Sunsets on Mars Are Blue

At sunset on Mars, the sky near the Sun turns blue.

Fine Martian dust scatters red light away from the direct line to the Sun, so blue light gets through near the horizon at dusk. It is close to the reverse of what happens on Earth, where our air scatters blue and leaves red sunsets.

Check it yourself

NASA has published real sunset images from its Mars rovers. Search for Curiosity or Spirit Mars sunset.