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Questions and Answers
What is the main characteristic of a spiral galaxy?
What is the main characteristic of a spiral galaxy?
A spiral galaxy has a bulge, a disk, and a halo, with stars that are brightest near the center.
How do the stars in an elliptical galaxy differ from those in a spiral galaxy?
How do the stars in an elliptical galaxy differ from those in a spiral galaxy?
Stars in an elliptical galaxy tend to be older than those in a spiral galaxy.
What defines an irregular galaxy?
What defines an irregular galaxy?
An irregular galaxy does not have a clearly defined shape and symmetry, often appearing deformed.
Describe the role of gravity in the formation of galaxies.
Describe the role of gravity in the formation of galaxies.
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What factors contribute to the classification of irregular galaxies?
What factors contribute to the classification of irregular galaxies?
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Study Notes
Galaxy Types
- A galaxy is a collection of stars, gas, dust, and remnants of stars, bound together by gravity.
Spiral Galaxy
- A spiral galaxy has a bulge, disk, and halo.
- Stars are brightest near the center and less bright near the edges.
- Spiral galaxy stars tend to be younger than those in elliptical galaxies.
- Spiral galaxies vary greatly in size.
Elliptical Galaxy
- Shaped like an elongated sphere.
- A bright mass of stars.
- Stars are brightest near the center and less bright near the edges.
- Stars in elliptical galaxies are generally older than those in spiral galaxies.
- Elliptical galaxies vary greatly in size.
Irregular Galaxy
- Does not have a clearly defined shape or symmetry.
- Often smaller than spiral or elliptical galaxies.
- Scientists classify them based on how much structure they have.
- Their shape might be due to uneven gravitational forces or collisions with other galaxies.
Galaxy Formation
- Gravity attracts matter.
- Strong gravity causes stars to form in clumps.
- Numerous small star clusters merge to form galaxies.
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Description
Explore the fascinating world of galaxies in this quiz, covering the three main types: spiral, elliptical, and irregular galaxies. Learn about their structures, star ages, and formation processes. Test your understanding of how gravity and other factors influence the evolution of these celestial collections.
