Space Exploration

5. Very important or basic; forming the foundation of something.
7. Evidence or facts that show something is true.
8. Tiny, dry particles of matter that float in the air or settle on surfaces.
10. An object that moves around a planet; it can be natural (like the Moon) or artificial .
14. The layer of gases that surrounds a planet.
15. To discover or notice something, especially something that is not easy to see or hear.

1. The visible features of an area of land, including hills, valleys, trees, and buildings.
2. Large, flat areas of land with few trees.
3. A low area of land between hills or mountains, often with a river running through it.
4. Tools or devices used for a particular purpose, especially for scientific or musical work.
6. to feel curious or to ask yourself questions about something; to think about something with amazement or doubt.
9. A unit for measuring temperature or angles; it can also mean the level or extent of something.
11. Different parts, features, or sides of something.
12. to To cause something to happen; to result in something.
13. Extremely large in size, area, or amount.