The Sun

What is the primary energy source of the Sun?

• Chemical reactions
• Nuclear fusion
• Gravitational contraction
• Solar wind

What is the Sun mainly composed of?

• Oxygen
• Hydrogen and Helium
• Carbon and Nitrogen
• Iron

What percentage of the Sun’s energy is in the form of visible light?

• 0.1
• 0.25
• 0.4
• 0.7

What is the approximate surface temperature of the Sun?

• 1000 K
• 5800 K
• 10,000 K
• 1,000,000 K

What happens when the Sun runs out of hydrogen fuel?

• It becomes a black hole
• It turns into a red giant
• It explodes immediately
• It becomes a neutron star

What force keeps planets in orbit around the Sun?

• Magnetic force
• Nuclear force
• Gravitational force
• Electrical force

What is the term for the outermost layer of the Sun?

• Core
• Corona
• Photosphere
• Chromosphere

What will be the final stage of the Sun's life cycle?

• Supernova
• White dwarf
• Neutron star
• Red supergiant

What protects Earth from the Sun’s harmful UV radiation?

• Earth's gravity
• The Moon
• The ozone layer
• The Earth's magnetic field

What is the Sun’s current stage in its life cycle?

• Red Giant
• White Dwarf
• Main Sequence
• Black Hole