can you explain the structure of the galaxy mentioned above?
Bar-shaped core region surrounded by a warped disk of gas, dust and stars.
Milky Way
The Milky Way consists of a bar-shaped core region surrounded by a warped disk of gas, dust and stars. 
what is canis major? A constellation what are its characteristics? The equatorial coordinate system lie between and , while the declination coordinates are between −11.03° and −33.25°. could you tell me something about its stars? Sirius is the brightest star in the night sky. what can you tell me about the astronomy in the southern hemisphere? Southern Hemisphere is that half of the celestial sphere that is south of the celestial equator. can you tell me something about the group of stars? An area on the celestial sphere in which a group of visible stars forms a perceived outline. where did it get its name from? Late Latin term when was it first discovered? Prehistory how are these identified? Identified as essentially imagined figures with only a certain basis in the actually observable sky. can you explain dark cloud constellations? Some cultures have discerned shapes in the Great Rift, a series of dark patches in the Milky Way, and have given names to these "dark cloud constellations".
wiki:18352348
Milky Way [SEP] Structure
The Milky Way consists of a bar-shaped core region surrounded by a warped disk of gas, dust and stars. The mass distribution within the Milky Way closely resembles the type Sbc in the Hubble classification, which represents spiral galaxies with relatively loosely wound arms. Astronomers first began to conjecture that the Milky Way is a barred spiral galaxy, rather than an ordinary spiral galaxy, in the 1960s. These conjectures were confirmed by the Spitzer Space Telescope observations in 2005 that showed the Milky Way's central bar to be larger than previously thought.