Green men on alien planets can be found after their death, especially if it turned out to be sudden. This assumption was put forward by American scientists.
After simulating the gases produced by the decomposition of dead tissue, the team concluded that the aliens could be found after their mass extinction. And this is the most realistic scenario for detecting alien civilizations.
The bodies of corpses are reported to give off a pungent gas known as methanethiol. It stays in the atmosphere for 350 years, but gradually turns into a more stable gas - ethane. Elevated levels of ethane in the planet's atmosphere may indicate a post-pocalyptic world in which life existed in a complex form.
After simulating the gases produced by the disappearance of complex life forms, the researchers found that the surviving microbes produce methane, which can be detected with telescopes.
After plants, oxygen-breathing microbes are sent to the next world. In 2 billion years, water vapor and methane will remind of life, and after 2.8 billion years, only methane - the oceans will evaporate. Hell will come.
“I love this model. It is necessary to take into account other gases (not only methane), because in alien life forms, metabolism can proceed differently. We have to look wider,”said Sara Seeger from Massachusetts Institute of Technology (USA).