Optical Image of the BL Lac PKS 2155-304
The most variable type of active galaxy, which includes BL Lacertae objects and the most violently variable quasar.[1]
See also BL Lacertae objects, active galaxy and quasar.
References
- ^ Rees, Martin (ed.) (2008). Universe: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN 9780756636708.
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| group3 = Types of dark matter | abbr3 = 3 | list3 =
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