Across
- 2. streak is of light produced when a meteoroid falls towards Earth and burns up
- 4. space objects are built of solid particles that can form planets through collisions and mergers
- 9. a line of cliffs produced by erosion or faulting
- 10. occurs when Earth intersects a cometary orbit and comet particles burn up as they enter Earth's upper atmosphere
- 11. high, cool, light-colored cloud that rises and flows rapidly in the Jovian atmosphere
- 12. due to its gravity, and spherical shape, orbits the Sun, isn't a satellite, and has not cleared the area of its orbit of smaller debris
- 14. form of hydrogen with both liquid and metallic properties that exists as a layer in the Jovian atmosphere
- 16. rocky-surfaced, relatively small, dense inner planets closest to the Sun
- 17. piece of interplanetary material that falls towards Earth and enters its atmosphere
- 18. large, gaseous planet that is very cold at its surface; has a ring system, many moons, and lacks solid surfaces
Down
- 1. region of space that lies outside the orbit of Neptune, 30 to 50 AU from the Sun, where small solar system bodies are mostly rock and ice.
- 3. an oval that is centered on two points called foci; the shape of planets' orbits
- 5. ratio of the distance between the foci to the length of the major axis; defines the shape of the planet's elliptical orbit
- 6. small, eccentrically orbiting body made of rock and ice which have one or more tails that point away from the Sun
- 7. low, warm, dark-colored cloud that sinks and flows rapidly in the Jovian atmosphere
- 8. the average distance between the Sun and Earth
- 13. a planet's apparent backward movement in the sky
- 15. a small fragment of an orbiting body that has fallen to Earth, and doesn't completely burn up, strikes Earth's surface, causing an impact crater