The Sun: Crash Course Astronomy #10

How does the Sun compare in size and mass to Earth?

• The Sun is about 10 times the Earth's diameter and 30,000 times more massive.

• The Sun is about 100 times the Earth's diameter and 300,000 times more massive.

• The Sun is about 1,000 times the Earth's diameter and 3,000,000 times more massive.

• The Sun is about 10,000 times the Earth's diameter and 30,000,000 times more massive.

What are the approximate temperature and pressure conditions in the Sun's core?

• 1.5 million degrees Celsius and 26 billion times Earth's atmospheric pressure.

• 15 million degrees Celsius and 260 billion times Earth's atmospheric pressure.

• 150 million degrees Celsius and 2.6 trillion times Earth's atmospheric pressure.

• 1.5 billion degrees Celsius and 26 trillion times Earth's atmospheric pressure.

What process is responsible for the Sun's energy production?

• Chemical combustion of hydrogen and oxygen.

• Gravitational collapse of hydrogen gas.

• Nuclear fusion of hydrogen into helium.

• Nuclear fission of heavy elements.

Approximately how long does it take for energy generated in the Sun's core to reach its surface as light?

• About 8 minutes.

• About 100 to 200 years.

• About 1,000 to 2,000 years.

• About 100,000 to 200,000 years.

What is the primary reason the Sun is composed of plasma rather than ordinary gas?

• The Sun's immense gravitational pull compresses the gas into plasma.

• Nuclear fusion reactions convert gas directly into plasma.

• The extreme heat within the Sun strips electrons from atoms, creating charged particles.

• Solar winds constantly bombard the Sun's surface, ionizing the gas.

How do sunspots form on the Sun's surface?

• They are areas where the Sun's surface has cooled due to a lack of nuclear fusion.

• They are caused by meteoroid impacts that create dark depressions.

• Tangled magnetic loops prevent plasma from sinking back into the Sun, causing it to cool and dim.

• They are regions of intense solar flares that have temporarily exhausted their energy.

What is the main difference between a solar flare and a coronal mass ejection (CME)?

• Solar flares release only light, while CMEs release only charged particles.

• Solar flares are localized and intense, while CMEs are huge and occur higher off the Sun's surface.

• Solar flares are caused by nuclear reactions, while CMEs are caused by magnetic reconnections.

• Solar flares are visible from Earth, but CMEs can only be detected by spacecraft.

What is a potential negative impact of a powerful solar storm on Earth's infrastructure?

• Increased global temperatures due to enhanced solar radiation.

• Disruption of satellite communications and power grid blackouts.

• Accelerated melting of polar ice caps.

• Increased seismic activity and volcanic eruptions.