Science Fair Project Encyclopedia
BL Lacertae
BL Lacertae or BL Lac is a highly variable, extragalactic AGN (Active Galactic Nuclei or Active galaxy) originally thought to be an irregular variable star in our own galaxy and so was given a variable star designation. In the 1970s the "star" was identified with a bright, variable radio source and a faint trace of a galaxy was found.
It is the original member of a type of blazar known as "BL Lacertae objects," also termed simply "BL Lac objects."
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details


