地球表面低重力直接导致了火星上火山的巨大高度。
The great height of Martian volcanoes is a direct consequence of the planet's low surface gravity.
飞往火星需要六个月。火星具有表面重力、稀薄的大气、冰冻的水、二氧化碳和基本矿物质。
Mars is a six-month flight away, and it has surface gravity, a thin atmosphere, frozen water, carbon dioxide and essential minerals.
两个行星之间最大的不同就是，火星表面的重力比地球上小得多——准确地说，比地球低62%。
But one big difference is that the gravity on Mars' surface is much lower than it is here on Earth - 62% lower to be precise.
将该理论应用到行星这类球体的时候(在本例中，指火星)，质量给定的时候，表面重力与它半径的平方成反比。
When applied to a spherical body like a planet with a given mass (in this case, Mars), the surface gravity will be approximately inversely proportional to the square of its radius.
不同的是月球或火星，小行星不会有什么，如果有的话，重力举行宇航员或车辆在其表面，因此一个锚是必要的。
Unlike the moon or Mars, an asteroid would have little, if any, gravity to hold astronauts or vehicles to its surface, so an anchor would be necessary.
不同的是月球或火星，小行星不会有什么，如果有的话，重力举行宇航员或车辆在其表面，因此一个锚是必要的。
Unlike the moon or Mars, an asteroid would have little, if any, gravity to hold astronauts or vehicles to its surface, so an anchor would be necessary.
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