Other planets are not going to have the same atmosphere as ours. Chances are we're not going to be able to breath on these planets.
Mathematical nonsense.
There are hundreds of billions of stars in this galaxy alone, with hundreds of billions of galaxies.
Each star has multiple planets.
Eventually, we will find some that support our life.
If i am not mistaken astronomy reached that goal already to find some planets that looks similar to earth that can support living.
So indeed there are really planets which can support human lives. The only problem for now is the tool for transfering humans from the other planets since those planets are a million light years away from the earth.
If you study it, you will find that the requirements for life are so great that we will have to take everything along with us just to stay alive. The odds against life even happening here are so great that we don't understand how life could have happened. Colonizing other planets is way beyond anything we have a chance of achieving with any technology we have available now.
