GALAXY
A GALAXY IS A HUGE MASS OF STARS, nebulae, and interstellar material. The smallest galaxies contain about 100,000 stars, while the largest contain up to 3 trillion stars. There are three main types of the galaxy, classified according to their shape: elliptical, which are oval-shaped; spiral, which has arms spiraling outward from a central bulge (those whose arms spiral from a bar-shaped bulge is called spirals); and irregular, which have no obvious shape.
Sometimes, the shape of a galaxy is distorted by a collision with another galaxy. Quasars (quasistellar objects) are thought to be galactic nuclei but are so far away that their exact nature is still uncertain.
They are compact, highly luminous objects in the outer reaches of the known universe: while the farthest known “ordinary” galaxies are about 12 billion light-years away, the farthest known quasar is about 13 billion lightyears away. Active galaxies, such as Seyfert galaxies and radio galaxies, emit intense radiation. In a Seyfert galaxy, this radiation comes from the galactic nucleus; in a radio galaxy, it also comes from huge lobes on either side of the galaxy. The radiation from active galaxies and quasars is thought to be caused by material falling into central black holes.
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