[XBob]

267 - and once we frog hop part way out of our deep gravity well, just where do we frog hop to?

[js1138]

I said you need imagination. For one thing, the far side of the moon would make an excellent observatory for both visual and radio astronomy. For another thing it would provide an excellent vacuum for manufacturing, and the vacuum would allow products to be rail-gunned to earth without propellants.

That's a start. The observatories could be robotic, and the factories possibly.