Glossary term: Spiral Galaxy
Spiral galaxies are galaxies that have spiral arms: regions of higher density that form as a galaxy rotates where gas and dust are compressed and new stars are born. Most spiral galaxies are disk galaxies, so the names are sometimes used interchangeably. Most spiral galaxies have a central bulge of stars, and many (including the Milky Way) have a central bar. Spiral galaxies are differentiated from elliptical, lenticular, irregular, and dwarf galaxies (though dwarf spiral galaxies also exist).Related Terms:
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Term and definition status: This term and its definition is still awaiting approval
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Spiral Galaxy MergerCaption: This image shows two interacting spiral galaxies located approximately 150 million light-years away. Two spiral galaxies are involved in this dance, creating visible distortions in their spiral arms due to the gravitational pull. What is starting as an embrace in this picture, will end in the merger of those two galaxies into one, most likely elliptical, galaxy.
Credit: ESO credit link
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