Astronomy Picture of the Day

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zorg.ch
#49871 by @ 25.09.2004 00:00 - nach oben -
Fornax Cluster in Motion

Explanation: Reminiscent of popular images of the lovely Pleiades star cluster that lies within our own Milky Way Galaxy, this false-color x-ray view actually explores the center of a much more extended cosmic family -- the Fornax cluster of galaxies some 65 million light-years away. Spanning nearly 900,000 light-years, the Chandra Observatory composite image reveals high-energy emission from several giant galaxies near the Fornax cluster center and an immense, diffuse cloud of x-ray emitting hot gas. On the whole, the hot cluster gas seems to be trailing toward the upper left in this view. As a result, astronomers surmise that the Fornax cluster core is moving toward the lower right, encountering an intergalactic headwind as it sweeps through a larger, less dense cloud of material. In fact, along with another visible galaxy grouping at the outskirts of the cluster, the Fornax cluster core galaxies seem to be moving toward a common point, attracted by the dominating gravity of unseen structures of dark matter in the region.

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zorg.ch
#50020 by @ 26.09.2004 21:05 - nach oben -
döt wöt i emol anä. viel harti uv-strahlig, röntgästrahlig und starchi sonnästürm. än traum für alli wo wönd menschheit vernichtä...