Unit 6 The Universe Vocabulary

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Across
  1. 1. 28.9 day cycle where the moon waxes on with the lit side growing until its full and then waneing off until its new (not seen) again.
  2. 2. a galaxy with no specific shape that is full of dust and gas resulting in a lot of new star formation
  3. 7. Systems of dust, gas, stars and interstellar matter
  4. 9. Ocean water that is pulled away from the shorelines where points on Earth that are not facing the moon at the moment
  5. 12. most masssive and luminous (biggest and brightest) stars found above the main sequence when stars begin fusion helium causing them to grow
  6. 16. chemical reaction where the nucleus of two atoms combine to form a new element
  7. 18. the hot, dense, dim core of matter left after a star dies
  8. 19. force that pulls matter together forming stars or holding moons and planets in orbit around stars
  9. 21. the brightness of a star determined by the amount of EM energy a star emits
  10. 23. the spiral-shaped galaxy in which the Sun and Earth's Solar System are located on a spiral arm about 3/4th away from the center
  11. 24. a tide just after the quarter moons (first or third) when there's the least difference between high and low water (lowest tidal range)
  12. 25. a division of the year that is characteriszed by recurring weather conditions and determined by both Earth's tilted axis relative to the sun in its position in orbit around the sun.
  13. 26. the rise and fall of sea levels that usually occur twice daily (2 high and 2 low per day) changing every 6 hours, caused by the moon's gravity
Down
  1. 1. the theory that all matter and energy in the universe was compressed into a single point that was extremely hot and dense causing it to explode and expand in all directions.
  2. 3. a galaxy shaped like a pinwheel, with a central nucleus and spiral arms extending outward
  3. 4. When a star or galaxy is moving away from the earth its spectral pattern shifts towards the longer wavelength side of the spectrum due to the doppler effect
  4. 5. a graph that shows the relationship between a star's luminosity, absolute magnitude, color and surfact temperature
  5. 6. a tide just after a new or full mood when there is the greatest difference between high and low water (highest tidal range)
  6. 8. as Earth rotates, water is pulled up onto the shore, bulging at parts of Earth that face directly toward or away from the moon.
  7. 10. the longest or shortest day of the year where the sun is shining more on ofe of earth's hemispheres
  8. 11. a spherical or elongated galaxy with a bright center and very little dust and gas
  9. 13. end stage of supermassive stars where a gigantic explosion throws matter out into space
  10. 14. category a star is classified into based on its surface temperature which is measured in Kelvin.
  11. 15. the motions of an object that orbits or travels around another object
  12. 17. a large cloud of dust and gas where stars are born
  13. 20. when the length of a day and a night are equal and the sun is shining equally on both the norther and southern hemisphere
  14. 22. the diagonal region on the H-R diagram where stars spend most of their lives fusing hydrogen