Scientists reveal secrets of Earth’s magnificent desert star dunes

WASHINGTON: They are among the wonders of our deserts: star dunes, the vaguely pyramid-shaped sand formations up to about 1,000 feet (300 meters) tall with arms stretching out from a central peak to give them a star-like appearance when viewed from above.
Scientists on Monday unveiled the first in-depth study of a star dune, revealing the internal structure of these geological features and showing how long it took for one of them to form — more quickly than expected but still a process unfolding over many centuries.

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