Life cycle of a Star Beginning Video

What is the primary energy source of a star?

• Gravitational collapse

• Magnetic fields

• Chemical reactions

• Nuclear fusion

What will our Sun become after it expands and swallows the inner planets?

• A white dwarf

• A neutron star

• A red giant

• A black hole

What is the fate of the most massive stars?

• They remain unchanged

• They become white dwarfs

• They become neutron stars or black holes

• They become red giants

Where are elements heavier than hydrogen and helium created?

• Inside stars

• In the Big Bang

• In black holes

• In planetary nebulae

What elements were present in the universe right after the Big Bang?

• All elements

• Iron and nickel

• Hydrogen and helium

• Carbon and oxygen

Briefly Describe the process of nuclear fusion

How does mass play a role in the life cycle of a star?