We actually cannot, unless some excellent new technologies begin to exist, you will run afoul of entropy or plain lack of space. Not to mention energy distribu

We actually cannot, unless some excellent new technologies begin to exist, you will run afoul of entropy or plain lack of space. Not to mention energy distribution network will be a problem. You would also have to make actually truly positive energy input rockets, which has not happened. (Price is not materials or work.) It's still a relatively high bar until we mine out Earth, but water might be a more pressing problem soon. (Desalination at mass scale is very expensive.)