Vocab

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Across
  1. 3. a region of cosmic gas and dust formed from the cast off outer layers of a dying star
  2. 7. leftover energy from the Big Bang
  3. 10. tide with the largest daily tidal range, which occurs when the Sun, Earth, and Moon line up with each other
  4. 12. the rise and fall of sea levels caused by the gravitational attraction of the Moon and the Sun
  5. 13. what stars like the sun become after they have exhausted their nuclear fuel
  6. 17. huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores
  7. 20. when the tide is at its lowest elevation
  8. 21. tide with the smallest daily tidal range; occurs when the Sun, Earth, and the Moon form a 90-degree angle
  9. 22. the Sun together with the group of celestial bodies that are held by its attraction and revolve around it
  10. 24. a galaxy exhibiting a central nucleus from which extend curved arms of higher luminosity
  11. 25. the four natural divisions of the year based on changes in temperature due to the varying amounts of sunlight received caused by the tilt of Earth during its revolution
  12. 26. large cloud of gas and dust that contracts under gravitational force and breaks apart into smaller pieces, each of which will collapse to form a star
  13. 27. graph in which the absolute magnitude of stars are plotted against their temperatures
  14. 30. when the left half of the Moon is illuminated and the lunar cycle is in the waning phase
  15. 33. the movement of one object around a center or another object
  16. 34. a young star forming from a collapsing region within a molecular cloud
  17. 35. distance light travels in a year
  18. 37. states that about 12 billion to 15 billion years ago, the universe began with a huge, fiery explosion
  19. 39. a band of stars on a Hertzsprung-Russell (HR) diagram that represents the stages a star goes through during most of its life
  20. 40. a star with a large radius for its mass and temperature, resulting in high brightness
Down
  1. 1. a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity
  2. 2. the lunar phase when the Moon is between the Sun and the Earth and none of the illuminated portion is seen from Earth
  3. 4. an area of such immense gravity that nothing, not even light, can escape from it
  4. 5. a galaxy with no identifiable shape or structure, mostly made of young stars.
  5. 6. when the tide is at its greatest elevation
  6. 8. the slant of Earth’s axis
  7. 9. all of space and everything in it including stars, planets, and galaxies
  8. 11. an invisible form of matter that does not emit any detectable electromagnetic energy of its own
  9. 14. an attractive force that exists between all objects that have mass
  10. 15. the lunar phase when Earth is between the Sun and Moon and all of the illuminated portion is seen from Earth
  11. 16. the imaginary line through Earth that extends from the North Pole to the South Pole and is the center of Earth’s rotation
  12. 18. when the right half of the Moon is illuminated and the lunar cycle is in the waxing phase
  13. 19. an invisible form of energy that creates a repulsive force causing the universe to expand
  14. 22. the two days of the year when the noon sun reaches its highest or lowest point in the sky
  15. 23. the spiral galaxy of which in the Sun and the solar system are a part.
  16. 28. an enormous explosion that destroys a star
  17. 29. day and night are the same length because neither hemisphere is tilted toward the sun
  18. 31. an oval shaped galaxy, made of old stars and does not have much gas or dust
  19. 32. the shift to a different wavelength
  20. 36. a curved path followed by a satellite as it revolves around an object
  21. 38. the path an object follows as it moves around another object