Exploring the Night Sky

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Across
  1. 5. Light rays travelling outwards (away from each other)
  2. 8. When light passes from one substance into another more dense substance it slows down and changes direction.
  3. 12. Objects that reflect (let light bounce off).
  4. 13. Highest electromagnetic radiation produced by the hottest and most energetic objects in the universe
  5. 15. Objects let some light pass through
  6. 17. Objects that give out (transmit) light.
  7. 18. The point where all light rays meet
  8. 20. A mirror the curves outwards
  9. 21. Low energy. They are extremely useful being used in heating food
  10. 22. Extremely high energy, they are well-known for their ability to see through skin and reveal images of the bones beneath it.
  11. 24. The starting light ray (before reflection or refraction)
  12. 26. A lens that has two caves
  13. 29. Receives light that the lens has focused and convert the light into neural signals.
  14. 30. The coloured part of the eye that controls the size of the pupil
  15. 32. What does the length of a year relate to for a planet
  16. 34. A lens that has two bulges
  17. 35. Very high energy. It can be extremely harmful to humans causing sunburn.
  18. 36. These planets are made of gas. They are far from the sun, so are the colder planets. They are called:
  19. 37. The first letter of each GAS GIANT planet in order
Down
  1. 1. Refers to the optical density of an object. It describes how fast light can travel through that medium.
  2. 2. What does the length of a day relate to for a planet
  3. 3. Absorbs some colours of white light and lets other colours through to create coloured light.
  4. 4. A mirror that is flat
  5. 6. The first letter of each ROCKY planet in order
  6. 7. Objects let almost all light pass through
  7. 9. Objects let no light pass through
  8. 10. Light is in a form of energy called electromagnetic radiation
  9. 11. A mirror that curves inwards
  10. 14. These planets are made of metal and rock. They are found close to the sun, so are the warmer planets. They are called:
  11. 16. Light rays travelling inwards towards a point
  12. 19. Carries messages to the brain.
  13. 23. Very low energy. They are extremely useful being used for things such as wifi, radio and televisions.
  14. 25. When the pupils get bigger
  15. 27. Focuses the light entering the eye.
  16. 28. The firs letter of each planet in order
  17. 31. Invisible to the human eye but can be felt as heat
  18. 33. Light enters here.