It may be known as the red planet, but sunsets on Mars are blue.
Nasa has released a new video on the social media site Vine showing the sun dipping towards the Martian horizon, captured by its exploratory rover Opportunity.
The time-lapse video of the eerie sunset was created by piecing together images taken by Opportunity.
And rather than turning the sky a deep orange, as happens on Earth, the setting sun gives the sky a deep blue tinge.
Although much of the surface of Mars is a deep red colour, it is this thick dust that also turns the sunset blue.
However, Dr John Bridges, a planetary scientist at the University of Leicester who studies Mars, warned that the cameras on the Opportunity rover may not be conveying the true image.
He said: 'We do have to be a little careful with the colour produced by the cameras on this rover as they are a false colour image.
'What is very striking though is how much smaller the sun appears compared to here on Earth.
'Taking images like this can teach us a great deal about the atmosphere on Mars.
'Most of the dust is in the troposphere, which is about 40km up on Mars.
'There is a lot of effort to find out how high up dust clouds can get up on Mars - particularly after some cloud-like plumes were spotted that appear to be much higher in the atmosphere than we thought dust can go.