Space and Science Crossword by Mitch

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Across
  1. 2. The planet with the tallest mountain in the solar system.
  2. 4. A piece of rock that makes a streak of light when it enters the atmosphere.
  3. 7. A space rock that does not meet the three criteria to be a planet.
  4. 9. The sun is made mostly of this element.
  5. 11. A dwarf planet that used to be considered a planet.
  6. 12. The basic building block of chemical elements.
  7. 14. Surname of the person who made the first periodic table.
  8. 15. The name of the most poisonous element in the universe.
Down
  1. 1. Rocky, airless remnants sometimes called minor planets.
  2. 3. The element with a chemical symbol 'W'.
  3. 5. The name of the smelliest element.
  4. 6. What forms when a star collapses.
  5. 8. A system of gas, dust and stars held together by gravity.
  6. 10. The 118th element in the periodic table.
  7. 13. The planet with a day that is 5832 hours long.