Solar system assessment

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Across
  1. 2. not in a state of sleep; completely conscious
  2. 5. any state or process known through the senses rather than by intuition or reasoning
  3. 7. to look at (something) in a careful way to learn more about it
  4. 8. a set of things working together as parts of a mechanism or an interconnecting network; a complex whole.
  5. 9. the line at which the sky and Earth appear to meet
  6. 10. a science that deals with the history of a planet as recorded in rocks
  7. 12. the entire range of wavelengths of electromagnetic radiation
  8. 15. a situation in which there is much destruction or confusion
  9. 16. existing in or derived from nature; not made or caused by humankind
  10. 19. plural) any one of the very large groups of stars that make up the universe
  11. 20. (plural) a group of stars that forms a particular shape in the sky and has been given a name
  12. 23. everything that exists anywhere
  13. 24. to change level, strength, or value frequently
  14. 25. water falling in drops from vapor condensed in the atmosphere
Down
  1. 1. the act or process of moving or turning around a central point
  2. 3. want something to happen or be the case
  3. 4. a device that requires skill for proper use
  4. 6. having to do with the natural force that causes things to fall towards the earth
  5. 11. a group of animals or plants that are similar and can produce young animals or plants
  6. 13. the relationship that exists between the size, number, or amount of two things and that is often represented by two numbers
  7. 14. facts or information used usually to calculate, analyze, or plan something
  8. 17. a device that is used to obtain information from outer space and send it back to Earth
  9. 18. 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
  10. 21. the science or occupation of farming
  11. 22. 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 (such as a planet)