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According to the air space daily, NASA is on an old ideas, namely using ground-based laser or coach handbags
microwave will payload launch into space, which may one day will replace conventional rockets.

The idea is that a group of laser or microwave generator will its light (waves) beam concentrated illuminate spacecraft only heat exchanger. Heat exchanger in turn heating fuel (such as liquid nitrogen), the tailpipe spraying a super heat, will push the lowlands spacecraft orbits.

Scientists call them illuminate hot propulsion, its advantage is a carrier rocket need not join liquid oxygen to ignites liquid nitrogen fuel, and decrease quality. Ordinary coach handbags
rockets fired from time to tome commonly, sometimes need two level 3 bind solid-fuel rockets booster, can launch the payload accounts for only 3% of its quality. Radiation heat propulsion system can make the spacecraft launched into orbit lowlands, payload quality 5% to 15%.

Thus the cost savings obviously, once can put more effective load into low orbit, also saves the assemblycoach handbags
 level 3 rockets cost and manufacturing multistage rocket engine complicated procedure. Such a facilities hardware can continuously use about 1 million hours, then the need for replacement. By using laser systems, need to 8-10 minutes will effectively load into lowlands orbit, use microwave generator 3-4 minutes.