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Level 203

Doppler Effect, Types of Galaxies


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Doppler effect
is an observed change in the frequency of a wave when the source or observer is moving
Blue Shift
If a galaxy is moving toward Earth, the light we receive will seem compressed to shorter wavelengths. This change is called a _______.
Red Shift
If a galaxy is moving away from Earth, the light we receive will seem stretched to longer wavelengths. This change is called a _______.
Types of Galaxies
Spiral, Elliptical,and Irregular.
Spiral Galaxy
a galaxy having a spiral structure and arms that spiral out contain young bright stars
Elliptical Galaxy
a galaxy shaped like a round or flattened ball, generally containing only old stars.
Irregular Galaxy
has an undefined shape and contains lots of young stars, dust, and gas.
Super-massive Black Hole
largest type in a galaxy; most if not all galaxies are thought to contain one at its center
Quasar
An unusually bright object found in the remote areas of the universe. Quasars release incredible amounts of energy and are among the oldest and farthest objects in the known universe. They may be the nuclei of ancient, active galaxies.