Frost-covered Dunes Mercury The orange filaments are the

The orange filaments are the tattered remains of the star and consist mostly of hydrogen

An amazing image from NASA's Spitzer and Hubble Space Telescopes looks more like an abstract painting than a cosmic snapshot

infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on April 24

the azure blue in the northern Saturnian hemisphere that greeted Cassini upon its arrival in 2004 is now fading

Frost-covered Dunes Mercury The orange filaments are theDunes are often found on crater floors. In the winter, at high northern latitudes, the terrain is covered by carbon dioxide ice (dry ice). In the spring, as this seasonal ice sublimes, many unusual features unique to Mars are visible. On the floor of this crater where there are no dunes, the ice forms an uninterrupted layer. On the dunes, however, dark streaks form as surface material from below the ice is mobilized and deposited on top of the ice. In