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General Information

• How large is the Sun's radius, compared to the Earth?
• How massive is the Sun, compared with the Earth?
• How far is the Sun from the Earth?
• How long does it take for light to travel from the Sun to the Earth?
• Does the Sun rotate? How long does it take for it to rotate once?
• Is any spacecraft from Earth currently studying the Sun?

Parts of the Sun

• What is the temperature at the Sun's core?
• In which ways can heat be transferred from a hotter to a colder region?
• Why is one part of the Sun's interior called radiation zone?
• Why is one part of the Sun's interior called convection zone?
• What is convection?
• What is the photosphere?
• What are the granules on the Sun's surface due to?
• What is the temperature at the Sun's surface?
• What is the chromosphere?
• What is the corona?
• What is remarkable about the Sun's corona?

Energy Production

• Why doesn't the Sun collapse under its own gravity?
• Where does the Sun get most of its energy from?
• Which is the most abundant element in the Sun?
• Which planets' composition is most similar to that of the Sun?
• What is the proton-proton chain?
• Why is the Sun's energy produced only in the core?

Surface and Activity

• What is the solar wind?
• Why do sunspots appear dark?
• What causes sunspots?
• What features appear occasionally above the Sun's surface?
• How do prominences and flares compare?