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Questions and Answers
Which type of galaxy is characterized by a bulge, a disk, and a halo?
Which type of galaxy is characterized by a bulge, a disk, and a halo?
What characteristic is true of stars in an elliptical galaxy compared to those in a spiral galaxy?
What characteristic is true of stars in an elliptical galaxy compared to those in a spiral galaxy?
What is the primary reason that irregular galaxies lack a clear and defined shape?
What is the primary reason that irregular galaxies lack a clear and defined shape?
How are elliptical galaxies typically described in terms of their shape?
How are elliptical galaxies typically described in terms of their shape?
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What defines the classification of irregular galaxies?
What defines the classification of irregular galaxies?
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A ______ galaxy contains a bulge, a disk, and a halo.
A ______ galaxy contains a bulge, a disk, and a halo.
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The stars in an ______ galaxy tend to be older than those in a spiral galaxy.
The stars in an ______ galaxy tend to be older than those in a spiral galaxy.
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Irregular galaxies lack the clearly defined shape of ______ and elliptical galaxies.
Irregular galaxies lack the clearly defined shape of ______ and elliptical galaxies.
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Elliptical galaxies can vary greatly in ______.
Elliptical galaxies can vary greatly in ______.
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The formation of galaxies is primarily due to the force of ______.
The formation of galaxies is primarily due to the force of ______.
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Study Notes
Galaxy Definitions
- A galaxy is a collection of stars, interstellar gas, dust, and remnants of stars, all bound together by gravity.
Types of Galaxies
- Spiral Galaxy: A galaxy containing a bulge, a disk, and a halo. Stars are brightest near the center and less bright at the edges. Stars in spiral galaxies tend to be younger than those in elliptical galaxies.
- Elliptical Galaxy: Shaped like an elongated sphere, a bright mass of stars. Stars are brightest near the center and less bright toward the edges. Elliptical galaxies vary greatly in size; stars within are generally older than those in spiral galaxies.
- Irregular Galaxy: A galaxy that lacks the defined shape and symmetry of spiral or elliptical galaxies. They are usually smaller than the other two types. Their shape can be the result of uneven gravitational forces or collisions with other galaxies, causing them to deform.
Galaxy Formation
- Gravity pulls matter together from nearby matter.
- The force of gravity becomes intense, causing stars to form within these clumps.
- Small star clusters fill the universe.
- These clusters of stars attract and combine with other clusters, ultimately forming galaxies.
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Description
Explore the fascinating world of galaxies through this quiz. Learn about the characteristics of spiral, elliptical, and irregular galaxies, as well as the processes behind their formation. Test your knowledge and deepen your understanding of cosmic structures.
