科学家在星期一说，一艘环绕火星飞行的遥控的宇宙飞船拍摄到该行星北极附近一系列主动雪崩的首张照片。
A robotic spacecraft circling Mars has snapped the first image of a series of active avalanches near the planet's North Pole, scientists said Monday.
但在1970年代更多的拜访这个行星，这些宇宙飞船环绕火星飞行或者在火星着陆，这有很多的观察到火星的细节。
But, then there were more visitors to the planet in the 1970s, and this time the spacecrafts didn't just fly by, they orbited it, or landed it.
据说宇宙飞船到2100年飞行速度可达光速的一半，这样的话，我们只要两三天就能到达火星，但你能想象人类真能在火星上住吗？
It is said that spaceships can travel at half the speed of light by 2100. It might take us two or three days to get to Mars. Can you imagine humans' life on Mars?
据说宇宙飞船到2100年飞行速度可达光速的一半，这样的话，我们只要两三天就能到达火星，但你能想象人类真能在火星上住吗？
It is said that spaceships can travel at half the speed of light by 2100. It might take us two or three days to get to Mars. Can you imagine humans' life on Mars?
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