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Galaxy BL Lacertae

BL Lacertae is the active center of a giant elliptic galaxy which originally was thought to be a star. This is also called a blazar, a subclass of quasars whose jet exactly points in our direction. So we can see right in the heart of the active galaxy. The extremely bright blazar very often shows short eruptions over the whole spectrum up to ultrahard gamma rays.

Constellation: Lacerta
Distance: 900 million light-years
Visual magnitude: 14.50
Type: E Seyfert

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    BL Lacertae
The washy dot in the center is BL Lacertae.
Photo: ESO Online Digitized Sky Survey

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