The Solar System

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Across
  1. 4. the process by which dust particles collide, stick together and form larger particles
  2. 7. giants the four outer planets that are composed predominantly of hydrogen and helium
  3. 8. a large object that orbits around the sun
Down
  1. 1. the Sun's layer near it's surface in which hot gases rise, cool and then descend back into the Sun
  2. 2. unit the average distance from the Sun to the Earth, approximately 150,000,000 kilometers
  3. 3. the Sun's outer atmosphere that extends for millions of miles beyond the sun
  4. 5. a small celestial body composed of rock, dust and ice, that orbits the sun
  5. 6. a system of dust, gas and millions of stars held together by gravity: an identifiable cluster of stars and planets