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What is a BL Lacertae object?

Double stars

Star-like objects

Variable stars

magnetic bodies

BL Lac objects are defined as possessing the following characteristics: star-like, surrounded by nebulosity; large and sometimes rapid light variations; up to 35% polarization with rapid changes in angle and degree; and optical spectral features generally weak or undetected.

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2462

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201

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116

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210

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