Gravity kind of cuts both ways. Closer to that of Earth is nearly guaranteed to be better for long term human health, but there's a possibility that martian gravity is "good enough" when supplemented with excercise while also making heavy operations and getting back out of the planet's gravity well easier.

I wonder if it will turn out to be easier to adapt lifeforms to the planets than to try to adapt the planets to the lifeforms.

Venus seems like a wonderful place to live, relatively speaking.

At the right altitude where you can "float" on the ocean, it's a pretty comfortable temperature and there's plenty of solar energy but you're shielded from the solar radiation. So, long term, your body will still work, assuming you can solve "the other problems."

Of course, the down-side is that there's nothing to stand on and probably more importantly, there aren't many useful materials to work with besides tons of carbon, oxygen, and nitrogen. Not much hydrogen there, so not much water, which probably is the biggest problem. One of them, anyhow. Also, there's probably not a whole lot to do besides float (zoom, actually) around and slowly go stir crazy in your bubble.

But relatively speaking, it's way nicer than living in a hole on mars where you'll slowly die from gravity sickness, or radiation poisoning, or whatever.

If we terraform mars, isn't the dirt still toxic?

Which dome construction material would be transparent to sunlight but block ionizing radiation?