Approximately how old is the Sun?

What is the secondmost abundant element in the universe?

What round object is formed when gas and dust are pulled together by gravity, but before nuclear fusion has begun?

What round object is formed when gas and dust are pulled together by gravity, but before nuclear fusion has begun?

When does a star reach equilibrium?

A ___________ is a massive ball of hot gas (plasma) that creates its own energy via nuclear fusion

In nuclear fusion reaction, the mass of the products is less than the mass of the reactants. What happens to this "missing mass"

What do most stars originally form as?

What is the most abundant element in the universe?

Stars are born, they go through changes, and then they ________.

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