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Maya_Fox
on FreezingBlue Flashcards.
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Milky Way
- Our galaxy
- Spiral galaxy
- We cannot properly study our galaxy because we are inside it
- By mapping galaxies with radio waves astronomers have determined the diameter to be 100 000 light-years
- Part of a local group containing forty other galaxies
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Galxay
- Collection of billions of stars, gas and dust held together by gravity
- Found throughout the universe
- Vary greatly in size and shape
- Three types: spiral, elliptical, irregular
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Spiral Galaxy
- Looks like a windmill or pinwheel
- Has a central bulge with arms spiraling out
- Classified by how tightly wound arms are
- Has gas and dust available for new stars
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Elliptical Galaxy
- No spiral structure
- Vary in shape from spherical to elongated
- Tend to be older galaxies with little to no new star formation in them
- Some of the oldest stars in the universe
- Largest galaxies in the universe
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Irregular Galaxies
- No regular shape like spiral or spherical
- Made of new and old stars
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Star Cluster
- Groups of stars held together by gravity and travel together
- Range from 10 stars to a million
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Open Cluster
- Collection of 50-1000 stars
- Appear along the main band of the milky way
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Globular Cluster
- Collection of 100 000 to a million stars arranged in a distinctive shape
- Appear in the center of the milky way
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Local Group
- Milky way is part of a local group with a diameter of 10 million light-years
- Andromeda and the milky way are the largest in our local group
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Supercluster
- Gigantic cluster of 4 to 25 cluster galaxies which is hundreds of millions of light-years in size
- astronomers theorize that there might be 125 billion galaxies
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