Space

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Across
  1. 2. objects natural object which is located outside Earth's atmosphere
  2. 4. An American astronomer instrumental in development of contemporary stellar constellation
  3. 5. measure of the level of ionizing radiation present in the environment at a particular location
  4. 6. anything that occupies space and has mass
  5. 7. an increase or decrease in the frequency of sound,light,or other waves
  6. 9. nature of something's ingredients or constituents
  7. 12. displacement of spectrallines towards longer wavelengths
  8. 13. atomic number greater than 92
  9. 14. an optical instrument used to observe distant objects
  10. 15. something that is accepted as true without proof
  11. 16. origin and development of the universe
  12. 17. proved objects were actually galaxies
  13. 22. contains our solar system
  14. 23. theory an explanation of an aspect of the natural world that can be repeatedly tested and verified
  15. 26. force by which a planet or other body draws objects towards its center
  16. 27. first person to walk on the moon
Down
  1. 1. two or more atomic nuclei formed
  2. 3. Danish chemist and astronomer
  3. 8. instrument used to measure properties of light over a specific portion of the elctromagnetic spectrum
  4. 10. cosmological model of the observable universe
  5. 11. spherical region of universe comprising all matter observed from Earth
  6. 18. theory of exponential expansion of space in the early universe
  7. 19. used to distinguish the physical matter of the universe
  8. 20. where all the stars and everything are
  9. 21. self-contradictory statement or proposition that when investigated or explained may prove to be well founded or true
  10. 23. large group of smaller galaxy clusters
  11. 24. lowest temperature
  12. 25. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction