August 24, 2011
Behind this darker cloud, is a pileus iridescent cloud, a group of water droplets that have a uniformly similar size and so together diffract different colors of sunlight by different amounts. The above image was taken just after the picturesque sight was noticed by chance by a photographer in Ethiopia. Photographer Esther Havens
July 25, 2011
Since the 1970s, chemists have worked on storing solar energy in molecules that change state in response to light. These photoactive molecules could be the ideal solar fuel, as the right material should be transportable, affordable, and rechargeable. Unfortunately, scientists haven’t had much success. By Yun Xie, Ars Technica
July 8, 2011
The American flag flaps in the breeze against the backdrop of a halo around the sun at the US track and field championships in Eugene, Oregon. These rings are caused by cirrus clouds and moisture as high as 30,000 feet where the temperatures are well below freezing. The moisture turns into ice crystals, and the sunlight then reflects off these ice crystals creating a halo or ring. Photograph Don Ryan
June 22, 2011
The 531 foot-tall PS20 tower, located near Seville in Spain is the world’s most powerful solar power tower. Is capable of generating 20 mega-watts of energy by using 1,255 mirrors to harness the raw power sunlight.
May 29, 2011
The photo above showing irisation (iridescence) in cumulus clouds was taken over the sharp summits of Gran Paradiso National Park, Italy. Photographer: Piero Armando
May 17, 2011
The sequence above shows the setting Sun dipping toward the western horizon as observed from Veszprem, Hungary. As the Sun sinks lower, its color becomes more reddened because the path length of sunlight is increasing.
April 8, 2011
The photo above showing an eye-catching 22-degree halo and upper tangent arc was captured just before sunset over Dayton, Ohio on January 21, 2011.
March 31, 2011
One of the rarest of Earth’s astronomical events is a ghostly glow called the zodiacal light that the ancient Greeks believed that it was caused by distant volcanic eruptions.
March 28, 2011
The photo above shows the scenic Blackstone Glacier emptying into Blackstone Bay in southeastern Alaska. Blackstone Glacier is one of a number of tidewater glaciers in the College Fjord area of Prince William Sound. Photographer: Nel Graham
March 18, 2011
At an electric plant in southern Spain, mirrors as big as houses catch some of the 120 quadrillion watts of sunlight that constantly fall on Earth. Government subsidies for this pricey yet promising power source have made Europe the world’s solar capital. Photograph Michael Melford