Planets and the Sun for kids
Sizes, distances and gravity of the eight planets, explained with simple numbers and hands-on activities.
All lessons
The solar system for kids
What is the solar system? The Sun, 8 planets, moons, dwarf planets and asteroids explained simply for kids, with key facts, a memory trick and a free printable worksheet.
The planets in order from the Sun, with facts for each
The 8 planets in order from the Sun with easy facts about each one: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Includes a free printable worksheet.
How much would you weigh on other planets?
Find out why you would weigh less on the Moon and Mars and much more on Jupiter. Gravity for kids, with a weight calculator table and a free printable worksheet.
How big are the planets? Planet sizes for kids
Compare the sizes of all eight planets with Earth: Jupiter is 11 Earths wide! A size table, a fruit scale-model activity and a free printable worksheet.
How long does sunlight take to reach the planets?
Sunlight takes about 8 minutes to reach Earth and over 4 hours to reach Neptune. A kid-friendly table, a walking scale-model activity and a free printable worksheet.
More lessons coming soon.
Take the next step
Fly to the Moon (free)
The free 3D simulator lets kids build a real Moon rocket, launch it and land on the Moon, in any browser.
Play the free demoSpace Workbook for kids
Printable fact sheets, quizzes with answers, a space passport and activities for 29 destinations, with the full simulator included.
See the Space WorkbookFacts: NASA and other space agencies, rounded for readability. Images: Astraviator simulator renders. Astraviator is not affiliated with or endorsed by NASA.