Podcast
Questions and Answers
What is a black hole?
What is a black hole?
- A type of galaxy
- An area devoid of any matter
- A region of space with matter so dense that light cannot escape it (correct)
- A star that has exploded
What describes an elliptical galaxy?
What describes an elliptical galaxy?
- A galaxy with a central bulge and arms
- A galaxy formed by the collision of other galaxies
- A galaxy whose stars are symmetrically dispersed in a spherical or elongated shape (correct)
- A region of space with no stars
What is a galaxy?
What is a galaxy?
A large-scale collection of stars, dust, and gas held together by gravity
What defines an irregular galaxy?
What defines an irregular galaxy?
What is the shape of a spiral galaxy?
What is the shape of a spiral galaxy?
What does a galaxy include? (Choose all that apply)
What does a galaxy include? (Choose all that apply)
A galaxy whose stars are symmetrically dispersed in a spherical or flattened shape is _____ galaxy.
A galaxy whose stars are symmetrically dispersed in a spherical or flattened shape is _____ galaxy.
The Milky Way is _____ galaxy.
The Milky Way is _____ galaxy.
A galaxy whose stars are arranged in a disk with arms that surround a central bulge is _____ galaxy.
A galaxy whose stars are arranged in a disk with arms that surround a central bulge is _____ galaxy.
What are the basic shapes into which astronomers classify most galaxies?
What are the basic shapes into which astronomers classify most galaxies?
The most common shape for a galaxy is ______.
The most common shape for a galaxy is ______.
The Milky Way is located in the _____ Group.
The Milky Way is located in the _____ Group.
A galaxy cluster contains between _____ galaxies.
A galaxy cluster contains between _____ galaxies.
The Milky Way is apparently on a course to collide with Andromeda at some point in the distant future.
The Milky Way is apparently on a course to collide with Andromeda at some point in the distant future.
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Study Notes
Black Holes
- Defined as regions in space with such dense matter that light cannot escape.
Types of Galaxies
- Elliptical Galaxy: Stars are symmetrically arranged in spherical or elongated shapes.
- Irregular Galaxy: Formed by the collision of other galaxies, lacking a defined shape.
- Spiral Galaxy: Characterized by a central bulge, a flattened disk, and curving arms.
General Concepts
- A galaxy is a vast assembly of stars, dust, and gas maintained together by gravitational forces.
- Key components of a galaxy include planets, stars, dust, interstellar gas, and dark matter.
Milky Way and Galaxy Classification
- The Milky Way is classified as a barred spiral galaxy.
- Astronomers categorize most galaxies into three basic shapes: irregular, elliptical, and spiral.
- The most prevalent galaxy shape identified is spiral.
- The Milky Way resides in the Local Group of galaxies.
Galaxy Clusters
- A galaxy cluster typically contains between 50 to 1,000 individual galaxies.
Future Collision
- The Milky Way is on a projected collision course with the Andromeda galaxy in the distant future.
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