P8.2 AQA Life Cycle of Stars

What is the initial stage of a star's life cycle called?

• Red giant

• Main sequence star

• Protostar

• Nebula

What force pulls dust and gas together to form a protostar?

• Electromagnetic force

• Nuclear force

• Gravity

• Centrifugal force

What process occurs when hydrogen nuclei fuse to form helium nuclei?

• Chemical reaction

• Radioactive decay

• Nuclear fission

• Nuclear fusion

What is the stage called when a star is in a long stable period?

• White dwarf

• Red giant

• Main sequence star

• Protostar

What happens when a star runs out of hydrogen?

• It becomes a black hole

• It becomes a neutron star

• It contracts and then expands again

• It explodes immediately

What is formed when a small to medium star like our sun expands?

• Red supergiant

• Neutron star

• Red giant

• White dwarf

What is the final stage of a white dwarf?

• Red giant

• Black dwarf

• Black hole

• Neutron star

What happens to a red supergiant after several cycles of expansion and contraction?

• It explodes in a supernova

• It becomes a black dwarf

• It becomes a white dwarf

• It forms a nebula

What is formed if a very big star condenses after a supernova?

• Red giant

• Black dwarf

• White dwarf

• Neutron star

What is the final stage of a truly massive star?

• Neutron star

• Black hole

• White dwarf

• Red supergiant