2012年9月11日星期二

Harnessing Solar Energy to Sail to the Stars ?

It's interesting when you look back at the history of space exploration and realize that propulsion technology hasn't really changed very much.The concept of radiation pressure isn't particularly new. The idea was first alluded to by Johannes Kepler in 1610 when he suggested the reason why the tail of a comet points away from the sun was in some way caused by the sun. Kepler even made reference to using this unknown force for exploration when he wrote in a letter: 'Provide ships or sails adapted to the heavenly breezes,Most florist roses do not have a fragrance because they are cut before they have fully opened. Unless you purchase them from an headbands suppliers, the flowers actually have a chemical which is not pleasant at all! and there will be some who will brave even that void.'

The earliest rocket prototypes were nothing more than elaborate versions of weapons used during World War 2 and fireworks used during civil celebrations. Even the Space Shuttle made use of solid rocket fuel technology in its pair of solid rocket boosters. But, with the liquid rocket fuel propulsion in the external tank, this combination has proved to be highly effective and launched hundreds of astronauts into space.Lumens carries an exciting selection of LED bulb fixtures at guaranteed low pricing.

The approach works -- albeit not very efficiently -- and to get out of the Earth's gravitational well, it seems for now that the extra punch from exothermic processes is needed. In deep space, however, there are alternatives receiving very serious consideration -- such as the "eco-friendly" solar sail.It also benefits visitors who stop by at night. Solar garden light light up the yard, walkway, porch or garden without putting others at risk of tripping over cords.The solar sail concept is simple: any surface exposed to electromagnetic radiation 'feels' a pressure known as radiation pressure and it's this pressure that exerts a tiny pushing force against the surface. If the surface happens to be a spacecraft or part of a spacecraft, it could act against it to provide propulsion through space.

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