The last phrases of the article sound like we didn't think long ages already about colonizing space. We're thinking about it from times immemorial, and last ce

The last phrases of the article sound like we didn't think long ages already about colonizing space. We're thinking about it from times immemorial, and last century we think about it too, taking into account our latest understanding of possibilities and dangers. One would hopefully think our expansion is limited mostly by our abilities, not by our doubts?