CL- Stars and Galaxies Final Exam '25

1.What is the difference between a light-year and Astronomical Unit?

• A. Astronomical Units are only used for distances within the solar system, light-years for distances outside the solar system.
• B. Astronomical Units measure the distance between Earth and an object, light-years the distance between two different objects.

2.What happens to the hydrogen in the core of a star as shown in the figure?

• A. Over time it will fuse into more complex nuclei.
• B. It is slowly consumed.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

3.What are the main components of stars?

• A. helium and hydrogen
• B. helium and oxygen

Tags

NGSS.HS-ESS1-1

4.What is the expected fate of the Milky Way?

• A. It will be swallowed by the black hole in its center.
• B. It will merge with the Andromeda galaxy.

5.What is the phrase given to the combination of several atomic nuclei into one large nucleus?

• A. cold fission
• B. nuclear fusion

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

6. From the figure which layer is the outermost layer of a star?

• A. photosphere
• B. corona

7. What can be said about high-mass stars?

• A. They process hydrogen at a very low rate.
• B. They remain main-sequence stars for a relatively short time.

8.What are the hottest and densest regions in a nebula called?

• A. protostars
• B. diffuse stars

9.Luminosity and size are used to create the diagram shown in the figure. What is that figure called?

• A. Lister-Rimmer diagram
• B. apparent magnitude scale
• C. Hipparchus diagram
• D. Hertzsprung-Russell diagram

Tags

NGSS.HS-ESS1-3

10.What are the characteristics of an irregular galaxy?

• A. It has little or no dust and gas.
• B. It contains areas of intense star formation and many young stars