In Southwest Colorado, reflective surfaces along and above the horizon, like the mountain faces and the clouds that surround them, act like projection screens, Casey said. That environment makes for an \u201cextra spectacular sunset venue.\u201d<\/p>\n In the desert, sunsets often have deeper reds and oranges. That\u2019s because the lower horizon means there\u2019s more atmosphere to pull out blues and violets, said Dr. Michael Ottinger, dean of the School of Science, Math and Engineering at San Juan College<\/a>.<\/p>\n Other factors can affect the colors and intensity of a sunset, whether in the mountains or desert.<\/p>\n For example, moisture or pollution particles in the air can block a lot of the sunlight, dulling and diluting the colors, Casey said. Therefore, when the air is very dry, as it often is in the desert, there will be brighter sunsets.<\/p>\n Winter in particular can have spectacular sunsets because freezing weather pulls even more moisture out of the atmosphere, Ottinger said.<\/p>\n Clouds also affect sunset colors. In particular, when light hits low-lying clouds, sunsets may produce brighter oranges and yellows, Ottinger said.<\/p>\n Search Instagram for \u201calpenglow,\u201d and you\u2019ll likely see spectacular images of blaze-red mountaintops.<\/p>\n But according to Casey, there\u2019s some disagreement on what the phenomenon is. For some, the reddish glow occurs when direct sunlight illuminates mountains, while others say alpenglow occurs only after sunset, when light reflected off atmospheric elements turns mountaintops red.<\/p>\n Either way, we see the same effect for the same reason.<\/p>\n \u201cThe light on the mountains is rosy and warm because of the low angle of the sun in the sky and the long path sunlight must take through the atmosphere to reach them,\u201d Casey said.<\/p>\n While Durango is known for rosy, glowing mountains, in-town skygazers often miss out on the excitement.<\/p>\n \u201cWhen you\u2019re down in a low valley, the changes and hues have already happened, and you don\u2019t really get to see the full sunset and sunrise,\u201d Ottinger said.<\/p>\n