Right, at least two of the planetoids I mentioned need to be terraformed to get to a point where the air is breathable. But they can still get to a point, with human intervention, where life can eventually be stable. Also, in addition, all of them have seemingly perfect gravity for humans, without human intervation, which makes me believe that in the Alien Universe, it is more than common to find planets and moons with the capacity for life. And with FTL travel within this universe, those planets and moons that can bear life may as well be as close to us as Mars or Jupiter are to us now with our currents space travel capabilities.
Which is why I'm saying I don't believe it to be chance that WY decided on LV-426 to be the site of Hadley's Hope. You guys really don't think there's more insidious intentions behind such a decision? Especially when LV-223 is right next door?
Also, the Engineers couldn't survive on LV-223 without suits, which is why their pyramids acted as terraforming stations with breathable air cleaner than Earth's. Humans and Engineers can breathe 223's atmosphere for at least a couple minutes before succumbing to carbon dioxide poisoning, as mentioned in Prometheus.