These sand dunes in Yemen are part of Earth's largest expanse of desert, which covers much of southern Saudi Arabia as well. Data from two satellites were combined to produce this image's vivid colors: blue indicates the rocky composition of the land surface and contrasts sharply with the highly reflective sand dunes in yellow.
Here's a wonderful site that lets you view our planet Earth from space. Unlike Google Earth that lets you move through imagery of the planet, this site allows you to view our planet based on ecology and social topics.
(hat tip: ilachina)
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