Believe it or not, around sunset and sunrise, the Martian sky is actually blue in the vicinity of the setting sun or rising sun. This amazing time-lapse video is comprised of several hundred pictures taken by a rover. Continue reading to see more.
Twilight lasts a long time after the Sun has set and before it rises, because of all the dust in Mars's atmosphere. At times, the Martian sky takes on a violet color, due to scattering of light by very small water ice particles in clouds. Generating accurate true-color images of Mars's surface is surprisingly complicated. There is much variation in the color of the sky as reproduced in published images; many of those images however are using filters to maximize the science value and are not trying to show true color.