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- 25 PUZZLER: Around how many solar system bodies are there Legos in orbit?
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- 11 Does the ISS have zenith-facing windows?
- 8 Why are some rockets orange?
- 8 Does the Hubble telescope use a "simple" PID-controller for its pointing control system?
- 6 What determines if a star tracker blends two stars that are close to each other?
- 6 What is the frame of reference for orbital speed?
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