Once upon a time, there was a thriving civilization living under the light of a warm yellow sun. As eons passed, the civilization spread. It advanced. It regressed. It advanced again. It rose. It declined. And it rose again. It changed, became unrecognizable from its past self. And as the civilization did, so did the sun that burned above it and smiled down upon it. The warm yellow sun was aging, and as it did, it grew warmer and warmer, and bigger and bigger, darker and darker, yellow to orange to red, until the smiling yellow sun became a glaring red giant.