An astronaut exploring an unknown planet could do at least part of his exploration without leaving his spacecraft . 探测未知星球的太空人，至少有一部分工作他可以不离开太空船来进行。
We are now thrusting forward to the stars , and the conquest of space no longer strikes us as wellsian or jules vernian . 所以正在向星球挺进，征服宇宙已不再象威尔斯或朱尔斯凡尔纳的作品那样使我们吃惊了。
A burnedout star could collapse to so small a radius as to make the effects of general relativity quite important near its surface . 一个燃烧完的星球可能坍缩到如此之小的半径，以致在其表面附近，广义相对论效应相当重要。
It dawns on us rather suddenly that the number of passengers on the small spaceship we inhabit is doubling about every forty years . 我们几乎是突然认识到，我们居住的这个小小星球上的旅客人数，正以大约每四十年翻一番的速度在增长。
Conversely , intelligent beings which are just beginning to develop on remote worlds may be ready to pick up our signals in thousands of years . 反过来说，其他星球上的刚刚开始进化的智力生命，他们要过几千年之后，也许才可能收到我们的信号。
Destruction of the planet games - 4455 miniclip games 毁灭星球小游戏- 4399小游戏
Come on , dad . we ' ve got a planet to save 快点，老爸整个星球都等着我们去拯救呢
Another source of neutrinos is from dying stars 另一个中微子源，是垂死的星球。
Which determines the totality of life on this planet 决定着这个星球的全部生活
