Across
- 2. telescope that collects infrared waves in space
- 3. developed the first hand-held telescope
- 4. earth is part of the ________, or terrestrial planets
- 7. the _______ planets are composed of gas and ice
- 9. rock leftovers of past collisions
Down
- 1. developed the first large scale telescope that uses mirrors
- 3. the force of ____________ is what causes nuclear fusion to take place
- 5. the part of the sun where nuclear fusion is taking place
- 6. composed of minerals, gas, and ice
- 8. the milky way ________ is where our sun is located