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South Korea builds a 20-mile, solar-powered bike line down the middle of a highway.

By crossing airships with airplanes, Solar Ship is creating craft that can carry heavy loads long distances with a tiny carbon footprint. Filled with helium, they soak up rays from the sun to provide the energy for forward motion and fulfill its original design challenge – carry 1,000 kilograms (2,205 lbs) of payload 1,000 kilometers (621.4 miles).

When Ford's re-tooled Michigan Assembly Plant in Wayne starts building the Focus Electric next year, a chunk of the electrical energy used in the plant will be provided by one of the largest solar arrays in Michigan. Detroit Edison, Xtreme Power and the state of Michigan are partnering with Ford to install a 500-kilowatt solar array along with a 750-kilowatt battery system with 2 megawatt-hours of capacity. The solar power system will be used to power production of the Focus and Focus Electric a

Click above to watch the video after the break

What if you took the solar panel idea and applied it on a scale of epic proportions? Just imagine wrapping the entire 6,800-mile circumference of the moon with solar panels to harness the sun's power and then beamed all that collected energy back to Earth via microwave or laser technology to power the world. Sounds far-fetched, doesn't it? Sure, but the Shimizu Corporation, a Japanese construction firm, still hopes to one day make this dreamy idea a reality.

There's no doubt that solar energy is one of the greenest sources of electricity and the idea of using it to power transportation is not new. We've seen solar-powered boats and solar-powered cars before, among other things, but we didn't know until now that a solar-powered high-speed train was on anyone's drawing board. Apparently, it is.

Why no solar powered electric cars?

Lest you think that it's easy to make a competitive solar racer, take a look at the videos of the University of Texas' Samsung Solorean (the name is a reference to the DeLorean from the Back 2 The Future movies), which are pasted after the break. In a nod towards that movie car, the portal to enter the solar racer opens gull-wing style. Pretty cool. The SunPower A300 solar cells, which cover the carbon fiber body with a Kevlar enclosure, can generate 1.1 kW of power. An on-board battery pack is

Wanna build a solar car? Good new for you, then! Nelson Kruschandl has set up a website where he gives you the ins and outs of solar car construction. Sure, there's plenty of power available from the sun, the tricky part is harnessing enough of it to get anywhere. Therefore, lightweight parts and low power consumption are the name of the game. The make the process as simple to understand as possible, Kruschandl has broken the design down into nine essential components:

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