Gamma Ray Quasars

Like other quasars, gamma-ray quasars look like normal stars in photographic images. Although these two quasars (Quasar 3C273 and Quasar 3C279) appear similar in visible light, the Compton Observatory gamma-ray image of them reveals a remarkable difference.

(Visible light images courtesy of STScI, ROE, AAO, and NASA)

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