rocks, say yay :)

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Across
  1. 2. a measure of how non-circular the orbit of a body is.
  2. 6. a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
  3. 7. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
  4. 9. a region of the solar system beyond the orbit of Neptune, believed to contain many comets, asteroids, and other small bodies made largely of ice.
  5. 10. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
  6. 12. long cliffs on mercury's surface. Create after lava on mercury cooled and after it cooled, mercury's crust contracted to form scarps.
  7. 14. a large planet mostly composed of helium and/or hydrogen. These planets, like Jupiter and Saturn in our solar system, don't have hard surfaces and instead have swirling gases above a solid core.
  8. 15. a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
  9. 17. the dark bands
Down
  1. 1. a fundamental system in condensed matter sciences and the main constituent of gas giant planets.
  2. 3. a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun
  3. 4. the reflective white bands of low temperatures, elevated aerosol opacities, and enhancements of quasi-conserved chemical tracers
  4. 5. Earth-like planets made up of rocks or metals with a hard surface
  5. 8. actual or apparent motion of a body in a direction opposite to that of the motions of most members of the solar system or of other astronomical systems with a preferred direction of motion.
  6. 11. Any of innumerable small bodies of accreted gas and dust thought to have orbited the Sun during the formation of the planets.
  7. 13. a region of the solar system beyond the orbit of Neptune, believed to contain many comets, asteroids, and other small bodies made largely of ice.
  8. 16. the locus of all points such that the sum of the distances from two foci to any point on the ellipse is a constant