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Mars facts for kids

The planet Mars

Mars, the Red Planet, is one of Earth's two neighbour planets. Find out why it is red, how long its days and years are, what robots are doing there, and test yourself with a quick quiz.

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Meet Mars

Mars is the fourth planet from the Sun, the next one out after Earth. It is a rocky planet, about half as wide as Earth.

It is known as the Red Planet. Mars looks red because its dusty ground is full of rust.

Days and years on Mars

A day on Mars lasts just over 24 and a half hours. A year on Mars, one trip round the Sun, lasts 687 Earth days.

Moons and mountains

Mars has two small moons, called Phobos and Deimos.

Mars has the tallest volcano in the Solar System. Olympus Mons on Mars is about two and a half times as tall as Mount Everest.

Robots on Mars

Robot rovers called Curiosity and Perseverance drive about on Mars. Perseverance landed on Mars in 2021, carrying a little helicopter called Ingenuity.

Beyond Mars

The main asteroid belt lies between Mars and Jupiter. Despite what films show, the asteroid belt is mostly empty space. Spacecraft have flown through it safely many times.

Mars in a nutshell

Quick quiz: Mars

Try these, then tap Show answer under each one.

  1. Why does Mars look red?

    • It is on fire
    • Its dusty ground is full of rust
    • It is covered in red seas
    • It is made of red glass

    Its dusty ground is full of rust.

  2. How many moons does Mars have?

    • None
    • One
    • Two
    • Five

    Two. They are called Phobos and Deimos.

  3. True or false: a year on Mars is shorter than a year on Earth.

    False. A year on Mars lasts 687 Earth days.

  4. What is Olympus Mons?

    • A crater on the Moon
    • The tallest volcano in the Solar System
    • A rover on Mars
    • A moon of Jupiter

    The tallest volcano in the Solar System. Olympus Mons on Mars is about two and a half times as tall as Mount Everest.

  5. What lies between Mars and Jupiter?

    • The Sun
    • Earth
    • The main asteroid belt
    • Saturn's rings

    The main asteroid belt.

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