Space Science quiz worksheet with multiple-choice questions about celestial bodies and the solar system.

Let’s go through each question one by one, step by step.

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Question 1:
> If an object in space orbits around the sun, is larger than Earth, cold, and has an atmosphere of gas, what is it?

- Comets are small, icy, and not larger than Earth → ✘ A
- Asteroids are rocky, usually smaller than Earth, no thick gas atmosphere → B
- Stars are hot and produce light — this object is “cold” → D
- Planets can be large (like Jupiter), orbit the Sun, be cold (if far from Sun), and have gas atmospheres → ✔ C

✔️ Answer: C — a planet

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Question 2:
> What is the Milky Way?

- Solar system = our Sun + planets → too small → ✘ A
- Star = single glowing ball of gas → Milky Way is made of billions of stars → ✘ B
- Candy bar = joke option 😄 → ✘ C
- Galaxy = huge collection of stars, dust, gas — that’s exactly what the Milky Way is → ✔ D

✔️ Answer: D — a galaxy

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Question 3:
> What is a planet?

- Gas and bright? That sounds more like a star → ✘ A
- Just “a rock”? Too vague — moons and asteroids are also rocks → ✘ B
- Object that revolves around a star in its own orbit → YES! That’s the basic definition → ✔ C
- Rotates with moons? Not all planets have moons, and rotation isn’t the defining feature → ✘ D

✔️ Answer: C — object that revolves around a star in its own orbit

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Question 4:
> What planets are the inner planets?

Inner planets = closest to the Sun: Mercury, Venus, Earth, Mars
Outer planets = farther out: Jupiter, Saturn, Uranus, Neptune
Pluto is a dwarf planet, not counted as inner or outer in standard classification.

Check options:
- A: Earth, Mars, Neptune, Pluto → Neptune & Pluto are outer → ✘
- B: Jupiter, Saturn, Uranus, Neptune → all outer → ✘
- C: Jupiter, Earth, Mars, Venus → Jupiter is outer → ✘
- D: Earth, Mars, Mercury, Venus → YES! All four inner planets → ✔

✔️ Answer: D — Earth, Mars, Mercury, Venus

*(Note: Order doesn’t matter — these are the correct four.)*

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Question 5:
> What are the outer planets?

Outer planets = Jupiter, Saturn, Uranus, Neptune
(Pluto is not considered a planet anymore, so we don’t include it unless specified.)

Check options:
- A: Mars, Jupiter, Saturn, Earth → Mars & Earth are inner → ✘
- B: Mars, Jupiter, Saturn, Uranus → Mars is inner → ✘
- C: Jupiter, Saturn, Uranus, Neptune → PERFECT → ✔
- D: Jupiter, Saturn, Neptune, Pluto → Pluto is not a full planet → ✘

✔️ Answer: C — Jupiter, Saturn, Uranus, Neptune

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Question 6:
> What are the outer planets made of?

Outer planets are called “gas giants” (Jupiter, Saturn) and “ice giants” (Uranus, Neptune). They’re mostly made of gases like hydrogen and helium, plus some ices (water, ammonia, methane) deep inside — but their main composition is gas.

Check options:
- A: hydrogen and helium gases → YES! Main components → ✔
- B: rock, with gaseous atmospheres → That describes inner planets better → ✘
- C: water → Only part of ice giants, not primary → ✘
- D: rock → Inner planets are rocky → ✘

✔️ Answer: A — hydrogen and helium gases

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Final Answer:

1. C
2. D
3. C
4. D
5. C
6. A