Star Life Cycle
Star Life Cycle 2
Star Characteristics
Hertzsprung-Russell diagram
HR diagrams
100
Which type of star ends its life cycle in the form of a neutron star or a black hole?
High-Mass Star
100
All stars start out as...
Protostars
100
An astronomer uses a telescope to observe a star. She observes that the color of this star is similar to the color of the sun. Using this information, what can the astronomer guess about the star?
A.The star is hotter than most other stars in our galaxy.
B. The star and the sun have similar size and surface temperatures.
C.The star is becoming a black hole because its core has collapsed.
D.The star is a white dwarf because nuclear fusion in the star has stopped.
B. The star and the sun have similar size and surface temperatures.
100
- What features of stars are plotted on the Hertzsprung-Russell diagram?
Luminosity and Temperature
100
Put the colors of stars in order from HOTTEST to COOLEST.
Blue, White, Yellow, Orange, Red
200
What determines the life path a star will take?
Mass
200
Where are stars "born"?
Star forming nebulas
200
- What characteristic of stars can be measured using luminosity?
Brightness
200
Which of the following statements does not accurately describe the Hertzsprung-Russell diagram?
- A. Bright stars are located at the top of the diagram.
- B. Dim stars are located at the bottom of the diagram.
- C. Hot stars are located on the left side of the diagram.
- D. Cool stars are located on the left side of the diagram.
- D. Cool stars are located on the left side of the diagram.
200
Where are red giants and red supergiants located on an HR diagram?
The top right
300
Which stage in the life cycle of a high-mass star is characterized by the star collapsing and throwing its outer layers into space?
Super Nova
300
What type of stars go supernova?
High mass stars (only red SUPERgiants)
300
What does luminosity refer to?
Brightness
300
What band on the HR-Diagram represents the area where most stars live their life?
A. the upper-left quadrant
B. the lower-left quadrant
C. the upper-right quadrant
D. the diagonal band that runs from the upper-left to the lower-right
D. the diagonal band that runs from the upper-left to the lower-right
300
What type of stars are located in the bottom left corner of the HR diagram?
White dwarfs
400
At the end of its life cycle, a high-mass star sometimes leaves behind an invisible object in which gravity is so strong that radiation cannot escape. What do we call this object?
Black Hole
400
What will our sun eventually turn into?
Red giant in about 5.5 billion years
400
Fill in the blanks:
A white dwarf is but than the sun.
Hotter, Dimmer
Hotter, Smaller
400
Describe a star located at the top left corner of an HR diagram.
Bright and hot
400
Zeta Eridani
500
What kind of star becomes a giant when fusion slows down, the outer atmosphere of the star expands, luminosity increases, and the star begins to fuse helium into carbon?
Low-Mass Star, Main Sequence Average Star
500
What process occurs throughout most of a star’s lifetime?
Nuclear Fusion
500
How is it possible for a star that is actually dimmer than another star to appear brighter to an observer on Earth?
Because it is closer to Earth so the apparent magnitude is greater. Distance
500
What percent of stars are in the main sequence stage of life and why?
90% because stars spend most of their lives in this stage.
500
Barnard's Star