Across
- 3. something that brings samples from other planets
- 6. consisting of a luminous spheroid of plasma held together by its own gravity
- 8. science of the origin and development of the universe
- 10. air, is the layer of gases retained by earth's gravity that surrounds the planet
- 11. unit of length used to express astronomical distances
- 12. the hottest planet
- 14. something that goes around something
Down
- 1. the biggest and most needed planet
- 2. gravataional boud system
- 4. a planet outside the solar sytsem
- 5. a natural science that studies celestial objects and phenomena
- 7. the measerment between something
- 9. something that is used to look at space
- 10. someone who studdies astronomy
- 13. the farthest planet from earth