Comment Populate the oceans (Score 2) 438
Learning how to live underwater would teach us how to live in space, and will get us used to living underwater on planets/moon such as Europa. Since 3/4 of the planet is covered in water, maybe we can spread "West" into the ocean? It's prettier down there anyway and chicks dig dolphins. Running out of air down there would be less consequential than in a vacuum. Most likely we will be shooting for a planet outside our solar system only if it has water. High radiation levels etc would be easier to avoid underwater, and I think it would take a long time for oceans to evaporate should global warming become global boiling.