Science Source Feb 2010

Moon over Mount Sneffels Range, part of the San Juan Mountains, in Colorado.

Sunset.

Snowstorm from Ryan Mountain over the Mojave Desert, in the Joshua Tree National Park, CA.

Lightning, (multiple cloud ground strikes) over Tucson, Arizona.

Moonlit Road.

Crepuscular rays shine from behind cumulus congestus clouds.

A tornado wrecked this house in Cleveland, Georgia.

Morning mist in western Pennsylvania.

Full Moon over Mt. Adams and oak tree; photographed from Sauvie Island, Oregon.

Altostratus clouds at sunrise over Cuyamaca Lake, California.

Sunrise at Jordan Lake, near Raleigh, North Carolina.

Moonrise over glacier-carved ridge line, in the Alaska Range in early summer, with late evening light. Near Polychrome Pass, in the Denali National Pa...

Moonrise over glacier-carved ridge line, in the Alaska Range in early summer, with late evening light. Near Polychrome Pass, in the Denali National Pa...

Sunrise over the Baker Wetlands, near Lawrence, Kansas.

A cumulus cloud over the Bahamas.

Light rays burst through the clouds at sunset.

A moderate cumulus cloud with cirrus clouds in the eastern sky is impressively lit by the setting sun.

Cumulus clouds are a type of cloud with noticeable vertical development and clearly defined edges.

The Sun rises over Horseshoe Lake in Lathrop State Park, Colorado.

Lightning, (multiple cloud ground strikes) over Tucson, Arizona.

Lightning, (multiple cloud ground strikes) over Tucson, Arizona.

Lightning, (multiple cloud ground strikes) over Tucson, Arizona.

Sunset over Bottenintnin Lake, Kenai Moose Range, Alaska.

Hurricane damage at Atchafalaya Basin Swamp, in Louisiana.

A home, ruined by a blizzard in 1993, in Fire Island, NY.

Death Valley National Park, California. Cinders cover the ground for about 2-5 miles in every direction from Ubehebe Crater.

Sunset over the Olympic Mountains in Edmonds, Washington.

Hurricane Belle threw this boat through a stone wall onto the shore of Bell Island Beach, in South Norwalk, Conn.

Clouds.

Cirrus clouds.

Ice-capped cumulus clouds.

Computer representation of the activation of a multipolar neuron of the cerebellum, known as a Purkinje cell. A Purkinje cell is composed of a flask-s...

Sickle cell anaemia is an inherited blood disease in which the red blood cells contain abnormal haemoglobin, the oxygen-carrying pigment. During deoxy...

AIDS virus, transmission electron micrograph (TEM). AIDS virus particles budding from the surface of a T4 lymphocyte cell. AIDS (acquired immune defic...

Volvox algae releasing daughter cells.

Color-enhanced SEM of sickle cell anemia.

Hexagonal snow crystal with broad branches, composed of 2 offset 3-branched snow crystals. Image was obtained using a Low Temperature Scanning Electro...

Hexagonal snow crystal with broad branches, composed of 2 offset 3-branched snow crystals. Image was obtained using a Low Temperature Scanning Electro...

Volvox (Volvox sp.) is found in ponds and ditches. Up to 1000 single-celled green algae, each one with a tiny pair of whip-like tails, are linked toge...

Hexagonal snow crystal with broad branches, composed of 2 offset 3-branched snow crystals. Image was obtained using a Low Temperature Scanning Electro...

Hexagonal snow crystal with broad branches, composed of 2 offset 3-branched snow crystals. Image was obtained using a Low Temperature Scanning Electro...

Hexagonal snow crystal with broad branches, composed of 2 offset 3-branched snow crystals. Image was obtained using a Low Temperature Scanning Electro...

Macrophotograph of a snowflake showing characteristic hexagonal symmetry. Each crystal is made up of water molecules, arranged with 2 hydrogen atoms m...

Hexagonal snow crystal with broad branches, composed of 2 offset 3-branched snow crystals. Image was obtained using a Low Temperature Scanning Electro...

Macrophotograph of a snowflake showing characteristic hexagonal symmetry. Each crystal is made up of water molecules, arranged with 2 hydrogen atoms m...

Macrophotograph of a snowflake showing characteristic hexagonal symmetry. Each crystal is made up of water molecules, arranged with 2 hydrogen atoms m...

Macrophotograph of a snowflake showing characteristic hexagonal symmetry. Each crystal is made up of water molecules, arranged with 2 hydrogen atoms m...

Typical hexagonal snowflake. Image was obtained using a Low Temperature Scanning Electron Microscope (LT-SEM). Colorized version of BK3578.

Typical hexagonal snowflake. Image was obtained using a Low Temperature Scanning Electron Microscope (LT-SEM). Colorized version of BK3578.

Typical hexagonal snowflake. Image was obtained using a Low Temperature Scanning Electron Microscope (LT-SEM). Colorized version of BK3578.