History
John L. Schmitt first noticed the peculiar nature of BL Lac in 1968 when he matched it with a radio object, VRO 42.22.01.
Within a year others observed that the radio flux varied, and that light was polarized. Strittmatter proposed the class of object in 1972 and added four objects. By 1976 there were 30 known objects.
Read more about this topic: BL Lac Objects
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