Solar system assessment

3. the relationship that exists between the size, number, or amount of two things and that is often represented by two numbers
7. a science that deals with the history of a planet as recorded in rocks.
11. any state or process known through the senses rather than by intuition or reasoning.
12. a group of animals or plants that are similar and can produce young animals or plants.
15. of or relating to an orbit, that is, he curved path that something (such as a moon or satellite) follows as it goes around something else.
16. the science or occupation of farming.
18. the line at which the sky and Earth appear to meet.
19. the act or process of moving or turning around a central point
20. a device that is used to obtain information from outer space and send back to earth.
22. existing in or derived from nature; not made or caused by humankind.
24. having to do with the natural force that causes things to fall towards the earth.
25. a set of things working together as parts of a mechanism or an interconnecting network; a complex whole.

1. plural) any one of the very large groups of stars that make up the universe.
2. to look at (something) in a careful way to learn more about it
4. not in a state of sleep; completely conscious.
5. water falling in drops from vapor condensed in the atmosphere.
6. plural) a group of stars that forms a particular shape in the sky and has been given a name.
8. the entire range of wavelengths of electromagnetic radiation.
9. want something to happen or be the case
10. everything that exists anywhere.
13. the line at which the sky and Earth appear to meet.
14. a situation in which there is much destruction or confusion
17. a device that requires skill for proper use.
21. an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source.
23. facts or information used usually to calculate, analyze, or plan something.