This image of Mars from the Curiosity rover is retouched so that the rocks appear the same colour as they would on Earth. This makes the sky much bluer than a real Martian sky ever is, and makes the planet seem much friendlier and more familiar. The image could be that of a rocky outcrop in a terrestrial desert. But it isn’t – it’s a mountain which is 360,000,000 kilometres away.
Thanks to the ever-fascinating Bad Astronomy for bringing this image to my attention.