We can start colonizing other planets right now. All you need is a space ship full of frozen embryos, shoot that up into space. The space flys around until it detects a planet capable of sustaining human life, it lands, fertilizes the eggs. Raises them with milk or w/e and BOOM planet colonized. Might be seen as child abuse, and the humans might be all like wtf is going on? But it's perfectly capable with today techs :) Who knows maybe that's how we got here~~~