Frost-covered Dunes Mercury but some scientists show evidence

but some scientists show evidence that contradicts this theory

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

shown in blue

Look closely and you can see the moon protruding from the Earth's lower right

While there is much debate over which exoplanet discovery is considered the "first

Frost-covered Dunes Mercury but some scientists show evidenceDunes 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