Earth Era地球纪元

The main character is an astrophysicist. His friend/colleague (senior), after a strange conversation and parting words, is found burned in his apartment the next day. As farewell words, he says that the hero knows everything. At the same time, the sun begins to go out (the intensity of radiation decreases), which leads to a decrease in temperature, during the investigation it turns out that the deceased knew everything in advance, but for some reason he did not tell anyone. The world is threatened by the ice age to the state of Neptune/Pluto (-200, gas freezing point). So far, the only version of ms involves the intervention of the k2 civilization on the Kardashov scale (the construction of a structure like the Dyson sphere around the sun, which caused the changes), but so far the idea has not gone further due to the lack of evidence. That's all there for now.