Stars are made mostly of hydrogen and helium. Both are very light gases, but a star contains so much hydrogen and helium that its total mass is enormous. The pressure at the center of a star is great enough to heat the gases. This causes nuclear fusion reactions.
Stars are made mostly of hydrogen and helium. Both are very light gases, but a star contains so much hydrogen and helium that its total mass is enormous. The pressure at the center of a star is great enough to heat the gases. This causes nuclear fusion reactions.
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Answer:
Stars are made mostly of hydrogen and helium. Both are very light gases, but a star contains so much hydrogen and helium that its total mass is enormous. The pressure at the center of a star is great enough to heat the gases. This causes nuclear fusion reactions.
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Answer:
Stars are made mostly of hydrogen and helium. Both are very light gases, but a star contains so much hydrogen and helium that its total mass is enormous. The pressure at the center of a star is great enough to heat the gases. This causes nuclear fusion reactions.