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Across 3. a rock which usually orbits the sun 5. its an object that orbits a planet 7. how heavy a object is for the amount of space it takes up 9. gas that a planets gravity holds to its surface 11. a collection of many solar systems, stars and other space objects 12. the only planet that we know of the supports life 13. it ranges from hot to cold 15. a place where we use a telescope to oberve space 17. somthing that is usually formed from a star 18. they usually revolve around a star 19. things that have to do with the sun

Down 1. it emits light and is very hot 2. a groups of a stars which appear to form a shape to us 3. lights in the sky which are cause by solar flares from the sun 4. a form of light which can be very dangerous to us 6. a small object that revolves around another one 8. repetitive changes of an object 10. a revolving action which is caused by gravitation pull 14. a icy object which leaves a trail 16. when a veiw of a object is obstructed by another object 17. things that have to do with the moon