Physics Photo of the Week February 06, 2026 Shadows on Groundhog Day - Photos by Donald Collins The weather was was perfect for Groundhog Day last Monday! Fresh snow had fallen on the weekend, and the Sun was shining with a clear blue sky. When the groundhog supposedly came out to check on the weather he didn't see his own shadow, but the strange shadow featured in the picture above. That really scared him so he scurried back into his hole and will be there hibernating for another six weeks - about the time until the spring equinox. The groundhog was also spooked by the color of the shadow. Looking at the color swatches at right, which one (A, B, or C) matches the color of the shadows cast on the white snow on the bright sunny day with the clear blue sky? If you picked "C" you are correct. The sunlit parts of the snow receive the direct rays of the Sun. The Sun emits virtually al...