The Sun

What is the main source of energy for the Sun?

• Nuclear fusion is the main source of energy for the Sun.

• Chemical reactions in the Sun's core.

• Gravitational contraction of the Sun.

• Solar wind interactions with Earth.

What are sunspots?

• Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas.

• Sunspots are permanent features on the Sun's surface that emit more light than the surrounding areas.

• Sunspots are regions on the Sun that are cooler and have a higher concentration of solar flares.

• Sunspots are clouds of gas that form around the Sun and block its light.

What is the corona of the Sun?

• The innermost layer of the Sun's atmosphere.

• The outermost layer of the Sun's atmosphere, visible during a total solar eclipse.

• A type of solar flare that occurs on the Sun's surface.

• The core of the Sun where nuclear fusion takes place.

What is the significance of the Sun's gravitational pull?

• It causes solar flares and sunspots.

• It keeps the planets in orbit around it.

• It influences the Earth's weather patterns.

• It creates the solar wind that affects space travel.

What is the result of nuclear fusion in terms of energy?

• Nuclear fusion releases a significant amount of energy.

• Nuclear fusion absorbs energy from the surroundings.

• Nuclear fusion produces no energy at all.

• Nuclear fusion only releases energy in small amounts.

What process occurs when hydrogen nuclei fuse to form helium nuclei?

• Nuclear fission

• Nuclear fusion

• Radioactive decay

• Chemical reaction

What is a solar eclipse?

• A solar eclipse occurs when the Earth passes between the Moon and the Sun, blocking the Sun's light.

• A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking the Sun's light.

• A solar eclipse occurs when the Sun passes between the Earth and the Moon, blocking the Moon's light.

• A solar eclipse occurs when the Moon reflects sunlight onto the Earth.

What are solar flares?

• Intense explosions on the surface of the Sun that send charged particles toward Earth.

• Gentle emissions of light from the Sun's surface.

• Clouds of gas that form around the Sun's atmosphere.

• Small bursts of energy that occur in the Earth's atmosphere.

What is the difference between nuclear fusion and nuclear fission?

• Nuclear fusion splits heavy nuclei into lighter nuclei, while nuclear fission combines light nuclei to form heavier nuclei.

• Nuclear fusion combines light nuclei to form heavier nuclei, while nuclear fission splits heavy nuclei into lighter nuclei.

• Nuclear fusion and nuclear fission are the same process.

• Nuclear fusion occurs only in stars, while nuclear fission occurs in nuclear reactors.

How many stars are estimated to be in the Milky Way?

• 10 million

• 100 million

• hundreds of billions

• 1 trillion