Which of these are properties of elliptical galaxies? Select all tha...
Which of these are properties of elliptical galaxies? Select all that apply. A. have several arms B. rotate relatively quickly C. can have various shapes D. appear similar from each side
Properties of Elliptical Galaxies
Elliptical galaxies are one of the main types of galaxies, alongside spiral and irregular galaxies. They are characterized by their smooth, ellipsoidal shape and lack of prominent features like spiral arms or a distinct disk. Choosing the correct properties from the options provided requires understanding these key characteristics.
Understanding Elliptical Galaxy Properties
Let's break down each option and see how it relates to elliptical galaxies:
A. Have several arms
This is incorrect. Spiral galaxies are known for their spiral arms, where star formation actively occurs. Elliptical galaxies, in contrast, lack these structures.
B. Rotate relatively quickly
This is generally incorrect. While elliptical galaxies do rotate, their rotation is typically much slower and less organized than the rotation of spiral galaxies. The stars within an elliptical galaxy move in more random orbits, like a swarm of bees, rather than a cohesive, rotating disk.
C. Can have various shapes
This is correct. Elliptical galaxies can range from nearly spherical (E0) to highly elongated (E7) in shape. The numerical classification reflects their ellipticity, or how stretched out they appear.
D. Appear similar from each side
This is correct. Due to their ellipsoidal shape and lack of defining features like spiral arms, elliptical galaxies appear relatively similar regardless of the viewing angle. Their symmetry is a defining characteristic.
Elliptical Galaxies in Context
Elliptical galaxies are often found in dense galaxy clusters and are thought to form through the mergers of smaller galaxies. This merging process disrupts the ordered structure of spiral galaxies and randomizes the stellar orbits, leading to the smooth, elliptical shape. They also tend to contain older stars and less gas and dust compared to spiral galaxies, resulting in lower rates of new star formation.
Summary of Correct Answers
The correct properties of elliptical galaxies from the options given are:
- C. Can have various shapes
- D. Appear similar from each side
FAQ: Common Questions about Elliptical Galaxies
Q: Are elliptical galaxies bigger than spiral galaxies?
A: Elliptical galaxies can vary greatly in size, from dwarf ellipticals smaller than some globular clusters to giant ellipticals that are among the largest known galaxies. Some giant ellipticals are significantly larger than the Milky Way, a spiral galaxy.
Q: Why are elliptical galaxies redder than spiral galaxies?
A: The reddish color of elliptical galaxies is due to their older stellar populations. Massive, blue stars have shorter lifespans and have already died out in elliptical galaxies, leaving behind the longer-lived, redder stars.
Q: Do elliptical galaxies have black holes?
A: Yes, supermassive black holes are thought to reside at the centers of most, if not all, massive galaxies, including ellipticals.
Call to Action
Learn more about galaxies by visiting your local planetarium or exploring online resources like NASA's website. The universe is full of fascinating objects waiting to be discovered!
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