建造冰天的目的是阻挡地球受到太阳射线和其他穿越太阳系的危险的宇宙射线。
This was done to protect planet Earth from the radiation of the Sun and other dangerous cosmic radiation that regularly come through the solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
The Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
机遇号和她的同胞机器人勇气号自从2004年初就开始探索这颗红色的星球了，找到了古老的水的证据，并且穿越内太阳系发送除了令人窒息的图片。
Opportunity and sister robot Spirit have been probing the red planet since early 2004, finding evidence of ancient water, and sending breathtaking images across the inner Solar System.
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