Astronomy

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Across
  1. 2. 4th Solar System planet
  2. 5. A celestial body that orbits the sun, has enough mass to assume a nearly round shape, has not cleared the neighbourhood around its orbit and is not a moon
  3. 7. The ____ is Earth's sole natural satellite and nearest large celestial body
  4. 8. The ___ is the nearest star to Earth
  5. 9. 8th Solar System planet
  6. 11. An astronomical object comprising a luminous spheroid of plasma held together by self-gravity
  7. 12. A system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity
  8. 13. 7th Solar System planet
  9. 14. 5th Solar System planet
  10. 17. A planet outside the Solar System
  11. 19. Small, rocky objects that orbit the Sun
Down
  1. 1. A region of space having a gravitational field so intense that no matter or radiation can escape
  2. 3. A large, rounded astronomical body that is neither a star nor its remnant
  3. 4. 2nd Solar System planet
  4. 6. 6th Solar System planet
  5. 9. A giant cloud of dust and gas in space
  6. 10. A large planet mostly composed of helium and/or hydrogen
  7. 15. 3rd Solar System planet
  8. 16. Well known dwarf planet in the Solar System
  9. 18. 1st Solar System planet