As the sun sank beyond the horizon on Mars on April 15, NASA's Curiosity rover snapped a shot of this stunning blue sunset.
The image was captured on the rover's Mast Camera, in between dust storms, NASA reported.
"The colors come from the fact that the very fine dust is the right size so that blue light penetrates the atmosphere slightly more efficiently," said Mark Lemmon, the Curiosity science-team member who planned the observations.
"When the blue light scatters off the dust, it stays closer to the direction of the sun than light of other colors does. The rest of the sky is yellow to orange, as yellow and red light scatter all over the sky instead of being absorbed or staying close to the sun."
The rover is located in Mars' Gale Crater and has been studying the planet's environment since August of 2012.