Across
- 2. A cluster of millions of stars
- 4. The death of a large star, exploding, causing expanding gases to glow for weeks.
- 7. The spin of an object on an axis.
- 10. A planet which recently been downgraded to "dwarf planet".
- 11. A small rocky body which sails around space
- 13. Travelling around a planet.
- 14. The distance used to describe how far stars are away from us, the distance that light travels in a year.
- 16. The only planet which is thought to have liquid water on.
- 17. When 1 body goes in front of another, causing the body behind to be blocked from view.
- 19. The only object man has walked on other than Earth.
- 21. System The system which consists of 8 planets and 1 star, the Sun.
Down
- 1. An object which orbits a star.
- 3. Wavelengths of light which are invisible to the naked eye.
- 4. The star that provides heat, light and warmth to the Solar System.
- 5. Layers of gas covering a planet.
- 6. When 1 body strikes another.
- 8. An man-made object orbiting Earth.
- 9. The distance between the Sun and Earth.
- 12. A measurement of temperature, which absolute zero is used as it's minimum
- 15. The smallest unit of life, everything is made of atoms.
- 18. When dark spots appear on the Sun.
- 20. A huge ball of gas held together by gravity.