The sun ages rapidly, expands into a red giant, and expands hundreds of times in size.
Mercury was engulfed overnight, terrifying solar flares and solar storms swept across the blue star, and the surface temperature rose to 300 degrees.
In order to survive, human beings unite all forces to build underground cities and plan to escape from the solar system.
However, the progress of human science and technology is far slower than the expansion rate of the sun.
Five years later, the sun engulfed the Blue Star, and human civilization was completely destroyed.
