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Explanation: Is the gravity of the above galaxies high enough to contain the glowing hot gas? Superposed on an optical picture of a group of galaxies is an image taken in X-ray light. The X-ray picture, taken by ROSAT, shows confined hot gas highlighted in false red color, and provides clear evidence that the gravity exerted in groups and clusters of galaxies exceeds all the individual component galaxies combined. The extra gravity is attributed to dark matter, the nature and abundance of which is the biggest mystery in astronomy today.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: hot gas - dark matter
Publications with words: hot gas - dark matter
See also:
- APOD: 2024 October 20 Á Dark Matter in a Simulated Universe
- APOD: 2024 January 1 Á NGC 1232: A Grand Design Spiral Galaxy
- Dark Matter in a Simulated Universe
- Sonified: The Matter of the Bullet Cluster
- Grand Spiral Galaxy NGC 1232
- The Matter of the Bullet Cluster
- Space Station Detector Finds Unexplained Positron Excess