Across
- 1. reflecting light
- 5. small dense star that is normally the size of a planet
- 6. Theory that describes how the universe is extended
- 8. unit of astronomical distance
- 9. a system with billion and millions of stars; made of ice and dust
- 10. measure of how bright an object is when viewed from standard distance
- 11. young star that is still gathering mass from a cloud of dust and gas
Down
- 2. explosion of a large star
- 3. clearly visible
- 4. all existing matter and space considered as a whole
- 7. cloud of gas and dust in outer space