Measuring Light

Clouds Clearing

U.S. Geological Survey · 1024×680

The very first light

Nicolas Valentin · 1024×768

Metal desk lamp and books pile

freestocks.org · 683×1024

Seaside shadows

Henry Ash · 1024×684

Arctic, bsee, bureau

bseegov · 1024×683

Brink of the Lower Falls after a snow storm (2)

YellowstoneNPS · 1024×683

Brink of the Lower Falls after a snow storm panorama

YellowstoneNPS · 1024×359

Stars Over the Ocean

athrasher · 1024×682

Middle Fork of the Flathead River

GlacierNPS · 1024×681

Middle Fork of the Flathead River

GlacierNPS · 1024×681

U.S.-Mexico Regulators Workshop Convened in D.C.

bseegov · 1024×718

Measuring the Workspace

NASA/JPL-Caltech/IPGP · 1280×853