Dusty Per.1

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Across
  1. 5. a circumstellar disc in the outer Solar System, extending from the orbit of Neptune
  2. 6. The planets Mercury, Venus, Earth, and Mars are
  3. 8. is a celestial event in which a number of meteors are observed
  4. 11. When a planet does not meet the three rquirments
  5. 12. the apparent motion of a planet in a direction opposite to that of other bodies within its system
  6. 13. a measure of how circular an orbit is
  7. 14. are long, curvilinear structures found on some planetary bodies
  8. 16. Planets in our solar system travel on this
  9. 17. is a large planet mostly composed of helium and/or hydrogen
Down
  1. 1. is a fundamental system in condensed matter sciences and the main constituent of gas giant planets
  2. 2. is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun
  3. 3. a body that could or did come together with many others under gravitation to form a planet
  4. 4. a region of space between the orbits of Mars and Jupiter
  5. 7. When the meteoroid hits Earth's surface it turn into
  6. 8. A small body moving in the solar system that can turn into a meteor
  7. 9. This is when a meteoroid enters Earth's atmosphere it turns into a
  8. 10. Cloud activity on planets such as jupiter
  9. 15. How we measure distance in space