Across
- 2. Earth's only natural satellite, a rocky sphere that orbits the Earth
- 6. a three-dimensional expanse, an area, or a period of time.
- 7. a person who travels in space as part of a crew or as a commander on a spacecraft
Down
- 1. everything that exists, including space, time, matter, and energy
- 3. the universe, but it usually refers to a universe that is orderly and harmonious
- 4. a massive collection of stars, gas, dust, and dark matter held together by gravity
- 5. a large celestial body that orbits a star and has enough gravity to be spherical