I need to.find.the article.proposing Venus colonization,.but.in short: Venus has very dense atmosphere, it.was figured out that a balloon filled with Earth air at 1 ATM will float high enough in Venus to have a reasonable temperature, and can.be driven as needed to follow sun and shade as required. The only problem with that setup.is that mining would.require some tether technology we don't have, but that Venus idea is still.better than mars, because it is cheaper to do, have more energy available, and the expected conditions of the balloon is closer to here than anything we can figure on mars