Across
- 3. Something that orbits a planet (9 letters)
- 5. A celestial body that emits light, often part of a constellation (4 letters)
Down
- 1. All of space and everything in it (8 letters)
- 2. A collection of stars, dust, and gas bound together by gravity (6 letters).
- 4. The planet we live on (5 letters).