PKS 0521-365
Encyclopedia
PKS 2155-304 is one of the brightest active galaxies
in the sky. The source (BL Lac object) is a strong emitter from radio to gamma frequencies. The object is at z = 0.116.
Galaxy
A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter. The word galaxy is derived from the Greek galaxias , literally "milky", a...
in the sky. The source (BL Lac object) is a strong emitter from radio to gamma frequencies. The object is at z = 0.116.