Another possibility is that the accelerated expansion arises not from a substance but from a modified form of gravity, one that behaves differently on cosmic scales of time and space.

另一种可能性是加速膨胀不是来自物质而是修改的重力形式，其作用在时空的宇宙尺度上是不同的。

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For example, the use of wheeled vehicles to transport goods and the separation of materials by gravity-gradient processes can be modified to be used in lunar conditions.

举例来说，轮式载重车辆和依赖重力实现材料剥离的技术，经过改进是可以在月球重力条件下使用的。

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The more precisely w comes to look like -1, the more enthusiasm there will be for cosmological constant theories, which require that value, and the less enthusiasm there will be for fifth forces and modified gravity, part of the charm of which is that they can work with other values.

ECONOMIST: Cosmology

The four current NASA pilots who can operate the modified 747 are ex-military aviators who split their time flying other planes including zero-gravity aircraft and T-38 supersonic jets.

MSN: What it's like to fly a plane carrying shuttle - Technology & science - Space | NBC News