What temperature is required for fusion reactions to occur in the Sun's core?

• Over 6,000 degrees Celsius

• Approximately 15 million degrees Kelvin

• 265 billion atmospheres

• 150 grams per cubic centimeter

What fundamental force causes protons to repel each other when they get close?

• Gravitational force

• Strong nuclear force

• Electromagnetic force

• Weak nuclear force

What is the heavy form of hydrogen produced during the first fusion event in the Sun's core?

• Helium-3

• Deuterium

• Tritium

• Neutrino

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What is the most common and final form of Helium produced by the Sun's fusion reactions?

• Helium-3

• Deuterium

• Helium-4

• Tritium