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Galaxy groups and clusters	List of galaxy groups and clusters
Observation data (Epoch J2000)
Constellation(s):	Perseus
Right ascension	03hh 18m<ref name="ned">NASA/IPAC Extragalactic Database. Results for Perseus Cluster. Retrieved on 2006-11-28.</ref>
Declination	+41° 30′<ref name="ned" />
Number of galaxies:	190<ref name="ned" />
Brightest member:	NGC 1275
Other designations
Abell 426,<ref name="ned" /> NGC 1275 Cluster,<ref name="ned" />

The Perseus Cluster (Abell 426) is a cluster of galaxies in the constellation Perseus. It has a red shift of 5,366 km/s and a diameter of 863′.<ref name="ned" />

In 2003, astronomers detected the deepest note ever generated in the cosmos, a B-flat. No human will actually hear the note, because it is 57 octaves below the keys in the middle of a piano. After 53 hours of Chandra observations, it was revealed that the detected note is more than 1,000,000,000,000,000 times deeper than what humans are able to hear. The reason the sound was detected was because the sound waves were heating gas in the Perseus galaxy cluster, some 250 million light-years away.

[edit] References

• The galaxy cluster Abell 426 (Perseus). A catalogue of 660 galaxy positions, isophotal magnitudes and morphological types, Brunzendorf, J.; Meusinger, H., Astronomy and Astrophysics Supplement, v.139, p.141-161, 1999.

• Space.com article about "Sound of a Black Hole." in the Perseus Cluster

sk:Kopa galaxií Perzeus