What is the initial stage of star formation, consisting of a cloud of dust and hydrogen gas?

• Protostar

• Stellar Nebula

• Red Giant

• White Dwarf

What characterizes a main sequence star?

• Outward pressure from fusion is less than inward gravity.

• It is primarily fusing helium into heavier elements.

• Outward pressure from fusion counteracts the force of gravity.

• It is rapidly expanding into a red giant.

What happens to a small star like our Sun when its hydrogen fuel begins to run out?

• It collapses into a black hole.

• It expands into a Red Giant.

• It becomes a neutron star.

• It immediately forms a white dwarf.

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What event allows for the creation of elements heavier than iron?

• The formation of a protostar.

• Nuclear fusion in a main sequence star.

• A supernova explosion.

• The cooling of a white dwarf.