Comparative View of a Star Before and After the Installation of the Corrective Optics Space Telescope Axial Replacement (COSTAR)

This pair of images of a single star, taken with the European Space Agency's Faint Object Camera (FOC), demonstrate that NASA/ESA Hubble Space Telescope has been restored fully to its planned optical performance.

The COSTAR mirrors remove the effect of spherical aberration in the HST's primary mirror. The FOC will now be able to observe extremely faint celestial objects with a clarity and sensitivity unmatched by ground-based telescopes.


NASA, ESA, and the COSTAR Team

About the Image

NASA press release
NASA caption
Release date:13 January 1994, 16:30
Size:1024 x 768 px

About the Object

Name:FOC, Star
Type:• Unspecified : Star

Image Formats

Large JPEG
202.2 KB
Screensize JPEG
234.2 KB

Colours & filters

Ultraviolet Hubble Space Telescope

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