2002: SpaceX was founded by Elon Musk with a goal of reducing the cost of space travel thus getting humans on Mars.

2008-2015: Numerous successful tests of the Falcon 1, and Falcon 9 rockets as well as the Dragon cargo ship.

2016: Musk announces his Mars colonization plan.

2018: Send unmanned Dragon capsule to deliver cargo to Mars, as well as begin ship, booster, and orbital testing.

2022: Actual manned flights to Mars set to begin.

50-100 years down the road: Establish sustainable million person civilization on the Red Giant.