## Stars and Galaxies in the Universe

 11.1 Stars and Galaxies in the Universe
 UNIVERSE
 $$\downarrow$$
 GALAXY

Galaxies

 Types of galaxies
 $$\swarrow$$ $$\downarrow$$ $$\searrow$$
 Spiral Elliptical Irregular * Andromeda  * The Milky Way * Ursa Major  * Messier 87 * Small Magellanic Cloud  * Large Magellanic Cloud

The Milky Way

• The Milky Way is a medium large spiral galaxy
• Our solar system is located at the edge of one of the spiral arms of the Milky Way
• It consists of approximately 200 billion stars and the Sun is one of it

 Stars

Characteristics to Classify Stars

• Colour
• Size
• Distance
• Brightness
• Temperature