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Explanation: Elliptical galaxy NGC 720 is enveloped in a cosmic cloud of x-ray emitting gas. Seen in this false color image from the Chandra X-ray Observatory, the extreme temperature of the gas - about 7 million degrees Celsius - makes it impossible to confine the cloud to the vicinity of NGC 720 based on the gravity of this galaxy's visible stars alone. In fact, the x-ray cloud is taken as solid evidence for the presence of dark matter surrounding NGC 720 -- unseen material which has gravitational influence that can keep the x-ray hot gas cloud from escaping. Chandra's remarkable vision clearly distinguishes the bright point-like x-ray sources from the diffuse cloud. Astronomers can then use the detailed shape of the cloud to infer the distribution of dark matter in NGC 720 and even test theories about the fundamental nature of dark matter. According to modern understanding, the mysterious dark matter, whatever it is, is by far the most common form of matter in the Universe. Galaxy NGC 720 lies about 80 million light-years distant toward the constellation Cetus.
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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: dark matter - NGC 720
Publications with words: dark matter - NGC 720
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