In 'A Floating Chernobyl?,' Popular Science reports that two Russian companies plan to build the world's first floating nuclear power plant to deliver cheap electricity to northern territories. The construction should start next year for a deployment in 2010. The huge barge will be home for two 60-megawatt nuclear reactors which will work until 2050... if everything works fine. It looks like a frightening idea, don't you think? But read more for additional details and pictures of this floating nuclear power plant.
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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