There's no need for a replacement, though. We should use this as a springboard, if it's handled intelligently, to focus on the real goal, which is getting to Mars as quickly as possible. We don't need an Orbiter to do that. It was a useless sidetrack, and that makes this tragedy all the worse. The Challenger, too.Enlightenment wrote:The shuttle program is basically dead at this point. It will have to be grounded for an investigation but that will take so long (years) that there will be no point in reactivating the fleet afterwards.
There is a very real risk that the space age is now over. The only replacement on-offer (a mini-Shuttle launched on an ELV) is decades away and NASA should lack the public confidence of the US government to be given the money to build a replacement.
The Russians are more than capable of supporting a space station if they had the money to do it; they have the available vehicles and the production lines for them. Indeed, I suspect they could probably send the rest of the ISS into orbit on their boosters.The ISS can't keep operating--and certainly can't be completed--in the absense of the shuttle for a prolonged period. The station may need to be abandonded.
The problem, of course, is the omnipresent funding. We would have to be willing to provide the Russians with enough cash to do it. I think it is a reasonable expenditure, even if we logically shift gears towards Mars and abandon Orbiters, simply to maintain the permanent space presence, gather potentially useful further data for such a mission, and as a potent symbol.
But we must not let this tragedy blind us to the fact that ultimately the reusable space-plane concept is in truth a dead-end in terms of lifting viable payloads into orbit, or manned exploration of the solar system. I just hope the courage is there not to let these intrepid explorers die in vain; rather that we should press on ahead to bold and fortright endeavours in their name.