PhysicsGeneralQuality 65 · Exceptional
Why the Sky Is Blue
PR
Cleo BellTeacher Tier
@author · 2026-08-27 · v1
7 min read
Sunlight contains all colors. Air molecules scatter shorter wavelengths (blue) more than longer ones (red) — a process called Rayleigh scattering. So blue light bounces around the atmosphere and reaches our eyes from all directions, making the sky appear blue. At sunset, light passes through more atmosphere, leaving mostly red.
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Yuki S.
16 days agoQuick question: does this hold for the advanced case too?
Yuki S. Teacher
16 days agoYes, it generalizes, though the advanced case needs more care.
Aiden K.
16 days agoThis is the kind of contribution CampusWorld needs more of.
Marcus B.
16 days agoGreat breakdown. I'd been fuzzy on this exact point for weeks.