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Across 3. A period during which the visible surface of the Moon increases 4. Days when hours of sunlight equals the hours of darkness 5. Everything that exists; all matter, energy and space 10. A type of motion where one orbits around another object 13. The average distance between Earth and the Sun =150,000,000 km 17. A large chunk of ice, dust and rock that orbits the Sun 19. A region of stars in the night sky e.g. Ursa Major 21. Bowl shaped holes in surfaces caused by the impact of a celestial object 22. The distance light travels in one year = 9.5 trillion km 23. Dark area on the Sun’s surface that is cooler than the area around it

Down 1. A period during which a visible surface of the moon decreases 2. The model of the Universe in which the sun is in the center 6. A day when the Earth’s axis is most inclined towards or away from the sun 7. The incorrect model in which Earth is the center of the universe 8. A huge explosion of gases and charged particles 9. The universe began in an incredibly hot and dense expansion 14 billion years ago 11. The moon passes between Earth and the Sun and block the light 12. A type of motion where an object turns on its own axis 14. A device with mirrors or lens that lets us look far into space 15. The moon passes through Earth’s shadow and doesn’t reflect as much light 16. Small rocky, irregularly shaped objects orbiting the Sun 18. The North Star located almost directly above the North Pole 20. Collection of gas held together by gravity; create light through nuclear reactions