Now is a good time to buy real estate on Titan, the largest of Saturn's moons.
Land there is dirt cheap.
But wait 5 billion years when the sun begins its journey into retirement. Then it is time to reach for sunscreen with an S.P.F. of 2,000, or pack up your belongings and take the next space shuttle to a place with a more hospitable climate. That could be Titan, a moon larger than the planet Mercury and about half the size of Earth. Titan is one of the safest bets to colonize because it is far enough from the sun's death rattles, and it has an atmosphere to trap heat. For those who find searing heat appealing, stick around.