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Chapter 14
Our Galaxy
9
Physics
Undergraduate 1
04/21/2008
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Term
Spiral Density Wave
 Definition
the theory that the massive black hole in our galaxy sens compression wave thru the galaxy and creates new spiral arms
Term
Interstellar Medium
 Definition
material between stars gas and dust
Term
21 cm radiation
 Definition
hydrogen spin flip radio waves
Term
Dark Matter
 Definition
90% of matter in galaxy
Term
Cosmic rays
 Definition
particles shot out by supernova
Term
Dust grains
 Definition
carbon and silicate dust between stars
Term
Emission nebula
 Definition
heated glowing gasses
Term
Reflection nebula
 Definition
bluish from dust reflection
Term
Molecular Clouds
 Definition
prime ares for formation
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