Sand looks very different through a high-powered microscope. Photographer, biomedical researcher, and inventor Gary Greenberg started taking photos of sand grains with his own light microscope ...

Jewels of the sea: Microscopic images of sand reveal jaw-dropping beauty that is invisible to the naked eye. Images taken in Maldives, Mauritius, Sri Lanka, Seychelles and La Réunion ...

In another image, Mars' northern-most sand dunes are beginning to emerge from their winter cover of seasonal carbon dioxide ice. Dark, bare south-facing slopes are soaking up the warmth of the sun.