What causes the immense gravitational pressure within the Sun's core?

• The Sun's rapid rotation.

• The fusion of hydrogen into helium.

• The vast amount of mass in the Sun.

• Magnetic fields.

What process occurs in the Sun's core to release energy?

• Combustion of hydrogen

• Nuclear fission of helium

• Nuclear fusion of hydrogen into helium

• Chemical reactions

Approximately how long does it take for photons to travel from the Sun's surface to Earth?

• Thousands of years

• 8.5 minutes

• Several days

• One hour

What form of energy is released from the Sun and travels to Earth?

• Sound waves

• Thermal energy

• Electromagnetic radiation

• Kinetic energy

What two types of fields alternate to push electromagnetic waves forward?

• Gravitational and electrical fields

• Magnetic and gravitational fields

• Electric and magnetic fields

• Thermal and light fields

What is the relationship between the wavelength of light and its energy?

• Shorter wavelength means less energy.

• Longer wavelength means more energy.

• Shorter wavelength means more energy.

• Wavelength and energy are unrelated.

What term describes the entire range of possible wavelengths of electromagnetic radiation?

• Visible light range

• Light spectrum

• Electromagnetic spectrum

• Radiation band

Which part of the electromagnetic spectrum can human eyes detect?

• Infrared light

• Ultraviolet light

• Visible light

• X-rays

What is a limitation of observing the Sun using only visible light?

• Visible light is too bright to observe.

• Only a limited amount of information can be gathered.

• Visible light damages telescopes.

• Visible light cannot penetrate Earth's atmosphere.

How has modern astronomy improved our understanding of the Sun compared to early observations?

• By using stronger magnifying lenses.

• By observing only visible light more closely.

• By seeing a much wider range of wavelengths.

• By sending humans to the Sun.