Podcast
Questions and Answers
A collection of stars, interstellar gas, dust and remnants of stars that are all bound together by ______.
A collection of stars, interstellar gas, dust and remnants of stars that are all bound together by ______.
gravity
A galaxy shaped like an elongated sphere is called an ______ galaxy.
A galaxy shaped like an elongated sphere is called an ______ galaxy.
elliptical
Spiral galaxies contain a bulge, a disk and a ______.
Spiral galaxies contain a bulge, a disk and a ______.
halo
Irregular galaxies usually do not have a clearly defined shape and are often much ______ than spiral or elliptical galaxies.
Irregular galaxies usually do not have a clearly defined shape and are often much ______ than spiral or elliptical galaxies.
The formation of galaxies occurs as matter is attracted to other nearby matter due to ______.
The formation of galaxies occurs as matter is attracted to other nearby matter due to ______.
Flashcards
Spiral Galaxy
Spiral Galaxy
A galaxy with a bulge, disk, and halo, where stars are brightest near the center.
Elliptical Galaxy
Elliptical Galaxy
A galaxy shaped like an elongated sphere, with older stars.
Irregular Galaxy
Irregular Galaxy
A galaxy with no specific shape, often smaller and with deformed structures.
Galaxy components
Galaxy components
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Galaxy Formation
Galaxy Formation
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Study Notes
Galaxy Definition
- A galaxy is a collection of stars, interstellar gas, dust, and remnants of stars bound together by gravity.
Types of Galaxies
- Spiral Galaxy: A galaxy containing a bulge, a disk, and a halo. The stars are brightest near the center, and less so near the edges. Stars in spiral galaxies are typically younger.
- Elliptical Galaxy: Elongated sphere shaped galaxy, featuring a bright mass of stars, becoming less bright towards the outer edges. Generally contains older stars. Comes in a variety of sizes.
- Irregular Galaxy: Lacking a clearly defined shape; their structure is deformed due to uneven gravitational forces. Usually smaller than other types of galaxies. Shape changes could arise from collisions with other galaxies.
Galaxy Formation
- Gravity pulled nearby matter together, creating larger clumps.
- Gravity intensified, forming stars inside these clumps.
- Small star clusters filled the universe.
- These clusters interacted, merged, to form galaxies.
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