How to will we colonize other planets in the Star System?

Outer parts of the Star system have been considered for future colonization on the system, This involves many manned missions onto the surfaces that we cosmically plan for colonization among their surface!, This could potentially include robotic cosmic machines controlled by humans and sent into space searching on their atmoshphere for signs of oxygen mineral....

To make human life presence on them... the planet needs to have is!

Because for us beings actually our planet is filled with this chemical gas which means that the Earth's Surface is basically habitable and capable of holding us for most timelines in the far future!
 * Oxygen
 * Nitrogen
 * Sulfur
 * Other 5.....

Here are planets manned for future colonization and human habitation! This planet came into existence after earth and is the fourth planet that formed from its potential star, And among the second-smallest decent planet in the Star System, for years and possibly centuries, this planet have been considered to have inhabited by such technological beings whom have very superior technology, NASA Recently plans to explore that region in a manned mission in the 2020s
 * Mars


 * Saturn's

Moon "Europa" This moon is among the largest in the whole cosmic system, It's surface is ocean-like from our oceans on the home planet and its one of the largest moons and known with the high chances of supporting any water species, This moon orbits its planet every 25 days!