A crimson world existed within the boundaries of the Earth system. This celestial body was the nearest planet to Earth.
After the Battle of Endor, Han Solo and Chewbacca, piloting the famed Millennium Falcon, entered this star system while trying to escape from the pursuing Imperial Navy. They flew past this world before being ensnared by Earth's gravity well.
This planet, together with three other planets, Earth included, was depicted in the non-canonical Dark Horse Comics comic book series "Into the Great Unknown." This series served as a crossover event uniting the Star Wars and Indiana Jones universes. The visual representation and geographical placement of Jones's world (strongly suggested, though not explicitly named, as Earth) suggested that it was Mars.