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- 1. Multiple Choice
Which of the following best describes a nebula?
a cloud of adult stars that floats through space where protostars are born
a fixed system of stars where supernovas form neutron stars
a cloud of dust and gas that floats through space where protostars are born
an infinitely dense cloud of dust that floats through space and contains black holes
- 2. Multiple Choice
What triggers the birth of a star?
A disturbance in a nebula causes its center to begin collapsing from gravity.
Dust becomes denser in a nebula, forming a star’s core.
A nebula floats within the field of another star and brings in additional hydrogen.
A red dwarf collides with a larger star, causing the star to break apart.
- 3. Multiple Choice
True or False: It could take 50 million years for a protostar to become an adult star.
true
false
- 4. Multiple Choice
Hydrogen atoms bond to create a new star in a process called
supernova fusion.
nuclear fusion.
hydrogen collapse.
protostar.
- 5. Multiple Choice
Which of the following best describes the relationship between red dwarfs and giant stars?
Red dwarfs are less common than giants and live longer.
Red dwarfs burn energy faster than giants and have shorter lives.
Red dwarfs burn energy slower than giants and live longer.
Red dwarfs are more common than giants and have shorter lives.
- 6. Multiple Choice
The sun is ________ star.
a white dwarf
the hottest known
the largest living
an average-sized
- 7. Multiple Choice
Which of the following best describes the death of a red dwarf?
Hydrogen burns up in the star’s core, while the star remains at the same temperature. The layers of the star condense, and the star becomes a white dwarf.
Hydrogen expands in the star’s core, and the star begins to grow. As layers of the star expand, the star becomes a supergiant.
Hydrogen burns up in the star’s core, and the core begins to cool. The layers of the star loosen up, and the star becomes a white dwarf.
Hydrogen burns up in the star’s core, and the core begins to freeze. The layers of the star expand, and a chemical reaction causes a supernova.
- 8. Multiple Choice
True or False: A supernova occurs every time a star dies.
true
false
- 9. Multiple Choice
Which of the following is true of black holes?
They have a strong gravitational pull.
They are less dense than the sun.
They are created by a nebula.
They are a type of galaxy.
- 10. Multiple Choice
Neutron stars are the result of
collapsing nebulas.
red dwarf expansion.
protons and electrons combining.
neutrons emitting from a white dwarf.
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