UA on Instagram: "🌈 Neil deGrasse Tyson explains Rayleigh scattering — the simple physics behind why the sky is blue and sunsets are red. Sunlight looks white, but it’s actually made of all colors. When that light enters Earth’s atmosphere, it collides with tiny gas molecules. Here’s the trick: Shorter wavelengths of light — blue and violet — scatter much more than longer ones like red. Blue light gets scattered in every direction, filling the sky above you. So when you look up during the day,