Lightning expert Dr. Martin Uman explains that if a portion of the lightning spark is perpendicular to you, all points on that portion will produce sound that arrives almost simultaneously at your ears. The result is a high-intensity 'crash.' However, if much of the lightning channel is along your line of sight, sound arrival times vary, and the resulting thunder is a low-intensity rumble.
Okay, that's interesting. Now - why is lightning sometimes blue, and sometimes almost pink?
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