1. An even smaller type of interplanetary debris is the meteoroid. 有一种更小的星际碎片，是流星体。
2. Soon everyone will be dreaming of interplanetary travel again, he predicts. 他预测，很快每个人都会再次梦想星际旅行。
3. Could those experiments provide insights profound enough to justify the expense of sending people across interplanetary space? 这些实验能提供足够深刻的见解，从而将把人送到星际空间的花费合理化吗？
4. There's nothing like steam heat to warm the cockles of a spaceman's soul as he or she traverses the cold depths of interplanetary space. 当宇航员在冰冷的星际空间漫游时，还有什么能比蒸汽更能温暖他或她的灵魂呢？
5. Cerf has been working with NASA's Pasadena Jet Propulsion Laboratory—the people behind the recent Mars expedition—to design what he calls an "interplanetary Internet protocol." 瑟夫一直在与美国宇航局的帕萨迪纳喷气推进实验室（最近火星探测的幕后人员）合作，设计他所说的“星际互联网协议”。
