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Across 3. Is visible in the Spring - A constellation in the Northern Hemisphere near Cancer and Virgo, containing the bright stars Regulus and Denebola. 6. Visible in Autumn - A winged horse that with a stroke of his hoof caused the fountain Hippocrene to spring forth from Mount Helicon, and a constellation in the Northern Hemisphere near Aquarius and Andromeda 7. The Greek word for "wandering stars" 8. A large collection of matter that gives off huge amounts of energy. 10. The Greek word for "animal sign". 11. The study of what is beyond Earth. 13. A group of stars which form images that poets, farmers and astronomers have made up over the past 6,000 years. 15. Gives off its own self-generated light. 16. Part of the Ursa Major, a constellation also called the Great Bear. 17. This is visible in the summertime and is known as the bird who brought rain and the keeper of Zeus' lightning bolts. 18. All matter and energy, including the earth, the galaxies, and the contents of intergalactic space, regarded as a whole. 19. The Sun and all the and all the objects traveling around it, including the nine known planets and the mooms of those planets.

Down 1. A generally spherical piece of matter, that revolves around a star. 2. A constellation named after an animal. 4. An imaginary straight line that cuts across the centre of the Earth and joins the North and South Pole. 5. The travelling of one object moving around another. 9. When an object spins around its axis. 12. Does not emit its own light 14. Visible in the Wintertime - He is the master of the winter skies and lords over the heavens from late fall to early spring, with his hunting dog Sirius trailing at his feet.