Astronomy Facts for Kids

Today, let’s journey into the vast universe and explore some amazing astronomy facts tailored for young explorers. Astronomy is the scientific study of celestial bodies like stars, planets, comets, and galaxies. It gives us insights into the workings of our universe, from the enormous solar system to distant cosmic phenomena. Curious to learn more? Read below for cool astronomy facts for kids. You can check out all of the Fact of the Day for Kids here.


  1. The Sun is over 300,000 times larger than Earth.
  2. You could fit 1.3 million Earths inside the Sun.
  3. Jupiter is the largest planet in our solar system, so big that all the other planets could fit inside it.
  4. Venus is the hottest planet in our solar system, with temperatures reaching up to 870 degrees Fahrenheit.
  5. A year on Mercury lasts just 88 Earth days. This means that two years on Mercury lasts for only three days.
  6. Saturn isn’t the only ringed planet; Jupiter, Uranus, and Neptune have rings too!
  7. The light from the Sun takes about 8 minutes and 20 seconds to reach Earth.
  8. There are more stars in the universe than grains of sand on all of Earth’s beaches.
  9. A day on Venus is longer than a year on Venus; it takes 243 Earth days to rotate once but only 225 Earth days to orbit the Sun.
  10. Black holes are so strong that not even light can escape their gravity.


Discover the wonders of the universe right from your classroom or school! Here are some exciting activities to get students engaged with astronomy:

  • Try this Astronomy Word Search free printable.
  • Create simple constellations using star stickers and black paper.
  • Build a model of the solar system with different sized balls.
  • Use a telescope to observe the moon and discuss its phases.
  • Make a comet with dry ice and materials to simulate its icy core and tail.
  • Draw and color the different planets and discuss their unique features.


Let’s dive deeper into the mysteries of space. Think about these questions to expand your understanding of astronomy:

  • How do we calculate the distance from Earth to other planets?
  • What would happen if the Sun suddenly disappeared?
  • Why do planets orbit the Sun in an elliptical shape?
  • What is the significance of discovering water on other planets?
  • How do scientists use light to study distant stars and galaxies?


Here are five questions to spark conversation. Would you rather…

  • Explore the surface of Mars or fly through the rings of Saturn?
  • Be an astronaut on the International Space Station for a year or a deep-sea explorer on Earth for a month?
  • Have the ability to time travel to witness the Big Bang or see the future of our universe?
  • Own a telescope that can see into the most distant galaxies or a submarine that can explore the deepest oceans on Earth?
  • Live on a space station with a view of Earth or in a submarine exploring ancient shipwrecks?


Here are more fun ideas to help keep the kids entertained: