Across
- 4. a streak of light in the sky caused by a meteoroid crashing through Earth's atmosphere.
- 5. a region of space between the orbits of Mars and Jupiter where most of the asteroids in our Solar System are found orbiting the Sun.
- 8. belt a doughnut-shaped region of icy objects beyond the orbit of Neptune.
- 10. a rock-type object formed in the early solar system from collisions with other objects in the solar system.
- 14. planet Earth-like planets made up of rocks or metals with a hard surface.
- 16. Planet a celestial body that orbits around the Sun
- 18. a circle that has been squashed or flattened a bit.
Down
- 1. space rocks, which are found on Earth after they fall from the sky.
- 2. unit the mean distance between the center of the Earth and the center of the sun.
- 3. motion the orbital motion of a spatial body in a direction that is opposite of what is normal in a given system.
- 6. lumps of rock or iron that orbit the sun
- 7. a small, icy object that orbits the sun and has a long "tail" of gas.
- 9. giant planet a large planet mostly composed of helium and/or hydrogen.
- 11. a line of cliffs formed by the faulting or fracturing of the earth's crust; an escarpment.
- 12. shower when the Earth passes through the dusty debris that was left behind by comets or asteroids
- 13. the amount by which an orbit deviates from a perfect circle.
- 15. metallic hydrogen a fundamental system in condensed matter sciences and the main constituent of gas giant planets.
- 17. the expanse that exists beyond Earth and its atmosphere and between celestial bodies.