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Questions and Answers
Which characteristics can be used to differentiate star systems? (Select three options)
Which characteristics can be used to differentiate star systems? (Select three options)
- The age of the stars in the system (correct)
- The way stars are organized in the system (correct)
- The number of stars in the system (correct)
- The color of the stars
A/An ______ star system is made of two stars.
A/An ______ star system is made of two stars.
binary
A/An ______ star system is made of no more than a few thousand stars.
A/An ______ star system is made of no more than a few thousand stars.
open cluster
A/An ______ star system is made of more than a million stars.
A/An ______ star system is made of more than a million stars.
Which type of star system is pictured?
Which type of star system is pictured?
Based on the information provided, which title would be most appropriate?
Based on the information provided, which title would be most appropriate?
Which characteristic is used to classify galaxies?
Which characteristic is used to classify galaxies?
How are NGC 1427A and U different?
How are NGC 1427A and U different?
What type of galaxy is shown in the image?
What type of galaxy is shown in the image?
Which type of galaxy is shown in the image?
Which type of galaxy is shown in the image?
What phrase best defines a galaxy?
What phrase best defines a galaxy?
Which phenomenon describes the dimmer star passing in front of the brighter star?
Which phenomenon describes the dimmer star passing in front of the brighter star?
Which phrases accurately describe an elliptical galaxy? (Check all that apply)
Which phrases accurately describe an elliptical galaxy? (Check all that apply)
What type of galaxy is shown in the image?
What type of galaxy is shown in the image?
What best describes the second type of spiral galaxy?
What best describes the second type of spiral galaxy?
Which type of star cluster is shown in the image?
Which type of star cluster is shown in the image?
Which sentences describe star clusters? (Check all that apply)
Which sentences describe star clusters? (Check all that apply)
Which statements accurately describe binary star systems? (Check all that apply)
Which statements accurately describe binary star systems? (Check all that apply)
What are the main types of star clusters? (Check all that apply)
What are the main types of star clusters? (Check all that apply)
Which type of star system has the most stars?
Which type of star system has the most stars?
Which phrases accurately describe a light-year? (Check all that apply)
Which phrases accurately describe a light-year? (Check all that apply)
Which type of galaxy has arms that contain sites of active star formation and start close to a bulge in the center?
Which type of galaxy has arms that contain sites of active star formation and start close to a bulge in the center?
What type of star cluster is shown in the image?
What type of star cluster is shown in the image?
Which words identify types of galaxies? (Check all that apply)
Which words identify types of galaxies? (Check all that apply)
Which term defines a star system with two stars?
Which term defines a star system with two stars?
Which are types of star systems? (Check all that apply)
Which are types of star systems? (Check all that apply)
Which quantity does a light-year measure?
Which quantity does a light-year measure?
What is the Milky Way?
What is the Milky Way?
Which phrases describe an irregular galaxy? (Check all that apply)
Which phrases describe an irregular galaxy? (Check all that apply)
Which characteristics describe a spiral galaxy? (Check all that apply)
Which characteristics describe a spiral galaxy? (Check all that apply)
Which feature is used to classify galaxies?
Which feature is used to classify galaxies?
Which type of star cluster forms from tightly packed groups of older stars?
Which type of star cluster forms from tightly packed groups of older stars?
Which type of star cluster is loose and disorganized?
Which type of star cluster is loose and disorganized?
What phrase best defines a star system?
What phrase best defines a star system?
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Study Notes
Star Systems
- Characteristics for differentiating star systems include the number of stars, their ages, and their organization.
- A binary star system consists of two stars.
- Open clusters contain a few hundred to a few thousand stars, while globular clusters have more than a million stars.
- Eclipsing binaries occur when a dim star passes in front of a brighter star.
- Binary star systems may exhibit wobbling due to gravitational interactions and often involve one brighter star.
Star Clusters
- Star clusters are groups of stars that form from the same nebula and are located at similar distances from Earth.
- Main types of star clusters are globular and open. Globular clusters feature tightly packed older stars, while open clusters are more loose and disorganized.
Galaxies
- Galaxies are vast collections of stars, gas, and dust held together by gravity.
- Common classifications of galaxies include elliptical, spiral, and irregular.
- Characteristics of spiral galaxies include a pinwheel shape, plentiful gas and dust, and active star formation within their arms.
- Elliptical galaxies lack new star formation and have little gas or dust between stars.
- Irregular galaxies contain many young stars and are smaller than other galaxy types.
Types of Spiral Galaxies
- Two types of spiral galaxies: normal spiral galaxies and barred spiral galaxies, the latter having a bar structure through the center.
Milky Way
- The Milky Way is a spiral galaxy that is home to Earth.
Light-Year
- A light-year measures distance, specifically how far light travels in a year, equivalent to approximately 9.46 trillion kilometers (5.88 trillion miles).
Characteristics of Specific Galaxies
- Irregular galaxies are marked by abundant young stars, gas, and dust.
- Barred spiral galaxies have arms extending from a central bar, distinguishing them from regular spiral galaxies.
Classification Criteria
- Galaxies can be classified based on their shapes: elliptical, spiral, and irregular.
- Light-years are a crucial unit for measuring cosmic distances.
Active Star Formation
- Sites of active star formation predominantly occur in the arms of spiral galaxies.
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