The Sun aged rapidly, swelling into a red giant hundreds of times its original size.
In a single night, it swallowed Mercury. Terrifying solar flares and solar storms swept across Blue Star, raising the surface temperature to 300 degrees.
To survive, humanity united all its resources to build underground cities and made plans to escape the Solar System.
But human technology advanced far more slowly than the Sun expanded.
Five years later, the Sun swallowed Blue Star, and human civilization was wiped out completely.
