法国科学家们近来发现了过去的极端环境是如何影响植被把阳光反射到太空中的。这些结果将为人们寻找远古生命带来希望。从远处看,我们居住的地球只是太空中的一个光斑。尽管我们已经把无线电信号发射到太空中,希望潜在的宇宙生命能够接收到,但是这些信号传播的距离都不超过几十光年。其实人类在数百万年间一直在向宇宙发送信号,表明他们的存在。陆生植物发射很强的红外线,结果使这 French scientists recently discovered how past extreme environments affected the vegetation that reflected sunlight into space. These results will bring hope for people to find ancient life. From a distance, the Earth we live in is just a spot in space. Although we have launched radio signals into space and hope that potential cosmic life can be received, these signals do not travel for more than a few dozen light-years. In fact, humans have been sending signals to the universe for millions of years to show their existence. Terrestrial plants emit strong infrared rays, resulting in this