Actual high resolution free Nasa photo of Mars, I took the planet, added bluish tones to the shadows and greenish tones to the higher elevation areas. You can actually see what it looked like back then. Added stars with bluish tone and vertical fade to black, as it made the colors stand out more.
Wallpaper is 1920x1080
PSe-7 used through Wine
..Click "Download" to view in full resolution.