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Lab 10: The Milky Way

A galaxy is a collection of [stars], [gas], and [dust] gravitationally bound together.

Types of galaxies:

1. [Spiral] - dominated by a disk distribution
2. [Elliptical] - dominated by an halo distribution

The O plate was taken with a [blue]-color filter.
The E plate was taken with a [red]-color filter.

Types of Objects in the Sky:

• Emission:
  [HII Regions]
  
  [Emission Filaments]
  
  [Planetary Nebulae]



• Absorption:
  [Dust Clouds]
  
  [Globules]



• Reflection:
  [Reflection Nebulae]

O-plate

E-plate