Image:CL0024+17.jpg
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| Description |
Astronomers using NASA's Hubble Space Telescope have discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two massive galaxy clusters. The ring's discovery is among the strongest evidence yet that dark matter exists. Astronomers have long suspected the existence of the invisible substance as the source of additional gravity that holds together galaxy clusters. Such clusters would fly apart if they relied only on the gravity from their visible stars. Although astronomers don't know what dark matter is made of, they hypothesize that it is a type of elementary particle that pervades the universe. This Hubble composite image shows the ring of dark matter in the galaxy cluster CL 0024+17. The ring-like structure is evident in the blue map of the cluster's dark matter distribution. The map was derived from Hubble observations of how the gravity of the cluster Cl 0024+17 distorts the light of more distant galaxies, an optical illusion called gravitational lensing. Although astronomers cannot see dark matter, they can infer its existence by mapping the distorted shapes of the background galaxies. The map is superimposed on a Hubble Advanced Camera for Surveys image of the cluster taken in November 2004. |
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| Source | |
| Date |
May 15, 2007 |
| Author |
NASA/ESA/HST |
| Permission (Reusing this image) |
Original work of NASA - public domain |
| Other versions | Image:Tmava hmota (Darkmatter).jpg |
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This file is in the public domain because it was created by NASA and the European Space Agency. Hubble material is copyright-free and may be freely used as in the public domain without fee, on the condition that NASA and ESA is credited as the source of the material. The material was created for NASA by STScI under Contract NAS5-26555 and for ESA by the Hubble European Space Agency Information Centre. [1] or [2]. |
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 01:36, 17 May 2007 | 1,280×1,280 (1.75 MB) | Clh288 | ({{Information |Description=Astronomers using NASA's Hubble Space Telescope have discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two massive galaxy clusters. The ring's discovery is among the strongest evide) |
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| Width | 3921 |
|---|---|
| Height | 3921 |
| Compression scheme | 5 |
| Pixel composition | RGB |
| Image title | IDL TIFF file |
| Orientation | Normal |
| Number of components | 3 |
| Horizontal resolution | 100 dpi |
| Vertical resolution | 100 dpi |
| Data arrangement | chunky format |
| Software used | Adobe Photoshop CS2 Macintosh |
| File change date and time | 12:07, 1 May 2007 |
| Color space | 65535 |
