1. One million Earths could fit inside the sun – and the sun is considered an average-size star.

2. Comets are leftovers from the creation of our solar system about 4.5 billion years ago – they consist of sand, ice and carbon dioxide.

3. You wouldn’t be able to walk on Jupiter, Saturn, Uranus or Neptune because they have no solid surface!

4. If you could fly a plane to Pluto, the trip would take more than 800 years!

5. An asteroid about the size of a car enters Earth’s atmosphere roughly once a year – but it burns up before it reaches us.

6. There are more stars in the universe than grains of sand on all the beaches on Earth. That’s at least a billion trillion!

7. The sunset on Mars appears blue.

8. Space is completely silent.

9. The hottest planet in our solar system is 450° C.

10. Nobody knows how many stars are in space.

11. The footprints on the Moon will be there for 100 million years.

12. One day on Venus is longer than one year.

13. The largest known asteroid is 965 km (600 mi) wide.

14. The Sun’s mass takes up 99.86% of the solar system.