Galaxies and the Universe Lesson 4

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6 Terms

1
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Galaxies

Huge collections of stars.

2
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Dark matter

Matter that emits no light at any wavelength.

3
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Doppler Shift

The shift to a different wavelength.

4
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Spiral Galaxy

A galaxy shaped like a pinwheel; a large flat disc with arms radiating out.

5
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Elliptical Galaxy

A galaxy shaped like a sphere, egg, or football.

6
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Irregular Galaxy

A galaxy with no definite shape.