Profound differences in the geologies of Earth and Mars might stem - as two scientists are now suggesting - from Mars' developing only two to four million years after the birth of our solar system.

根据两位科学家现在的估测，地球和火星之间巨大的地理性差异可能是因为在太阳系形成后，火星的成长史只有短短的二百万到四百万年。

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Profound differences in the geologies of Earth and Mars might stem -as two scientists are now suggesting -from Mars' developing only two to four million years after the birth of our solar system.

根据两位科学家现在的估测，地球和火星之间巨大的地理性差异可能是因为在太阳系形成后，火星的成长史只有短短的二百万到四百万年。

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The scientists are developing a kind of plant to grow on Mars.

科学家正在培育一种可以在火星上种植的植物。

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So this information changed our thinking about the chances of life developing on the planet and Mars stories from before 1965 would most likely have significant inaccuracies.

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The Mars group has been developing the 1.5 metre (5 ft) long B4 hybrid engine for over three years.

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This is the ship the US space agency (Nasa) is developing to send astronauts beyond the ISS to destinations such as asteroids and Mars.

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