The Far Horizons (5e Campaign Setting)
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Ever since the true reason the Sun shone was revealed, people realized that the Kelvin--Helmholtz mechanism would only allow for perhaps a million more years of life before the Sun got too cold to support life on Earth. Countries have since been looking for cheap ways to keep on living, whether around other stars or reactivating this one. Presumably, this happened to the Martians as their civilization waned hundreds of thousands of years before ours did.
This is the history of the solar system, divided into eras.
For detailed history in the setting refer to History (The Far Horizons Setting).