Portal:Astronomy/Picture/30 August 2005
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/12/Improvement_in_Hubble_images_after_SMM1.jpg/300px-Improvement_in_Hubble_images_after_SMM1.jpg)
The Hubble Space Telescope's main mirror was accidentally ground incorrectly, resulting in a spherical aberration which severely degraded the image quality obtainable with the telescope. Space Shuttle mission STS-61 installed corrective optics on the telescope, the effect of which can be seen in these 'before and after' images of the spiral galaxy M100