Across
- 2. Meteors appear to radiate and come down from the sky. Caused by the Earth going into an orbit of comets and the particles burning in Earth's atmosphere
- 6. Asteroid fragment
- 7. Streak of light
- 8. Ratio of the distance between the foci to the length of the major axis. It defines the shape of a planet's orbit.
- 9. Spherical object that has not cleared its orbit of debris
- 11. Main component of gas giant planets
- 12. Low, warm, dark-colored clouds that sink
- 13. Belt of ice and rock outside the orbit of Neptune
- 14. Formed through colliding particles, these could form planets through collisions
- 17. Line of cliffs by erosion. Mercury has a planet-wide system of these.
- 18. The part that hits the ground if the meteoroid doesn't burn up
Down
- 1. When it seems that a planet is moving backward in the sky
- 3. Four inner planets with solid, rocky surfaces
- 4. Small, icy bodies that have highly eccentric orbits and come from the Oort Cloud
- 5. Planet of helium and/or hydrogen. Examples are Jupiter and Saturn
- 10. Distance between the Sun and Earth
- 15. Oval shape that is centered on two points (called foci)
- 16. High, cool, light-colored clouds that rise