Photo of the Day

Penguins swimming underwater
December 21, 2009

Penguins Under Water, Antarctica

This Month in Photo of the Day: Most Popular Photos From 2009 Penguins surface near an air hole in Antarctica, captured with a remote underwater camera. From the National Geographic book Visions of Paradise, 2008
Photograph by Maria Stenzel

Go Further

Subscriber Exclusive Content

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history