8.9A Life cycle of a star

How do stars initially form?

• From the explosion of other stars.

• From massive clouds of dust and gas collapsing under their own gravity.

• From the fusion of hydrogen and helium in empty space.

• From planetary nebulae contracting.

What process generates the energy that powers a star like our Sun?

• Fission of heavy elements.

• Gravitational collapse of its core.

• Fusion of hydrogen atoms into helium.

• Chemical reactions within its atmosphere.

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What is the final stage in the life cycle of a star similar in mass to our Sun?

• Black hole

• Neutron star

• Red giant

• White dwarf

What is the ultimate fate of the most massive stars after a supernova explosion?

• White dwarf

• Planetary nebula

• Black hole

• Red giant