Small print

Sources

Where every fact on planets.im comes from.

• NASA Science: About the Planets, checked 24 Oct 2026. Used for 7 facts.
• NASA Science: Earth Facts, checked 24 Oct 2026. Used for 1 fact.
• NASA Science: Jupiter Facts, checked 24 Oct 2026. Used for 1 fact.
• NASA Science: Mars Facts, checked 24 Oct 2026. Used for 2 facts.
• NASA Science: Mercury Facts, checked 24 Oct 2026. Used for 1 fact.
• NASA Science: Moon Facts, checked 24 Oct 2026. Used for 2 facts.
• NASA Science: Neptune Facts, checked 24 Oct 2026. Used for 3 facts.
• NASA Science: Pluto Facts, checked 24 Oct 2026. Used for 2 facts.
• NASA Science: Saturn Facts, checked 24 Oct 2026. Used for 1 fact.
• NASA Science: Sun Facts, checked 24 Oct 2026. Used for 2 facts.
• NASA Science: Uranus Facts, checked 24 Oct 2026. Used for 2 facts.
• NASA Science: Venus Facts, checked 24 Oct 2026. Used for 2 facts.

We only use facts that stay true, such as the order of the planets, what they’re made of and dates in history. Numbers that change over time, like moon counts, are left out unless we can give a source and the date checked.