It's not extensive in the sense that you just have to scatter your stuff over wide fields; that's not what it is.

它不是你泛泛的在宽广的,土地上播种就够了,它并非只是这样

耶鲁公开课 - 古希腊历史简介课程节选

In fact, there's a property of gravitational fields anywhere, even in outer space, but there is some residual field between all the planets and all the stars in the universe, that the force on a body is proportional to the mass of the body.

实际上,这是任何地方的引力场都具备的属性,甚至是在外太空,在所有的行星和恒星之间,存在着某种剩余场,在这个场里作用在物体上的力,和物体的质量之间存在比例关系

耶鲁公开课 - 基础物理课程节选