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Space, Gravity, and Planets
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Space, Gravity, and Planets
📚 Part 1: Multiple Choice
1. What keeps planets in orbit around the Sun?
Magnetic force
Gravity
Atmosphere
Light pressure
Answer: Gravity
2. Which planet is known as the Red Planet?
Venus
Mars
Jupiter
Mercury
Answer: Mars
3. Which object in our sky is a star?
Moon
Sun
Earth
Pluto
Answer: Sun
4. What happens to your weight on the Moon compared to Earth?
It increases
It decreases
It stays the same
It becomes zero
Answer: It decreases (Moon has weaker gravity)
5. Which planet is famous for its prominent rings?
Earth
Saturn
Mars
Neptune
Answer: Saturn
✏️ Part 2: Short Answers
6. Define gravity in one sentence:
Answer: Gravity is the force of attraction between masses that pulls objects toward one another (on Earth it pulls objects toward the centre of the Earth).
7. Explain why planets orbit the Sun instead of flying off into space:
Answer: A planet's forward motion (inertia) is balanced by the Sun's gravity pulling it inward, producing a curved path or orbit.
8. Which is larger — a planet or a star? Briefly explain:
Answer: A star is larger and much more massive; stars produce energy by nuclear fusion, while planets do not produce their own light.
9. Fill in the blank: The temperature of the Sun's surface is about ________ °C.
Answer: about 5,500 °C
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