Across
- 2. any object that orbits around another object in space
- 4. the spinning motion of a planet on its axis
- 5. the force that pulls objects toward each other
- 8. a device expels gas in one direction to move in the opposite direction
- 9. Zone the outermost layer of the sun's interior
- 10. Fusion the process by which hydrogen atoms join together in the sun's core to form helium
- 15. the inner layer of the sun's atmosphere that gives off its visible light
- 17. a meteoroid that passes through the atmosphere and hit Earth's surface
- 18. the partial or total blocking one object in space by another
- 20. a chunk of rock or dust in space
- 21. the outer layer of the sun's atmosphere
- 22. Zone a region of very tightly packed gas in the sun's interior where energy is transferred mainly in the form of light
- 23. a dark area of gas on the sun's surface that is cooler than surrounding gases
- 25. an oval shape, which may be elongated or nearly circular
- 27. Cloud a spherical region of comets that surrounds the solar system
Down
- 1. the study of stars, moons, and other space objects
- 3. the tendency of an object to resist any change in its motion
- 4. the movement of an object around another object
- 6. the middle layer of the sun's atmosphere
- 7. the central region of the sun, nuclear fusion takes place
- 11. Belt the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found
- 12. Belt a doughnut-shaped region that stretches from beyond Neptune's orbit to about 100 times Earth's distance from the sun
- 13. rocky objects revolving around the sun that are too small and numerous to be considered planets
- 14. Effect the trapping of heat by the planet's atmosphere
- 16. a huge, reddish loop of gas that protrudes from the sun's surface, linking parts of sunspot regions
- 17. a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
- 19. a loose collection of ice, dust, and small rocky particles, typically with long, narrow orbit
- 24. the path of an object as it revolves around another object in space
- 26. Flare an eruption of gas from the sun's surface that occurs when the loops in sunspot regions suddenly connect