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Grade 9 · Astronomy & space

Grade 9 Astronomy & space practice

20 questions on solar system, astronomical light, space science. The answer key is a separate download.

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What is on the worksheet

  1. Explain why counting only planets does not describe all solar-system matter.

  2. A model blackbody has temperature 7200 K. Use Wien constant 2.898×10⁶ nm K to find its wavelength-spectrum peak. Round the final result to 4 decimal places if needed. Answer in nm.

  3. A probe is 5500000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  4. A probe is 34700000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  5. A probe is 43200000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  6. A model blackbody has temperature 6600 K. Use Wien constant 2.898×10⁶ nm K to find its wavelength-spectrum peak. Round the final result to 4 decimal places if needed. Answer in nm.

  7. A probe is 46800000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  8. A probe is 16400000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  9. A probe is 9700000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  10. A probe is 40600000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  11. A probe is 1800000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  12. A probe is 2400000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  13. A model blackbody has temperature 12600 K. Use Wien constant 2.898×10⁶ nm K to find its wavelength-spectrum peak. Round the final result to 4 decimal places if needed. Answer in nm.

  14. A probe is 20500000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  15. A probe is 14500000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  16. A model blackbody has temperature 4500 K. Use Wien constant 2.898×10⁶ nm K to find its wavelength-spectrum peak. Round the final result to 4 decimal places if needed. Answer in nm.

  17. Using c=3×10^8 m/s and wavelength 3 m, find frequency in MHz.

  18. A model blackbody has temperature 14300 K. Use Wien constant 2.898×10⁶ nm K to find its wavelength-spectrum peak. Round the final result to 4 decimal places if needed. Answer in nm.

  19. A probe is 46000000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  20. A probe is 17400000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

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