Hubble Classification of Galaxies (3)
All bright galaxies fall into one of 3 broad classes
according to their shape.
75% - Spiral
20 % - Elliptical
5 % - Irregular
Basic classification system developed by Edwin
Lots of young blue
in Irregulars, but
motions as well.
Our Milky Way
Our sun is just one of the perhaps 100 billion
stars that make up the Milky Way.
The sun is located about 28,000 light years from
the center of the Milky Way.
The Milky Way galaxy is ~100,000 – 130,000
light years in diameter.