評論
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Jupiter is more than three hundred times bigger than Earth,
木星比地球大300多倍
so it has a massive gravitational field.
所以它具有巨大的萬有引力
This attracts dangerous flying objects that might otherwise hit Earth.
這會吸引危險的飛行星體否則就會向地球飛來
Jupiter is Earth s protector.Scientists have even seen it in action.
木星是地球的保護神 科學家甚至親眼見到過
In the early 1990s,a comet was captured by Jupiter's powerful gravity.
在20世紀90年代初 一個彗星被土星巨大的引力捕捉到
It broke up into many different pieces,which smashed into the planet.
它碎成了許多片 撞到了土星上
Some of the blasts left scars as big as Earth itself
有些爆炸留下的痕跡和地球一樣大
Without Jupiter, it's likely Earth would have been pummelled
沒有土星，地球可能會每隔一萬年
by huge impacts like this e very 10,000 years or so.
就受到一次這樣的沖擊
Under that kind of bombardment,it's hard to imagine how complex life could ever have got going.
在這樣的轟炸下 很難想象復雜生命可以延續(xù)
Any planet that's to be a home to complex life needs liquid water,
任何星球想產生復雜生命都需要液態(tài)水
a sun that doesn't burn out too quickly and a giant neighbour to protect it from meteorites.
太陽不會很快蒸發(fā)它 有個巨大的鄰居保護它不受隕石侵襲
