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