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usagov:Image description: This photograph of the U.S. Capitol...

usagov: Image description: This is an animation of the Aurora Australis (Southern Lights), eight day

usagov: Image description: This graphic shows a wobbly polar vortex configuration in comparison to a

usagov: Image description: On the left, bright green auroras appear to emanate from the largest glac

usagov: Image Description: When the air is cold at Waubay National Wildlife Refuge but the lake isn&

usagov: Image description: NASA’s Spitzer Space Telescope revealed an object that looks like a