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Across 2. Root meaning “place” 3. The measurement of one side of a circle to another through its center 6. Einstein’s theory of gravity and space-time 9. A _____ is a push or a pull! 10. An object not large enough to clear orbiting debris, therefore not classified as a planet 11. Root meaning “wandering planet” 12. The planet fourth from the Sun 13. A large collection of stars, gas and dust 14. The effect of microgravity 16. A map using colors different from a photograph to represent features 18. Any object orbiting another object 19. The process that produces light and heat in stars such as the Sun 23. In the order of time 24. Root meaning “star” 26. The process of data collection without physical contact 28. A vehicle designed to travel beyond Earth’s atmosphere 30. Our solar system’s hottest planet 31. Darker, cooler areas of the Sun 32. Neptune’s _________ period is 60,193 Earth days. 33. The amount of material in an object 34. Everything that exists in space 36. Root meaning “to measure” 38. “Dirty snowball”

Down 1. A bright, hot, compressed body of gas 4. In Einstein’s theory of general relativity, all objects are _______ to each other. 5. Galileo, Hale, Leavitt, and Hubble made discoveries with this important tool 7. The distance from Earth to the Sun is one __________. 8. Root meaning “to write or draw” 12. A representation of a system or object to understand it 15. A piece of space rock that reaches Earth’s surface 17. Root meaning “sun” 20. Ours consists of eight planets. 21. A mission with the purpose to explore Jupiter’s moon 22. An object’s path around another object 24. The study of events and objects beyond Earth’s atmosphere 25. Relating to the stars and/or the heavens 27. a planet's natural satellite 29. An object orbiting a star that isn’t a satellite 35. Root meaning “to view, observe” 37. Root meaning “far”