Space and Earth

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Across
  1. 2. The time or date (twice each year) at which the sun crosses the celestial equator
  2. 6. A system of millions/billions of stars held together by a gravitational attraction.
  3. 10. Uses converging lenses to collect light
  4. 11. the solstice that marks the onset of summer, at the time of the longest day
  5. 14. the solstice that marks the onset of winter, at the time of the shortest day
  6. 19. A system of millions/billions of stars held together by a gravitational attraction.
  7. 20. The phenomenon of light or sound being deflected.
  8. 24. A telescope that uses a mirror that collects and focuses light.
  9. 25. Super violent. This kind of light can hurt your eyes
  10. 26. a space observatory launched on STS-93 by NASA on July 23, 1999.
  11. 27. a group of stars forming a recognizable pattern
  12. 30. A unit of astronomical distance equivilant to the amount that light travels in one year
  13. 31. The study of Earth and Space
Down
  1. 1. Orbital motion about a point
  2. 3. Science of the origin and development of the Universe
  3. 4. the equinox in spring, on about March 20
  4. 5. the equinox in autumn, on about September 22
  5. 7. a space observatory detecting light
  6. 8. A tube that magnifies your vision in order for you to see better.
  7. 9. The action of floating around an axis or center
  8. 12. The range or wavelengths or frequencies where electromagnetic radiation extends.
  9. 13. The curved path of a celestial object
  10. 15. The Galaxy in which the sun and our solar system is in.
  11. 16. A telescope launched into low Earth's orbit
  12. 17. either of the two times in the year summer or winter
  13. 18. Gathers and focuses light to create a magnified image.
  14. 21. the projection into space of the earth's equator
  15. 22. The point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.
  16. 23. A theory as to how the universe was created. The rapid expansion of matter and high temperature
  17. 28. The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
  18. 29. a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points