7.14 Stars and Galaxies Review

1. Stars shine because

• fusion takes place in their cores.
• their coronas reflect most visible light.
• they spend most of their time on the main sequence.

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

2. Which group represents the interior layers (inside, below the atmosphere) of a star?

• radiative zone, corona, photosphere
• core, radiative zone, convection zone
• chromosphere, convection zone, radiative zone

3. Which features of the Sun change over short periods of time?

• sunspots
• star clusters
• convection zone particles

4. The Hertzsprung-Russell diagram plots the

• layers and energy output of stars.
• fusion rate and age of bright stars.
• luminosity and temperature of stars.

5. Which star is the hottest?

• a white dwarf
• a red supergiant
• a blue main sequence star

6. Which sequence correctly shows how stars form?

• nebula forms -> nebula collapses -> protostar forms -> fusion begins
• protostar forms -> neubula forms -> fusion begins -> nebula collapses
• nebula forms -> protostar forms -> nebula collapses -> fusion begins

7. Which statement is true of stellar evolution?

• Black holes become neutron stars.
• Low-mass stars become supergiants.
• The most massive stars do not become white dwarfs.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

8. How do stars recycle matter?

• They stay on the main sequence.
• Black holes form and recycle gas for new stars.
• Gravity pulls together gases and matter from old stars to create new ones.

Tags

NGSS.HS-ESS1-3

9. Which process is NOT caused by gravity?

• Nebulae clump together to form protostars.
• A massive star's core collapses when fusion stops.
• The gas and dust around a protostar blow away after fusion begins.

Tags

NGSS.HS-PS2-1

10. Protostars become stars when

• cold, dense nebualae form.
• fusion begins in their cores.
• they produce thermal energy.