Galaxy
A galaxy is a large collection of stars, glowing nebulae (clouds), gas, and dust bound together by gravity. Many scientists now believe that a black hole, the remains of a massive star, lies at the center of many galaxies. Galaxies are as plentiful in the universe as grains of sand on a beach. The galaxy that contains our solar system is called the Milky Way. The Milky Way is part of a cluster of some 30 galaxies known as the Local Group, and the Local Group is part of a local supercluster that includes many clusters.
Although astronomers are not yet sure how galaxies formed and evolved, the process must have occurred quickly...
[The entire page is 1499 words long]
Join eNotes
Over 3,500 study guides, question and answer forums, literature criticism, reference content, and much more!
