Across
- 2. The smallest planet in our solar system
- 5. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
- 7. It is where stars, moons and planets are located
- 9. meaning international space station it is the biggest space organization in the world.
- 10. it is a build-up of gases leaving earth but entering space.
Down
- 1. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
- 3. Bright big balls that contain hydrogen and helium.
- 4. a region of space having a gravitational field so intense that no matter or radiation can escape.
- 6. interstellar gas is held together by gravity to hold planets, stars, and moons.
- 8. an object that can make distant things look bigger.