✨ What was the first specific element identified by Professor Gazen using the spectroscope on the mysterious Martian light?
Difficulty: Easy
⏳ How long did each distinct spectrum from the Martian light typically last before changing to another?
Difficulty: Medium
💡 According to the narrator's proposed idea, how could the Martians use the changing spectra of chemical elements to communicate complex ideas, beyond merely attracting attention?
Difficulty: Hard
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