Star Life Cycle Review

Stars are born in clouds of gas and dust called...

• Planetary nebulae

• Stellar (or star-forming) nebulae

• Supernovae

• Black holes

The force that pulls a stellar nebula together.

• Strong nuclear force

• Nuclear fission

• Nuclear fusion

• Gravity

The adult phase of the star life cycle, where stars spend most of their time.

• Main sequence

• Red giant

• Planetary nebula

• Stellar nebula

Tags

NGSS.HS-ESS1-1

Main sequence stars give off heat and light because they are powered by _____ reactions.

• Oxidation-reduction

• Acid-base

• Nuclear fusion

• Nuclear fission

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

True or False: In a main sequence star, the force of nuclear fusion overwhelms the force of gravity, causing the star to expand.

• True

• False

Tags

NGSS.HS-ESS1-1

During main sequence, stars fuse _____ atoms into _____ atoms.

• Hydrogen, helium

• Silver, gold

• Carbon, Nitrogen

• Helium, hydrogen

Tags

NGSS.HS-ESS1-1

When main sequence stars run out of hydrogen fuel, they start fusing heavier elements and grow larger. This is the _____ phase.

• Supernova

• White dwarf

• Planetary nebula

• Red giant

Which star color is the hottest?

• Blue

• White

• Yellow

• Red

Which color star is the coolest?

• Blue

• White

• Yellow

• Red

True or false: In the red giant (or red supergiant) phase, the force of nuclear fusion becomes stronger than the force of gravity.

• True

• False