Elliptical Galaxies
An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile. These galaxies are one of the three main types of galaxies, the other two being spiral and irregular galaxies.
Characteristics of Elliptical Galaxies
- Elliptical galaxies are typically red in color, indicating an older stellar population.
- They lack the distinctive spiral arms found in spiral galaxies.
- Elliptical galaxies are often found in galaxy clusters and are among the most massive galaxies in the universe.
- They contain mostly older stars and have little interstellar gas and dust, which means they have low rates of star formation.
- The shape of elliptical galaxies ranges from nearly spherical (E0) to highly elongated (E7).
Formation and Evolution
Elliptical galaxies are thought to form through the mergers of smaller galaxies, leading to the redistribution of stars and the disruption of any spiral structure. This process results in a more spheroidal, featureless appearance.
Study Guide
Key Concepts
- Define an elliptical galaxy and describe its general appearance.
- Compare and contrast elliptical galaxies with other types of galaxies.
- Explain why elliptical galaxies are often found in galaxy clusters and their relationship to the cosmic web.
- Discuss the role of galaxy mergers in the formation of elliptical galaxies.
Review Questions
- What are the main characteristics of elliptical galaxies?
- How do elliptical galaxies differ from spiral galaxies?
- Explain the relationship between elliptical galaxies and galaxy clusters.
- What is the role of galaxy mergers in the formation of elliptical galaxies?
Activities
- Research and create a visual presentation comparing the different types of galaxies, including elliptical, spiral, and irregular galaxies.
- Visit a planetarium or observatory to observe and identify different types of galaxies in the night sky.
- Simulate the process of galaxy mergers using computer software or physical models.
◂Science Worksheets and Study Guides First Grade. Describe and measure matter
Study Guide
Describe and measure matter 
Worksheet/Answer key
Describe and measure matter Worksheet/Answer key
Describe and measure matter Worksheet/Answer key
Describe and measure matter Vocabulary/Answer key
Describe and measure matter Vocabulary/Answer key
Describe and measure matter
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Concepts of Physical Science (SB1, SB2, SB3, SB4)
The student demonstrates an understanding of the structure and properties of matter by classifying matter according to physical properties (i.e., color, size, shape, weight, texture, flexibility).