Why Is The Sky Actually Blue? The Physics Of Light | Cosmic Earth

Added: 2026-05-16

[00:00:00]Ever look up and wonder why the sky is blue? Welcome back to Cosmic Earth.

[00:00:03]Today, we reveal the secret. Sunlight might look white to your eyes, but it is actually [music] a rainbow of colors.

[00:00:09]When light hits our atmosphere, it meets gas molecules. [music] This causes a phenomenon called Rayleigh scattering.

[00:00:15]Blue light travels in shorter, smaller waves. Because of this, it scatters much more than red light. The blue light spreads [music] in every direction. That is why the sky looks blue to us. At sunset, light travels through more atmosphere. The blue light scatters away completely, leaving only the red and orange waves behind. Did you learn something new today? Please like and subscribe for more space facts. [music] What should we explore next? Let us know below.