我们可能找到了向过去发送信息的方法

WHAT if you could send a message into the past? The laws of physics don’t forbid it – and in fact, in some cases, communicating backwards in time might actually be easier than the usual direction. The possibility of sending a message to the past emerges from a particular kind of solution to the equations of general relativity, our best theory of how space-time, the fabric of reality, behaves. Every object in the universe follows a path through space-time, and one such path allowed by general relativity is called a closed time-like curve (CTC), which sees an object travel into the future before returning to the past and ending up in the present, forming a time loop. …