File:Comparison of Hubble and Webb views of a Cepheid variable star (weic2408b).jpg
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[edit]DescriptionComparison of Hubble and Webb views of a Cepheid variable star (weic2408b).jpg |
English: At the centre of these side-by-side images is a special class of star used as a milepost marker for measuring the Universe’s rate of expansion — a Cepheid variable star. The two images are very pixelated because each is a very zoomed-in view of a distant galaxy. Each of the pixels represents one or more stars. The image from the James Webb Space Telescope is significantly sharper at near-infrared wavelengths than Hubble (which is primarily a visible-ultraviolet light telescope). By reducing the clutter with Webb’s crisper vision, the Cepheid stands out more clearly, eliminating any potential confusion. Webb was used to look at a sample of Cepheids and confirmed the accuracy of the previous Hubble observations that are fundamental to precisely measuring the Universe’s expansion rate and age.[Image description: A horizontal two-panel image of pixelated, black-and-white star fields. The left image is labelled Webb Near-IR and has a few dozen points of light of varying brightness. At the centre of the image, one bright point is circled. The right image is labelled Hubble Near-IR and has more indistinct, blurry patches whose overall brightness is similar to the more defined regions in the left image. At the centre, a light grey pixel is circled.] |
Date | 11 March 2024 (upload date) |
Source | Comparison of Hubble and Webb views of a Cepheid variable star |
Author | NASA, ESA, CSA, STScI, A. Riess (JHU/STScI) |
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[edit]ESA/Webb 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 webbtelescope.org website, use the {{PD-Webb}} tag.
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This file is licensed under the Creative Commons Attribution 4.0 International license.
Attribution: NASA, ESA, CSA, STScI, A. Riess (JHU/STScI)
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current | 11:51, 14 March 2024 | 1,298 × 726 (125 KB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://cdn.esawebb.org/archives/images/large/weic2408b.jpg via Commons:Spacemedia |
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Author | Space Telescope Science Institute Office of Public Outreach |
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Credit/Provider | NASA, ESA, CSA, STScI, A. Riess (JHU/STScI) |
Source | ESA/Webb |
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Date and time of data generation | 15:00, 11 March 2024 |
Software used | Adobe Photoshop 25.3 (Macintosh) |
File change date and time | 12:24, 4 March 2024 |
Date and time of digitizing | 10:10, 30 August 2022 |
Date metadata was last modified | 07:50, 4 March 2024 |
Unique ID of original document | xmp.did:0445b009-629a-4a78-a3fd-386f55d48911 |
Copyright status | Copyright status not set |
Keywords | NGC 5468 |
Contact information | outreach@stsci.edu
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr Baltimore, MD, 21218 United States |
IIM version | 4 |