Nebulae

The nebulae is more or less solid, evident or not from Earth. Nebulae can be found anywhere in the interstellar space. Before the invention of the telescope, the term nebula was applied to all celestial objects of diffuse appearance. As a result, many objects are now known to be star clusters of galaxies were called nebulae. Nebulae have been detected in almost all galaxies, including our own, the Milky Way. Depending on the age of stars associated, it can be classified into two groups: 1. - Associated evolved stars, such as planetary nebulae and supernova remnants. 2. - Associated with very young stars, some even still in the process of training, such as Herbig-Haro objects and molecular clouds.

Star clusters

Star cluster is a group of stars detained jointly since regards the result of gravitation. Star clusters are classified into two groups: open clusters, which have no definite shape, and globular clusters, which are spherical or nearly spherical. The open consist of a few hundred young stars, while globular clusters contain more than a thousand times that amount, and are generally very old stars. Globular clusters form a halo around our galaxy, the Milky Way, while the open is located in the spiral arms. Open clusters are much more numerous than globular: about 1,000 are known in our galaxy and there are only 140 globular.

What is the Milky Way?

Specification we could well see the Milky Way from external fettle, we would see the center bulky, bright yellow, shaped like a rugby ball, and a thin disk of blue revolving approximately. The Milky Way is a barred spiral, like a pinwheel. It is believed that the center is a black hole, which scientists call Sagittarius A. The center is not rounding, but rather elongated. Near him are the oldest stars, red and yellow.

 Instinctive hub four arms: Arm Peruses, Orion Arm, Arm Cross Arm Sagittarius and Centaurs. Form a slowly rotating disk in a spiral. In the arms are the youngest stars, White and Blue. There are also many nebulae where new stars form. The Sagittarius Arm is the brightest of all.