7.3 Stars have a life cycle

Fill in the Blanks

A star begins its life in a ___, where gravity pulls gas and dust together to form a ___ before nuclear ___ begins.

Open Ended

Why is it important to understand the life cycle of stars in the study of the universe?

Multiple Choice

What process causes stars to shine and release huge amounts of energy?

• Nuclear fusion

• Chemical reaction

• Radioactive decay

• Photosynthesis

Open Ended

Describe the process by which a star is formed from a nebula.

Multiple Select

Which of the following are true about the main sequence phase of a star's life?

• Most of a star's life is spent in this phase.

• Hydrogen atoms fuse to form helium.

• The Sun is currently in this phase.

• Stars become black holes during this phase.

Fill in the Blanks

Gravity pulls the star's matter inward, while fusion pushes matter

from the core.

Open Ended

What is hydrostatic equilibrium and why is it important for a star's stability?

Multiple Choice

Arrange the following stages of a star's life in the correct order: Protostar, Red Giant/Supergiant, Main Sequence, Nebula.

• Nebula, Protostar, Main Sequence, Red Giant/Supergiant

• Protostar, Nebula, Main Sequence, Red Giant/Supergiant

• Main Sequence, Nebula, Protostar, Red Giant/Supergiant

• Nebula, Main Sequence, Protostar, Red Giant/Supergiant

Multiple Choice

Which of the following is the final stage for a low-mass star like the Sun?

• White Dwarf

• Neutron Star

• Black Hole

• Red Giant

Open Ended

What is the key difference in the fate of low-mass and high-mass stars after the main sequence stage?

Multiple Select

After a supernova, what are the possible outcomes for a high-mass star?

• Neutron star

• Black hole

• White dwarf

• Red giant

Multiple Choice

What is the main factor that determines whether a star will end its life as a white dwarf, neutron star, or black hole?

• Its mass

• Its temperature

• Its distance from Earth

• Its color

Open Ended

Describe how the timeline of the universe led to the formation of our Sun, referencing key events and their approximate ages.

Multiple Choice

Which of the following best explains why gravity and fusion are important in the life of a star?

• They keep the star in balance and determine its evolution.

• They cause the star to explode immediately.

• They make the star change color constantly.

• They prevent the star from forming at all.

Open Ended

Describe the process by which a star is formed and the role of gravity and fusion in its life cycle.

Open Ended

Reflecting on what you have learned about the life cycle of stars, what is one question you still have or something you would like to know more about?

Multiple Choice

What are the possible final stages in the life cycle of a star?

• Black hole and neutron star

• White dwarf and red giant

• Supernova and main sequence

• Protostar and planetary nebula