Across
- 3. Discovered the first object orbiting other planets
- 6. Inner 4 planets
- 9. Everything in space
- 11. Rock body that revolves around the sun
- 13. Distance from the Sun to Earth
- 15. The process that combines elements
- 16. Measuring distances to other stars based on geometry
Down
- 1. First telescope
- 2. First man made satellite in orbit
- 4. Distance light travels in a year
- 5. Most stars are in this stage
- 7. Manned missions to orbit Earth
- 8. The way we can tell object moving away from us
- 10. An exploding star
- 11. Missions that took astronauts to the moon
- 12. Collections of stars held together by gravity
- 14. Cloud of gas and dust from which stars form