The Spiral Structure of the Milky Way Galaxy from Radio Observations
  The study of the Milky Way structure is vital importance for a better
understanding of the universe. This study digs deeper into the structure of
Milky Way Galaxys with emphasis to its spiral arms. Multiple data sources were
sought including the NASA websites. As found out, the Milky Way is a disk
shaped galaxy composed of four spiral arms, two large and the rest are smaller.
The spiral arms are regions of actively forming new stars dominated by young
stars, dust and gas. Dust and gas are primary materials for the formation of
new stars. This dust is also responsible for the reddish appearance of the
stars since it absorbs more blue light than red. Besides the disk, there are
numerous older stars, which appear white in color according to the picture by
COBE. Additionally, the Milky Way contains a dark halo, extensive but void of
luminous stars. The extensive halo was discovered due to the gravitational pull
it exerts on existing visible matter.
