NASA's Curiosity rover taking a picture of itself on Mars. (Photo/NASA/JPL) At the surface, Mars is a desolate, barren world with a rocky landscape, massive dust storms and extreme temperature swings.

It took just 1 hour and 40 minutes for the moon's shadow to race more than 4,000 miles (6,500 kilometers) across the ...

Thanks to the Earth's 23.5 degree tilted axis, the length of twilight also varies with the seasons. Noctilucent clouds, often visible during Nautical twilight Colour and light begin to drain away ...

Curiosity, which was built by NASA's Jet Propulsion Laboratory and managed by Caltech in Pasadena, California, on February 2 captured the scene during the rover's newest twilight cloud survey ...