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Astronomy & space · Grades 3–8

Planet facts

Study guide for Grades 3 to 8: 2 worked examples and 2 practice questions. Each planet has features that help identify it: size, colour, rings, temperature and distance from the Sun.

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Rule and key idea

Each planet has features that help identify it: size, colour, rings, temperature and distance from the Sun.

Worked examples

How many planets are in our solar system?

There are eight planets. Pluto is classified as a dwarf planet.

8

Which planet is the only one known to have liquid water oceans on its surface and living things?

Earth is the only planet known to have surface oceans and life.

Earth

Try two questions

  1. Which planet spins tipped over on its side?

    1. Mars
    2. Mercury
    3. Earth
    4. Uranus

  2. Which planet has the hottest surface?

    1. Venus
    2. Mars
    3. Mercury
    4. Jupiter

Answers and reasoning

Answers and marking notes
  1. Uranus

    Uranus’s axis is tilted by about 98 degrees, so it spins almost on its side.

  2. Venus

    Venus’s thick carbon dioxide atmosphere traps heat, so it is hotter than Mercury even though Mercury is closer to the Sun.

How this page was made: written for StudyBrix with AI assistance from our own templates. Answers and worked examples are checked by automated tests, and grade bands are approximate, not an official curriculum alignment. See the editorial policy for corrections. Editorial policy