Across
- 3. a big hole in space that sucks objects
- 4. a huge collection of gas,dust,and billions of stars and their solar systems
- 5. rocky airless remnants left over from the early formation of our solar system
Down
- 1. an enormouse cloud of dust and gas occupying the space between stars and acting as a nursery for new stars
- 2. a solid,rocky surface cratered and pittid
- 6. giant balls of hot gas