Unit 2-3-4 (Space)

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Across
  1. 2. the central part of the sun where nuclear fusion occurs
  2. 4. the visible surface of the sun
  3. 7. The tide with the greatest difference between consecutive low and high tides, when the sun and moon are parallel
  4. 8. to spin on an axis
  5. 10. a star and all of the planets and other objects that revolve around it
  6. 18. Either of the two times of the year when the sun is at the celestial equator and both hemisphere receive equal days; about March 21 and September 21
  7. 19. the tide with the least difference between consecutive low and high tides, when the sun and moon pull at right angles
  8. 20. Moon phase at which the Moon cannot be seen because its lighted half is facing away from Earth.
  9. 25. Small rocky planets with no rings and few moons (Mercury, Venus, Earth, Mars)
  10. 26. a dark area of the photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field
  11. 29. a sudden eruption of intense high-energy radiation from the sun's surface
  12. 31. to move in a circular path around another object
  13. 34. Large gas giant planets with many moons and rings (Jupiter, Saturn, Uranus, Neptune)
  14. 35. the layer of the sun's interior where energy is transferred outward from the core
  15. 36. A space rock that passes through the atmosphere and hits Earth's surface.
  16. 37. a large body in space that orbits a star and does not produce light of its own
  17. 38. a galaxy with no defined, recognizable shape; contains mostly young stars
  18. 39. color of the hottest/highest-temperature stars
  19. 40. a loop of gas that protrudes from the sun's surface, linking sunspot regions
  20. 41. the distance light travels in one year; used as a unit of measurement of the distance between stars
  21. 42. how bright a star actually is as measured from a fixed distance
Down
  1. 1. Either of the two times of the year when the sun is at its greatest distance from the celestial equator and one hemisphere receives its shortest days; about June 21 and December 21
  2. 3. the outer layer of the sun's atmosphere.
  3. 5. a graph organizing stars by their temperature and brightness
  4. 6. space and all the matter and energy in it
  5. 9. the continuous flow of charged particles from the sun
  6. 11. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms
  7. 12. a galaxy shaped like a round or flattened ball, generally containing only old stars
  8. 13. a diagonal area on an H-R diagram that includes more than 90 percent of all stars
  9. 14. a collection of stars, dust, and gas bound together by gravity
  10. 15. A streak of light in the sky produced by the burning of a space rock in Earth's atmosphere.
  11. 16. color of the coolest/lowest-temperature stars
  12. 17. layer of the sun where hot gas moves up toward the surface and cooler gas moves deeper into the interior
  13. 21. A 2-D region of the solar system that is just beyond the orbit of Neptune and that contains many small bodies
  14. 22. Moon phase when the entire side facing Earth is illuminated.
  15. 23. Unit the average distance between the Earth and the Sun; used as a unit of measurement inside the Solar System
  16. 24. how bright as star appears as seen from Earth
  17. 27. A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion
  18. 28. term pertaining to the period during which the visible surface of the moon decreases
  19. 30. a 3-D spherical region that surrounds the solar system and contains billions of comets
  20. 32. A ball of frozen dust and rock that orbits the sun and has a tail that glows
  21. 33. term pertaining to the period during which the visible surface of the moon increases