什么是引力?在各种基本力中,人类对引力了解得最少。它是否真的象爱因斯坦提出的那样,跟光和其他电磁辐射类似,是具有从极短到若干哩长的波长的一种形式的波?没有人确切知道。目前,在数年努力的基础上,全世界的科学家为对引力的本质进行探索,他们使用现有的仪器,并设计新的装置,进行着各种试验,并得到了可喜的成果。 What is gravitation? In all kinds of basic forces, humans have the least knowledge of gravitation. Is it really, as Einstein proposed, a form of wave having a wavelength from very short to several miles long, similar to light and other electromagnetic radiation? No one knows for sure. Today, based on years of hard work, scientists around the world are exploring the nature of gravity by using existing instrumentation, designing new devices, conducting experiments, and receiving gratifying results.