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Our solar system
Recall key facts about planets, moons and our solar system from a verified question bank. Review suitability for your learners before teaching.
Worksheet StudioPractice pack · Ages 7-9
Our solar system
Take your time. Show your thinking.
1. Which planet is known as the Red Planet?
2. What is Saturn’s largest moon, which has a dense nitrogen-rich atmosphere: Titan or Phobos?
3. What causes the cycle of seasons on Earth: Earth’s tilted axis or changes in the Sun’s size?
4. Which phase of the Moon occurs when the sunlit side faces away from Earth so the Moon appears dark: New Moon or Full Moon?
5. What is the giant storm on Jupiter that has raged for centuries called: the Great Red Spot or the Lunar Mare?
6. What nuclear process in the Sun’s core releases light and heat energy: nuclear fusion of hydrogen into helium, or burning coal?
7. How long does Earth take to complete one full rotation on its axis: 24 hours or 365 days?
8. What galaxy is our solar system located in: the Milky Way or Andromeda?
9. Which four planets closest to the Sun have rocky surfaces (Mercury, Venus, Earth, Mars): terrestrial planets or gas giants?
10. Which phase of the Moon occurs when the entire Earth-facing side is illuminated by sunlight: Full Moon or Crescent Moon?
11. Does the Moon produce its own light or reflect light from the Sun?
12. Which planet is farthest from the Sun among the eight planets: Neptune or Venus?
12 questions · Seed 45 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Our solar system
Answers and reasoning. Review before teaching.
1. Which planet is known as the Red Planet?
MarsIron oxide minerals on Mars give its surface a reddish appearance.
2. What is Saturn’s largest moon, which has a dense nitrogen-rich atmosphere: Titan or Phobos?
TitanTitan is Saturn’s largest moon and the second-largest moon in the solar system.
3. What causes the cycle of seasons on Earth: Earth’s tilted axis or changes in the Sun’s size?
Earth’s tilted axisEarth’s 23.5° axial tilt causes different hemispheres to receive more direct sunlight through the year.
4. Which phase of the Moon occurs when the sunlit side faces away from Earth so the Moon appears dark: New Moon or Full Moon?
New MoonAt New Moon, the Moon lies between Earth and the Sun.
5. What is the giant storm on Jupiter that has raged for centuries called: the Great Red Spot or the Lunar Mare?
Great Red SpotJupiter’s Great Red Spot is a persistent high-pressure anticyclonic storm.
6. What nuclear process in the Sun’s core releases light and heat energy: nuclear fusion of hydrogen into helium, or burning coal?
Nuclear fusion of hydrogen into heliumThe Sun fuses hydrogen nuclei into helium under extreme core temperature and pressure.
7. How long does Earth take to complete one full rotation on its axis: 24 hours or 365 days?
24 hoursEarth rotates once on its axis every 24 hours, giving us day and night.
8. What galaxy is our solar system located in: the Milky Way or Andromeda?
The Milky WayOur solar system is part of the Milky Way spiral galaxy.
9. Which four planets closest to the Sun have rocky surfaces (Mercury, Venus, Earth, Mars): terrestrial planets or gas giants?
Terrestrial planetsThe four inner planets are rocky terrestrial worlds.
10. Which phase of the Moon occurs when the entire Earth-facing side is illuminated by sunlight: Full Moon or Crescent Moon?
Full MoonAt Full Moon, Earth lies between the Sun and the Moon.
11. Does the Moon produce its own light or reflect light from the Sun?
Reflects light from the SunThe Moon shines because its surface reflects sunlight toward Earth.
12. Which planet is farthest from the Sun among the eight planets: Neptune or Venus?
NeptuneNeptune is the eighth and farthest known planet from the Sun.
12 questions · Seed 45 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Our solar system
Take your time. Show your thinking.
1. Which planet is known as the Red Planet?
2. What is Saturn’s largest moon, which has a dense nitrogen-rich atmosphere: Titan or Phobos?
3. What causes the cycle of seasons on Earth: Earth’s tilted axis or changes in the Sun’s size?
4. Which phase of the Moon occurs when the sunlit side faces away from Earth so the Moon appears dark: New Moon or Full Moon?
5. What is the giant storm on Jupiter that has raged for centuries called: the Great Red Spot or the Lunar Mare?
6. What nuclear process in the Sun’s core releases light and heat energy: nuclear fusion of hydrogen into helium, or burning coal?
7. How long does Earth take to complete one full rotation on its axis: 24 hours or 365 days?
8. What galaxy is our solar system located in: the Milky Way or Andromeda?
9. Which four planets closest to the Sun have rocky surfaces (Mercury, Venus, Earth, Mars): terrestrial planets or gas giants?
10. Which phase of the Moon occurs when the entire Earth-facing side is illuminated by sunlight: Full Moon or Crescent Moon?
11. Does the Moon produce its own light or reflect light from the Sun?
12. Which planet is farthest from the Sun among the eight planets: Neptune or Venus?
12 questions · Seed 45 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Our solar system
Answers and reasoning. Review before teaching.
1. Which planet is known as the Red Planet?
MarsIron oxide minerals on Mars give its surface a reddish appearance.
2. What is Saturn’s largest moon, which has a dense nitrogen-rich atmosphere: Titan or Phobos?
TitanTitan is Saturn’s largest moon and the second-largest moon in the solar system.
3. What causes the cycle of seasons on Earth: Earth’s tilted axis or changes in the Sun’s size?
Earth’s tilted axisEarth’s 23.5° axial tilt causes different hemispheres to receive more direct sunlight through the year.
4. Which phase of the Moon occurs when the sunlit side faces away from Earth so the Moon appears dark: New Moon or Full Moon?
New MoonAt New Moon, the Moon lies between Earth and the Sun.
5. What is the giant storm on Jupiter that has raged for centuries called: the Great Red Spot or the Lunar Mare?
Great Red SpotJupiter’s Great Red Spot is a persistent high-pressure anticyclonic storm.
6. What nuclear process in the Sun’s core releases light and heat energy: nuclear fusion of hydrogen into helium, or burning coal?
Nuclear fusion of hydrogen into heliumThe Sun fuses hydrogen nuclei into helium under extreme core temperature and pressure.
7. How long does Earth take to complete one full rotation on its axis: 24 hours or 365 days?
24 hoursEarth rotates once on its axis every 24 hours, giving us day and night.
8. What galaxy is our solar system located in: the Milky Way or Andromeda?
The Milky WayOur solar system is part of the Milky Way spiral galaxy.
9. Which four planets closest to the Sun have rocky surfaces (Mercury, Venus, Earth, Mars): terrestrial planets or gas giants?
Terrestrial planetsThe four inner planets are rocky terrestrial worlds.
10. Which phase of the Moon occurs when the entire Earth-facing side is illuminated by sunlight: Full Moon or Crescent Moon?
Full MoonAt Full Moon, Earth lies between the Sun and the Moon.
11. Does the Moon produce its own light or reflect light from the Sun?
Reflects light from the SunThe Moon shines because its surface reflects sunlight toward Earth.
12. Which planet is farthest from the Sun among the eight planets: Neptune or Venus?
NeptuneNeptune is the eighth and farthest known planet from the Sun.
12 questions · Seed 45 · Age guidance, not curriculum certification