Wednesday, 2 January 2013

THE MILKY WAY GALAXY: VIEW



View:

 
The Milky Way galaxy, as viewed from the Earth (itself situated on one of the spiral arms of the galaxy) , appears as a hazy band of white light in the night sky arching across the entire celestial sphere originating from stars and other material which lie within the galactic plane. The plane of the Milky Way is inclined by about 60° to the ecliptic, with the North Galactic Pole situated at right ascension 12h 49m, declination +27.4° near beta Comae Berenices. The South Galactic Pole is near alpha Sculptoris. The Milky Way looks brightest in the direction of the constellation of Sagittarius, toward the galactic center. Relative to the celestial equator, it passes as far north as the constellation of Cassiopeia and as far south as the constellation of Crux, indicating the high inclination of Earth's equatorial plane and the plane of the ecliptic relative to the galactic plane. The fact that the Milky Way divides the night sky into two roughly equal hemispheres indicates that our Solar System lies close to the galactic plane. The Milky Way has a relatively low surface brightness, making it difficult to see from any urban or suburban location suffering from light pollution.

THE MILKY WAY GALAXY: OVERVIEW



Overview:

 The Milky Way is a barred spiral galaxy that is part of the Local Group of galaxies. Although the Milky Way is one of billions of galaxies in the observable universe, the Galaxy has special significance to humanity as it is the home galaxy of the Solar System. The plane of the Milky Way galaxy is visible from Earth as a band of light in the night sky, and it is the appearance of this band of light which has inspired the name for our galaxy. Some sources hold that, strictly speaking, the term Milky Way should refer exclusively to the observation of the band of light, while the full name Milky Way Galaxy, or alternatively the Galaxy should be used to describe our galaxy as an astrophysical whole. It is unclear how widespread the usage of this convention is, however, and the term Milky Way is routinely used in either context.