Across
- 2. The seventh planet from the sun,an oddball because it basically orbits on its side.
- 8. A planetary system that includes our sun, and the eight planets, moons, dust and other rocky objects orbiting around it.
- 9. A research field devoted to the study of Earth’s atmosphere and the space beyond or to aircraft that travel in the atmosphere and space.
- 10. A huge ball of gas, with its heat generated by nuclear fusion.
- 13. The envelope of gases surrounding Earth or another planet.
- 14. The sudden expansion of dense matter that marked the beginning of the Universe 13.8 billion years ago
- 15. A system of stars, planets, and dust formed by gravitational attraction
- 16. The tiny particles that make up all matter consisting of a nucleus surrounded by electrons.
Down
- 1. The entire cosmos
- 3. An aged, exploding star
- 4. A clump of matter made from gas and space dust that is so large that it starts to collapse due to its own gravity.
- 5. Any object that exists beyond or comes from outside of Earth
- 6. The disclike, spiral galaxy that contains Earth and our solar system. The Milky Way is about 100,000 light-years across.
- 7. The curved path of a celestial object or spacecraft around a star, planet or moon. One complete circuit around a celestial body.
- 11. The second planet out from the sun, it has a rocky core, just as Earth does.
- 12. An old star in the last phase of life, with a relatively low surface temperature. The star greatly expands and often appears reddish.