Star Formation

What was the primary component of the universe approximately 13.5 billion years ago?

• Helium

• Oxygen

• Hydrogen

• Nitrogen

What critical temperature must hydrogen reach for nuclear fusion to begin and produce energy like a star?

• 1 million degrees

• 10 million degrees

• 100 million degrees

• 1 billion degrees

When hydrogen atoms fuse together in a star, what new, heavier material is primarily formed?

• Carbon

• Oxygen

• Helium

• Iron

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Which of the following statements accurately describes the first stars formed in the early universe?

• They were smaller than our sun and burned red.

• They were similar in size to our sun and burned yellow.

• They were almost a thousand times bigger than our sun and burned deep blue.

• They were composed primarily of helium and burned white.