Chapter 21 Lesson 1-2 Crossword Puzzle

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Across
  1. 5. What is the biggest star called?
  2. 6. How long it takes to complete one rotation
  3. 7. The unit used to measure the distance in space
  4. 9. What are millions of small,rocky objects called?
  5. 10. The planets closest to the Sun are called what?
Down
  1. 1. What is a spherical object that orbits the sun?
  2. 2. When a planets atmosphere traps in energy and causes the temperature to rise
  3. 3. How long it takes to complete one revolution
  4. 4. Earth,Venus,Mercury,and Mars are classified as what?
  5. 8. What is made of gas,dust, and ice?