mission, COSTAR utilized corrective optics to enhance image clarity and allow scientists to continue gathering actionable astronomical data until the installation of new instruments in later servicing missions. Its successful deployment marked a significant achievement in optical engineering and contributed to the ongoing legacy of Hubble's discoveries.