Galaxies

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8 Terms

1
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What are the 3 main types of galaxies

Spiral

Irregular

Elliptical

2
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Describe a Spiral galaxy

Central bar, spiral arms extending outwards.

3
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Describe an Irregular galaxy

Galaxies with an irregular shape.

4
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Describe an Elliptical galaxy

An oval shaped galaxy with little gas and dust.

5
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Who first proposed that the universe was expanding

Georges Lemaitre

6
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What are Globular Star Clusters

Large dense and old with millions of old stars in a sphere shape.

7
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What are Open Star Clusters

Smaller, less dense, younger clusters with dozens to hundreds of young stars in an irregular shape.

8
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When did the universe begin expanding

13.8 billion years ago with the Big Bang