The moon's low gravity also means that water composed of regular hydrogen and oxygen will escape quicker than heavy water, perhaps leading to a concentration of deuterium in the water of the moon.

月球的低重力也意味着由普通氢气和氧气组成水将会比重水更快的消失，可能导致在月球上水的氘含量。

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At the moment, materials like concrete, steel and aluminium wouldn't even get close because they are too heavy and the force of gravity pressing on them would eventually make them collapse.

目前，像水泥、钢铁和铝这种材料根本不能达到要求，因为它们太重，而且他们受到的重力最终会让它垮塌。

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The London exhibit displayed the model Hawking once used to explain his ideas about the unimaginably dense, heavy objects whose powerful gravity swallows up everything that comes close, even light.

这次伦敦的特别展览还展出了霍金曾经用来解释他想法的模型，即无法想象密度的沉重物体，其强大重力吞没接近的一切，甚至是光。

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Presto -- the heavy socks defy gravity by clinging to her legs midway between ankle and knee.

CNN: A SOCK TO THE SYSTEM

There is, however, scope for new laws of gravity that affect light and heavy objects differently, or involve a modification of the concept of inertia.

ECONOMIST: A space oddity

Lifting heavy spacecraft and fuel out of the Earth's gravity is expensive.

CNN: Bush: 'It is time for America to take the next steps' in space