Space: What We Know About the Planets
A short quiz for kids aged 6 to 10 that shows why planets move, shine, and look different from each other. Every answer comes with a one-sentence explanation.
Space isn't just pretty dots in the dark — out there, everything moves by rules. In this quiz you'll find out why some planets are hot and others icy, why the Moon shines even though it has no light of its own, and why Earth has day and night. Take your time: it's not about remembering, it's about figuring it out.
Quiz: The Planets and the Solar System
1. What do Earth and the other planets in our Solar System orbit around?
- The Sun
- The Moon
- The North Star
Answer
The Sun
The Sun is far more massive than the planets, and its pull keeps each one moving along its orbit.
2. The Moon has no light of its own. So why do we see it shining at night?
- Because it reflects the Sun's light
- Because it's glowing hot inside like a fire
- Because it's made of ice that sparkles on its own
Answer
Because it reflects the Sun's light
The Moon works like a mirror — the Sun lights it up, and we see the light bouncing back.
3. Why does Earth have day and then night?
- Because Earth spins on its axis and turns different sides toward the Sun
- Because the Sun switches off in the evening and switches on in the morning
- Because clouds cover the Sun at night
Answer
Because Earth spins on its axis and turns different sides toward the Sun
The side facing the Sun has day, and the side in shadow has night, and this swaps with every turn.
4. Mercury is the closest planet to the Sun, and Neptune is the farthest. Which of the two is colder?
- Neptune
- Mercury
- They're both equally warm
Answer
Neptune
The farther a planet is from the Sun, the less heat it receives.
5. If an astronaut drops a little rock on the Moon, it falls slowly and gently. What does this tell us?
- That the Moon's gravity is weaker than Earth's
- That the Moon has no gravity at all
- That rocks on the Moon are weightless everywhere in the universe
Answer
That the Moon's gravity is weaker than Earth's
The Moon is smaller than Earth, so it pulls on things more weakly, and they fall more slowly.
6. Jupiter is a gas giant. What would happen to a spaceship that tried to 'land' on it?
- It wouldn't find solid ground and would sink into thick gas
- It would land on flat rock like on Mars
- It would slide across a frozen ocean of water
Answer
It wouldn't find solid ground and would sink into thick gas
Jupiter is made mostly of gas, so there's no solid ground there to land on.
7. A year on Mars is longer than a year on Earth. What's the most likely reason?
- Mars is farther from the Sun and travels a longer path around it
- Mars spins more slowly on its own axis
- Mars stops moving during winter
Answer
Mars is farther from the Sun and travels a longer path around it
A year is one full trip around the Sun, and a farther orbit is a longer trip.
8. An astronaut steps onto a planet where the sky is dark even at noon and there's no sound at all. What's missing there?
- An atmosphere — a layer of air around the planet
- Sunlight
- Gravity
Answer
An atmosphere — a layer of air around the planet
Air scatters light and carries sound, so without an atmosphere the sky is black and everything is silent.