a voyage outside the Earth's atmosphere

since most of the cost of space travel is the launch, the price might come down even more if the private sector can lower the costs of getting into orbit.

因为太空旅行最大的开销就是发射，一旦私人公司可以降低发射成本，旅行价格甚至可能会下降得更多。

eventually, i hope our system can reveal more about space radiation effects on dna and cells, leading to options for safe space travel and exploration by humans.

最终，我希望我们的设备能揭示更多太空辐射对dna和细胞的影响，从而引导人们安全的太空旅行和太空探索。

in low earth orbit, say 220 miles (355 km) up, where most human space travel takes place, a single circuit is completed in a much brisker 90 minutes.

在近地轨道，例如高于地球表面220英里（355公里）处大多数人类太空旅行发生的地方，运行一圈则需要更短的90分钟。

it might be kind of fanciful to some, but on the other hand, space travel was considered science fiction not that many decades ago.

对于某些人，它可能只是种幻想，但换句话说，几十年前，太空旅行不也是被认为是科幻小说吗。

he was acknowledging that aviation offered no guidance for how space travel was likely to unfold.

他也承认，航空产业经验对如何拓展太空旅行产业提供不了什么指导。

the idea is that as space travel becomes more common, it will foster new commercial research and adventure tourism.

想法是这样的，随着太空旅行变得更普及，它能培育新的商业研究和探险旅游。

many elements of space travel series and films borrow extensively from the conventions of the western genre.

太空旅行系列片和电影从西部片传统里借用了许多元素。