NGC 7331 and Stephan's quintet (Theodore Arampatzoglou)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320 · NGC 7331 · NGC 7335 · NGC 7337 · NGC 7340

NGC 7331 and Stephan's quintet, Theodore Arampatzoglou

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NGC 7331 and Stephan's quintet

Link: http://arasteo.blogspot.gr/2010/09/ngc-7331-and-stephans-quintet.html

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NGC 7331 and Stephan's quintet

Link: http://arasteo.blogspot.gr/2010/09/ngc-7331-and-stephans-quintet.html

The spiral galaxy NGC 7331, in Pegasus, can be seen with small telescopes under dark skies as a faint fuzzy spot. It is an island universe similar to our own Galaxy (or maybe somewhat larger) and placed at a distance of 50 million light-years. NGC 7331 was discovered by Wilhelm Herschel in 1784

Stephan's Quintet in the constellation Pegasus is the first identified compact galaxy group of five galaxies about 300 million light-years away. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. The group is the most studied of all the compact galaxy groups.

Recent infrared observations made with NASA's Spitzer Space Telescope have revealed the presence of a huge intergalactic shock wave, or "sonic boom" in the middle of Stephan's Quintet. This discovery, made by an international research team including scientists from the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg, provides a local view of what might have been going on in the early universe, when vast mergers and collisions between galaxies were commonplace.

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NGC 7331 and Stephan's quintet

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