The biggest experiment, with arms up to four kilometres (about two and a half miles) long, is called the Laser Interferometer Gravitational Wave Observatory, or LIGO.
The biggest experiment, with arms up to four kilometres (about two and a half miles) long, is called the Laser Interferometer Gravitational Wave Observatory, or LIGO.
有着4公里（约2.5英里）长的激光干涉管臂的实验装置，被称作激光干涉重力波观象台或LIGO，迄今为止是世界上同类最大的实验装置。