Largest Solar Park in the World Opens in Germany

The ribbon was cut on the World's largest continguous solar plant on 27th April 2006 in Germany. Construction on the 40 million euro (US$48 million) photovoltaic installation started August 2005. This plant demonstrates new standards in cost-efficiency for solar power. Using the master-slave inverter concept developed by Shell, the plant delivers the optimized energy output. Also, flexible installation technology--such as the use of either aluminum, wood or steel racks depending on material prices and the foundation on either concrete or piles--optimizes the costs. And if solar is viable in Germany, just imagine the efficiencies possible where the sun really shines!

Pocking receives an average of 1121 KWh/m2-year. 62,500 modules in 6 parallel linked units deliver power from earth's closest star to the houses of 3300 Germans via energy company E.on. That's a total of about 16,5 km (10 miles) of solar panels mounted on a former military grounds at Pocking, near Passau in Bavaria. The installation saves 10,000 tons of CO2 yearly--the equivalent of 1,000 hectares of woodlands. [solar magazin]

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US says world safer, despite 11,000 attacks in '05

The U.S. war on terrorism has made the world safer, the State Department's counterterrorism chief said on Friday, despite more than 11,000 terrorist attacks worldwide last year that killed 14,600 people. The U.S. State Department said the numbers, listed in its annual Country Reports on Terrorism released on Friday, were based on a broader definition of terrorism and could not be compared to the 3,129 international attacks listed the previous year. But the new 2005 figures, which showed attacks in Iraq jumped and accounted for about a third of the world's total, may fuel criticism of the Bush administration's assertion that it is winning the fight against terrorism. Asked if the world was safer than the previous year, U.S. State Department Counterterrorism Coordinator Henry Crumpton told a news conference, "I think so. But I think that (if) you look at the ups and downs of this battle, it's going to take us a long time to win this. You can't measure this month ...

Al-Qaeda number two in new video

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Does light have mass?

The short answer is "no", but it is a qualified "no" because there are odd ways of interpreting the question which could justify the answer "yes". Light is composed of photons so we could ask if the photon has mass. The answer is then definitely "no": The photon is a massless particle. According to theory it has energy and momentum but no mass and this is confirmed by experiment to within strict limits. Even before it was known that light is composed of photons it was known that light carries momentum and will exert a pressure on a surface. This is not evidence that it has mass since momentum can exist without mass. [ For details see the Physics FAQ article What is the mass of the photon? ]. Sometimes people like to say that the photon does have mass because a photon has energy E = hf where h is Planck's constant and f is the frequency of the photon. Energy, they say, is equivalent to mass according to Einstein's famous formula E = m...

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