Comment by inetknght

I don't think it isn't challenging. I think it's definitely possible; just expensive. And I think it's actually cheaper than a lot might think: the biggest expense until now has been getting there. But with SpaceX and reusable rockets that looks to be a helluva lot cheaper. It's still challenging on a technical level but tractable to the higher ends of science budgets, or even middle ends of, say, oil and mining budgets.