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Hubble Sees Active Spiral Galaxy: NGC 7172

In this image, the NASA/ESA Hubble Space Telescope has captured the brilliance of the spiral galaxy NGC 7172. This Hubble image shows NGC 7172, an active spiral galaxy some 110.5 million light-years away in the constellation of Piscis…

Astronomy & Astrophysics 101: Active Galactic Nucleus

This image from the NASA/ESA Hubble Space Telescope shows the galaxy Markarian 509. The bright object at the center of the galaxy, which appears like a star, is an active galactic nucleus. This is a bright celestial phenomenon caused by…