As a comet gets closer to the sun, the sun's heat causes these elements to melt, spewing out dust and gas in a brilliant tail.
BrightSource generates electricity using an approach called concentrated solar power, in which computer-controlled mirrors, known as heliostats, focus the sun's heat to boil water and turn a steam turbine.
It is, first, an account of the many ways in which people have sought to produce energy by burning fossil fuels, harvesting the wind, brewing biodiesel and trapping the sun's heat.
While ice reflects around 80 percent of the sun's heat, having a cooling effect, blue sea water can absorb up to 95 percent of solar radiation, warming up the sea and accelerating the melting process further.
Then there is one of the oldest ways of getting power out from the sun: solar "thermal" installations, which absorb the sun's energy, transforming it into heat so it can boil water and run a turbine.
But I have to say the fact that "In the Heat of Sun" was not released in the U.S. market was a loss for the American audience, because I went to the San Francisco Film Festival with this film.
Among the challenges is modifying sensors designed to detect the heat from an incoming warhead so they can spot the much-cooler satellite, which has no heat source and is warmed only by the sun's rays.
CNN: Attempt to shoot down spy satellite to cost up to $60 million
Competition between the two is expected to heat up now that Oracle's purchase of Sun Microsystems has put it in the computer hardware business.
The sun also provides much of the heat for Gary Konkol's house in chilly Hudson, Wis.
The summer months see Times Square overrun by visitors all scrambling for their "I Heart NYC" t-shirt and matching sun visor, while the Empire State Building's elevator queue can, through the heat-haze, seem to extend as far, horizontally, as the iconic building stretches for the skies.
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