NASA’s November 1 Astronomy Picture of the Day collects apparent Moon colors recorded by photographer Marcella Giulia Pace over ten years. A Moon low on the horizon often appears red or yellow because the long atmospheric path scatters blue light. More unusual blue or purple tones can involve different dust conditions and complex effects.
This is a fun photography challenge: when the Moon next appears near the horizon, capture it with a fixed exposure and white balance, then compare that with a higher-altitude view on another night. Keeping camera settings consistent makes the atmospheric change easier to see.
The NASA page shows the original montage and credits, so this is a visual story best experienced at its source rather than reduced to a headline.
Go to Source — Primary: https://science.nasa.gov/image-article/apod-2026-november-1-colors-of-the-moon/