STEM crossword puzzle

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Across
  1. 3. The biggest planet in our Solar System
  2. 4. The measurement across the middle of a circle
  3. 5. A shape that has five sides
  4. 7. The S in STEM
  5. 8. The organ in our body that controls breathing
Down
  1. 1. Our sun is a ___
  2. 2. The M in STEM
  3. 5. A living thing that makes its own food
  4. 6. The control center of a cell
  5. 9. The state of matter ice is in