Understanding Stars and the Universe

What process in stars converts mass back into energy?

• Photosynthesis

• Evaporation

• Nuclear fusion

• Chemical reaction

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How can the composition of a star be determined?

• By its temperature

• By its size

• By the color of light it radiates

• By its distance from Earth

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What does the color of a star indicate?

• Its distance from Earth

• Its age

• Its composition

• Its gravitational pull

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What is the role of gravitation in stars?

• It changes the star's color

• It facilitates the conversion of mass into energy

• It cools down the star

• It increases the star's size

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What is the relationship between mass and energy in the universe?

• Mass can never be converted into energy

• Energy is a form of mass

• All mass was once energy

• Mass and energy are unrelated

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Nora and Isla are observing the night sky and wondering, what happens to the energy released in nuclear fusion in stars?

• It is lost in space

• It increases the thermal energy of the star's atoms

• It is absorbed by the star

• It decreases the star's temperature

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NGSS.HS-ESS1-1

What is the primary factor that determines the lifecycle of a star?

• Its gravitational pull

• Its initial mass

• Its color

• Its distance from Earth

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How does the redshift of light from distant galaxies support the Big Bang theory?

• It proves galaxies are shrinking

• It suggests galaxies are moving away

• It indicates galaxies are stationary

• It shows galaxies are moving closer

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What is the main source of energy for stars during the majority of their lifetime?

• Radioactive decay

• Nuclear fusion of hydrogen into helium

• Gravitational contraction

• Magnetic fields

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Which process is responsible for the energy produced by the Sun?

• Gravitational collapse

• Nuclear fission

• Nuclear fusion

• Chemical reactions

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