File:Bullet cluster.jpg
Original file (1,056 × 816 pixels, file size: 802 KB, MIME type: image/jpeg)
|
This is a file from the Wikimedia Commons. The description on its description page there is shown below.
|
| Description |
X-ray photo by Chandra X-ray Observatory of the Bullet Cluster (1E0657-56). Exposure time was 0.5 million seconds (~140 hours) and the scale is shown in megaparsecs. Redshift (z) = 0.3, meaning its light has wavelengths stretched by a factor of 1.3. Based on today's theories this shows the cluster to be about 4 billion light years away. In this photograph, a rapidly moving galaxy cluster with a shock wave trailing behind it seems to have hit another cluster at high speed. The gases collide, and gravitational fields of the stars and galaxies interact. When the galaxies collided, based on black-body temperture readings, the temperature reached 160 million degrees and X-rays were emitted in great intensity, claiming title of the hottest known galactic cluster. Studies of the Bullet cluster, announced in August 2006, provide the best evidence to date for the existence of dark matter. Sister picture: image:bullet_cluster_lensing.jpg |
| Date | |
| Source | http://cxc.harvard.edu/symposium_2005/proceedings/files/markevitch_maxim.pdf |
| Author | User:Mac_Davis |
| Permission (Reusing this file) |
Original work of NASA - public domain |
|
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
 |
Warnings:
|
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 12:57, 26 April 2019 | 1,056 × 816 (802 KB) | FriedrichKieferer | Better resolution and quality. |
File usage
The following page uses this file:
