这是宇宙的残酷笑话。人的寿命根本不会扩展到宇宙的不可解表。我们最近的邻居是Canis Major Dwarf Galaxy，距离酒店有25,000个光。即使你可以在深夜悬浮在深夜的旅行中，或者在光速旅行的混淆法律上冻结 - 你在地球上所知的每个人都会很长一段时间。事实上，我们文明的历史的时间扩展将发生五次。
为了旅行星星，我们可能需要留下我们所知道的一切。
在这种光线下，单向票， 经过约瑟夫波普尔，看起来不太极端。他的建议是为了一个单向之旅进入太空，这是一个由宇航员驾驶的宇宙飞船，他们知道他们没有任何回家的可能性。The idea unto itself isn’t entirely new, but Popper has proposed this one-way voyage for a two-year excursion to Mars, at which time oxygen and food supplies will have run out for the pilot, and the ship will continue on into the galaxy. It’s all based on current science and technology. And his “zero budget, zero gravity” film is a haunting exploration of the idea–episodes transmitted from a ship in which one man leaves Earth in a capsule of his own thoughts.
但是，虽然单向旅行到太空似乎对我们中的许多人来说都不那么疯狂，但是火星的单程之旅会觉得浪费，因为有足够的资金，我们可以在人类寿命中获得很好的方式使这个往返机围绕（火星群简单地证明了一种更谨慎的方法，探讨了人类之前探索了地形和氛围，并希望最好）。The biggest catch, really, is funding, and the fact that current legislation doesn’t have NASA’s manned mission to Mars on the books until 2030. (You could argue that better propulsion technology that’s on the horizon would make the trip faster, too, meaning there is some logic behind a 2030 launch date beyond budgetary prudishness. You could also argue that funding such a trip would lead to faster innovations in that space.)
