Reading Explorers Space Review

2. to look somewhere carefully in order to find something
6. not influenced or controlled in any way by other people, events, or things
9. to go or move something forward, or to develop or improve something
10. communication with someone, especially by speaking or writing to them regularly
11. to give permission for someone to do something, or to not prevent something from happening
12. the science of treating and preventing illness
14. to recognize someone or something and say or prove who or what that person or thing is
15. a continuous curved line, the points of which are always the same distance away from a fixed central point

1. the outer or top part or layer of something
3. to be, or to be real
4. a helpful or good effect, or something intended to help
5. the amount of space between two places
7. a piece of equipment that you use with your hands to make or repair something
8. able to control or influence people or things that happen, or very strong
13. an important job, especially a military one, that someone is sent somewhere to do
15. a feeling of worry about something, or something that involves or affects you