Children play with snow in the middle of the traffic roundabout at Columbus Circle in New York City.

A woman walks in a park during a heavy snowfall in the center of Sofia, Bulgaria.

A deer pauses in Knole Park, Sevenoaks, Kent, England.

Snow covers the a decorated tree in front of the West Wing of the White House in Washington.

A boy slides down a hill on a plastic disk in New York's Central Park.

Linfen, China

Yamuna River, India

Lake Karachay, Russia

Dzerzhinsk, Russia

The North Pacific Gyre

Uluru

Sunset

Road Train

Red Earth

Aboriginal Rock Art

Navigating by Starlight

Zambia—A lone bull elephant breakfasts at first light near the precipice of Victoria Falls. With the Zambezi River near its seasonal ebb, once submerged walkways—and fresh foraging possibilities—present themselves.

Madagascar—Sunrise reveals light traffic—a lone oxcart—along the Avenue of the Baobabs. The 80-foot-tall "upside-down trees

United Arab Emirates—Peninsulas of prosperity, the "fronds

United States—The shuttle Endeavour—deft in orbit but incapable of terrestrial flight—catches a post-mission piggyback on a 747, soaring over California's Mojave Desert en route to Florida's Kennedy Space Center.

United States—Limned by Hurricane Ike, an abstract expressionist expanse of oil-sheened floodwater surrounds a pump jack—a mechanical device used to extract oil—near High Island, Texas.