Unit 7 (Life Cycle of a Star, Characteristics of Stars, HR Diag)

What are stars primarily composed of?

• Oxygen and Nitrogen

• Carbon and Oxygen

• Hydrogen and Helium

• Helium and Argon

During which stage does nuclear fusion begin in a star?

• Main Sequence

• Protostar

• Nebula

• White Dwarf

What percentage of stars are in the Main Sequence stage of their life cycle?

• 50%

• 70%

• 90%

• 100%

What is a nebula primarily composed of?

• Oxygen and Nitrogen gas

• Gas and Dust

• Rock and Metal

• Ice and Dust

What is the stage called when a small to medium mass star's fuel begins to run out after the main sequence?

• Red Giant

• Planetary Nebula

• White Dwarf

• Black Dwarf

What occurs during a supernova?

• A star becomes a planet.

• A star cools down.

• An extremely bright explosion of a star.

• A star turns into a black hole.

What is a black hole?

• A star that has cooled down

• A gravitational field so strong that not even light can escape

• A large cloud of gas and dust

• A small, dense star

What determines a star's life cycle?

• Its color

• Its mass

• Its temperature

• Its distance from Earth

Which stage comes after the Red Supergiant in the life cycle of high-mass stars?

• White Dwarf

• Supernova

• Planetary Nebula

• Protostar

What is the next stage after a nebula in the star life cycle?

• Red Giant

• Protostar

• Black Hole

• Neutron Star