File:25 years of stunning definition ESA19144507.tiff
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[edit]Description25 years of stunning definition ESA19144507.tiff |
English: This stunning spiral galaxy is Messier 100 in the constellation Coma Berenices, captured here by the NASA/ESA Hubble Space Telescope — not for the first time. Among Hubble’s most striking images of Messier 100 are a pair taken just over a month apart, before and after Servicing Mission 1, which took place 25 years ago in December 1993. After Hubble was launched, the astronomers and engineers operating the telescope found that the images it returned were fuzzy, as if it were out of focus. In fact, that was exactly what was happening. Hubble’s primary mirror functions like a satellite dish; its curved surface reflects all the light falling on it to a single focal point. However, the mirror suffered from a defect known as a spherical aberration, meaning that the light striking the edges of the mirror was not travelling to the same point as the light from the centre. The result was blurry, unfocused images. To correct this fault, a team of seven astronauts undertook the first Servicing Mission in December 1993. They installed a device named COSTAR (Corrective Optics Space Telescope Axial Replacement) on Hubble, which took account of this flaw of the mirror and allowed the scientific instruments to correct the images they received. The difference between the photos taken of Messier 100 before and after shows the remarkable effect this had, and the dramatic increase in image quality. COSTAR was in place on Hubble until Servicing Mission 4, by which time all the original instruments had been replaced. All subsequent instrumentation had corrective optics built in. This new image of Messier 100 taken with Hubble’s Wide Field Camera 3 (WFC3), demonstrates how much better the latest generation of instruments is compared to the ones installed in Hubble after its launch and after Servicing Mission 1. |
Date | 14 December 2018 (upload date) |
Source | 25 years of stunning definition |
Author | European Space Agency |
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Activity InfoField | Space Science |
Mission InfoField | Hubble Space Telescope |
Licensing
[edit]ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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This file is licensed under the Creative Commons Attribution 4.0 International license.
Attribution: NASA, ESA, CC BY 4.0
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current | 02:07, 21 August 2024 | 3,679 × 3,645 (31.79 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2018/12/25_years_of_stunning_definition/19144497-1-eng-GB/25_years_of_stunning_definition.tif via Commons:Spacemedia |
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Height | 3,645 px |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
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Horizontal resolution | 72 dpi |
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Software used | Adobe Photoshop CC (Windows) |
File change date and time | 17:02, 27 November 2018 |
Color space | sRGB |