…about this, then you have a perhaps a bit of homework to do before posting questions about space to a social news site that prides itself on informed, intelligent discussion. Perhaps start with Zubrin's _Entering Space_. Any number of books about the space program will do as well.
For energy, you might want to check out Entering Space by Zubrin, who works through the many options for interstellar travel. One very energy-efficient approach is light sails.. our Sun will definitely keep shining for more than 20,000 years. The other…
…technology we need for a spacefaring society, and probably have had it for some decades. Our economy is stuck in a local maximum, where there is no short-term economic benefit to going there. Read Zubrin's _Entering Space_ for details. http://www.amazon.com/Entering-Space-Creating-Spacefaring-Ci... For example, the original Orion project had a means of traveling to Saturn in a year. (Using nuclear bombs to power a spacecraft.)…
……在洛克希德公司，他不得不眼睁睁看着自己的发明被束之高阁，因为这些技术会压低现有发射技术的成本，这促使他辞职创办了自己的公司。（见他那本极出色的书《Entering Space: Creating a Spacefaring Civilization》。）
…Lockheed and had to watch his inventions shelved because they would have undercut the costs of the existing launch technology, which prompted him to quit and start his own company. (See his outstanding book "Entering Space: Creating a Spacefaring Civilization".)
……造点推进剂，别的就干不了什么了。作为加油站的话可能还行。但除了燃料，月球真派不上太大用场，因为你得先把东西从 LEO 运上去。Robert Zubrin 的《Entering Space》对这点有更详细的技术论证。
…to make some propellants, but not much else. As a refueling station, it could be a good idea. But for anything other than fuel, the Moon doesn't really work out as you have to lift it from LEO first. Entering Space by Robert Zubrin has more detailed technical arguments about this.
In Zubrin's book Entering Space he says in general you should use the radiation pressure of the destination star or the solar wind to decelerate, and I believe published the work to demonstrate its feasibility.
……关于这一点，如果你想在这样一个以言之有物、有深度讨论为荣的社交新闻网站上发帖聊太空，可能得先做点功课。不妨先从 Zubrin 的《Entering Space》读起。关于航天计划的各种书随便找几本读读也行。
…about this, then you have a perhaps a bit of homework to do before posting questions about space to a social news site that prides itself on informed, intelligent discussion. Perhaps start with Zubrin's _Entering Space_. Any number of books about the space program will do as well.
能源方面，你可以看看 Zubrin 的《Entering Space》，他推导过很多星际旅行的备选方案。其中一种能效极高的方法是光帆……我们的太阳肯定还能继续燃烧两万年以上。另一个……
For energy, you might want to check out Entering Space by Zubrin, who works through the many options for interstellar travel. One very energy-efficient approach is light sails.. our Sun will definitely keep shining for more than 20,000 years. The other…
……我们建设太空文明所需的技术，其实可能几十年前就已经掌握了。我们的经济陷在了一个局部最优解（local maximum）里，去那里在短期内看不到任何经济效益。详情可以读读 Zubrin 的《Entering Space》：http://www.amazon.com/Entering-Space-Creating-Spacefaring-Ci... 比如最初的猎户座计划（Orion project），就有一年内飞到土星的方案。（用核弹来推动飞船。）……
…technology we need for a spacefaring society, and probably have had it for some decades. Our economy is stuck in a local maximum, where there is no short-term economic benefit to going there. Read Zubrin's _Entering Space_ for details. http://www.amazon.com/Entering-Space-Creating-Spacefaring-Ci... For example, the original Orion project had a means of traveling to Saturn in a year. (Using nuclear bombs to power a spacecraft.)…
……在洛克希德公司，他不得不眼睁睁看着自己的发明被束之高阁，因为这些技术会压低现有发射技术的成本，这促使他辞职创办了自己的公司。（见他那本极出色的书《Entering Space: Creating a Spacefaring Civilization》。）
…Lockheed and had to watch his inventions shelved because they would have undercut the costs of the existing launch technology, which prompted him to quit and start his own company. (See his outstanding book "Entering Space: Creating a Spacefaring Civilization".)
……造点推进剂，别的就干不了什么了。作为加油站的话可能还行。但除了燃料，月球真派不上太大用场，因为你得先把东西从 LEO 运上去。Robert Zubrin 的《Entering Space》对这点有更详细的技术论证。
…to make some propellants, but not much else. As a refueling station, it could be a good idea. But for anything other than fuel, the Moon doesn't really work out as you have to lift it from LEO first. Entering Space by Robert Zubrin has more detailed technical arguments about this.
在 Zubrin 的《Entering Space》一书中，他说通常应该利用目标恒星的辐射压或者太阳风来减速，而且我记得他发表过论文论证其可行性。
In Zubrin's book Entering Space he says in general you should use the radiation pressure of the destination star or the solar wind to decelerate, and I believe published the work to demonstrate its feasibility.