计算这个角度可以让天文学家测量地球到太阳的距离，这是当时的终极目标。
Calculating this angle would allow astronomers to measure what was then the ultimate goal: the distance of the Earth from the Sun.
这是因为目标将处于地球上空约500公里处。
This is because the object will be about 500 kilometers above the Earth.
他的长期目标是，如果有灾难降临地球，就把100万人安置在那里。
His long-term goal is to put one million people there if something bad happens to us here on Earth.
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