SPACE AND PLANETS

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Across
  1. 2. HOLE An object with such strong gravity that nothing, not even light, can escape from it
  2. 4. Fifth planet from the sun, also known as the Gas Giant
  3. 5. An explosion that occurs when a star has reached the end of its life
  4. 7. Seventh planet from the sun, also known as the Ice Giant
  5. 9. Private space exploration company founded by Elon Musk
  6. 10. A person trained to travel in a spacecraft
  7. 11. Fourth planet from the sun, also known as the Red Planet
  8. 14. The path an object takes as it revolves around another object
  9. 15. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  10. 16. An interstellar cloud of gas and dust
  11. 18. A small rocky body orbiting the sun
Down
  1. 1. National Aeronautics and Space Administration, the United States government agency responsible for the space program
  2. 3. Second planet from the sun, also known as the Morning or Evening Star
  3. 5. An object that orbits a planet or other celestial body
  4. 6. Third planet from the sun, the only known planet with life
  5. 8. Sixth planet from the sun, also known for its prominent rings
  6. 12. SYSTEM The collection of eight planets and their moons in orbit around the sun
  7. 13. A vehicle designed for travel or operation outside Earth's atmosphere
  8. 15. Italian astronomer who discovered the four largest moons of Jupiter
  9. 17. A celestial object consisting of a nucleus of ice and dust