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The Sun

• What is an astronomical unit? What is the value of an astronomical unit?
• What is the Sun? How large is it, and how far is it from the Earth?
• What is the temperature at the Sun's surface? At its center?
• What is the Sun made of? How does it produce energy?
• What are sunspts, flares, and prominences in the Sun?
• In what ways does the Sun affect its environment, including the Earth?
• What is the solar wind?

General Aspects of the Solar System

• Which are the Terrestrial (inner) planets, and which are the Jovian (outer) ones?
• Why has Pluto's status as a planet been questioned?
• Is there a tenth planet beyond Pluto?
• What is the main difference between Terrestrial and Jovian planets?
• What are the asteroids?
• Where are asteroids located? What is the asteroid belt?
• What are comets? Where are they located?
• Which are the farthest confirmed objects in the solar system?
• What is the main difference between comets and asteroids?
• What are meteoroids?
• What is the Kuiper belt?
• What is the Oort cloud?

More Specific Facts

• What is planet conjunction?
• What is planet opposition?
• If a planet has moons and rings, which ones are more likely to be close to the planet?
• Are planets always larger than moons?
• Do any moons in the Solar System have an atmosphere?
• Which planet's orbit differs most from a circle in the plane of the solar system?
• Which planet is furthest from the Sun right now?
• On which planets do we think there is a possibility that life may have existed?
• Is there any moon where we think there is a possibility for life to exist?
• What is the Titius-Bode law?
• What is Phobos? Titan? Mimas? Io? Europa? Ganymede? Callisto? ... Charon?
• Approximately how long ago did the solar system / the planets form?

Summary

• Which of the terrestrial planets have been approached by spacecraft from Earth?
• Which of the Terrestrial planets have spacecraft from Earth landed on?
• Which bodies outside the Earth have humans actually been to?
• Which are the largest two planets in the solar system?
• Which of the terrestrial/jovian planets have moons?
• Why does a terrestrial planet like the Earth have a moon?
• Which of the terrestrial/jovian planets have rings?
• Can a planet have both moons and rings?
• Which of the terrestrial planets has the largest magnetic field?
• Which of the terrestrial planets is most similar to Earth in size?
• Which of the terrestrial planets has the tallest known volcanoes?
• What is the best way to find out what the interior of a terrestrial planet is made of?
• What do astronomers mean when they say that a planet/moon is "active"?