New here, asteroids prefered

--- In spacesettlers, Gary Church wrote:

> NERVA has an ISP of 850- from a reaction one million
> times more powerful than chemical fuel. Like using a
> napalm airstrike to light a cigarette. The problem with
> any nuclear rocket is containment- it is hard enough to
> keep a chemical rocket from melting. Stan Ulam
> correctly deduced that a fast fission device- a bomb-
> would be the most effective propulsion system for
> spacecraft. That was in 1945 shortly after the first
> one was lit off. It is still the only system that does
> not waste almost the entire amount of energy being
> produced. ISP for a Nuclear Pulse Propulsion system
> would be in the thousands and most probably in the tens
> of thousands.

Nuclear salt water rocket?