Across
- 3. system: the sun and other planetary bodies that orbits it
- 4. a system of billions or millions of stars together with gas and dust held by gravitational atraction
- 5. force: force that acts on an object without coming into contract with it.
- 6. the amount of mass of something
Down
- 1. an amount of space between two things or people
- 2. force that pulls objects together