Y8 Universe

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Across
  1. 3. What happens to the orbital period when planets are further from the Sun.
  2. 7. A unit of distance equal to the distance that light travels in one year.
  3. 9. A cloud of dust an gas from which stars form.
  4. 10. The name give to a group of stars that make a pattern in the night sky.
  5. 11. The force that pulls gas and dust together when a star is formed.
  6. 13. The time taken for a planet to complete one orbit of the Sun.
Down
  1. 1. The name of the robotic probe launched in 1977 and is now furthest from Earth.
  2. 2. The largest planet in the Solar System.
  3. 4. The two times in a year when day and night are equal length.
  4. 5. The second furthest planet from the Sun.
  5. 6. Made up of many stars; ours is called the Milky Way.
  6. 8. A word that describes the four planets closest to the Sun.
  7. 12. What the planets and moons do to sunlight that allows us to see them.