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I have a wide range of hobbies such as doing sports, playing musical instruments , and reading. I enjoy playing basketball and tennis. As for music preference, I love rock musics, classical musics, and musical plays. In addition, I play the electric guitar and used to play in a band. Being a forum lover, I enjoy having great conversations with friends , discussing social issues or any other interesting topics. Learning new things is one of my favorite things in life. Welcome to my blog and feel free to share your ideas with me. Learning can be so much fun and the opportunity to learn with others just makes it even better!

Friday, November 20, 2015

微波雷射火箭減低火箭發射預算

自從人類開始發射火箭已經有50年左右的時間了。但是火箭發射的成本還是相當的高。要把火箭發射到地球的行星軌道上,平均一公里的距離就要花費5000到50000美元不等。火箭的發射是很沒有效率的,因為火箭90%以上的重量都是發射要消耗的燃料。如果能減少這些燃料的重量,發射所消耗的能量就會減少也較容易。
俄國科學家Konstantin Tsiolkovsky 提出了用微波雷射作為火箭能量來源的想法。利用這個雷射來加熱火箭上的燃料進而產生推進力。這名科學家題到,要讓火箭達到能夠脫離地球引力的速度,這是最吸引人的方法。雖然這種雷射早在1950年代就被發明了,但是能夠把這種雷射以高能量放出的儀器直到最近才發明出來。想要把這種雷射應用在火箭發射,就必須要產生百萬瓦特以上的高能量雷射。這也是為甚麼要到現在才有可能應用這項技術。
有興趣的話可以去看原文:http://www.scientificamerican.com/article/microwave-powered-rockets-would-slash-cost-of-reaching-orbit/

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