Originally Posted by
Endus
Long-term, things get even more exciting, since once SpaceX gets this stuff worked out and in production, they can refocus.
This stuff is great for manned flights, for exploratory missions to the Moon and Mars, and for scientific exploration/testing. We can lift a bunch more, and that's great. But the next big step, after this one, will be establishing a permanent foothold. And I don't mean upgrading the ISS. I mean a proper space station.
The amount of mass required is insane; you're talking about a framework that has to support dozens if not hundreds to thousands of people, in a permanent sense, which means you don't want to be shipping oxygen and food and such from the ground, not after you get it established. It's just too expensive to justify doing so; that's why we've never made the effort.
There is a way around this, though. We can refine and process ore to produce metals in situ. We don't have a source, but with these rockets, we can get it.
You fly some engines with drill attachments on the nose out to an asteroid. You'd need a bunch for attitude control and the like, and possibly a bunch for the main thrust vector. With the tech SpaceX is showing, we don't need to man any of this. We fly them out, they attach themselves to the rock, and then you nudge it back to Earth space. It's probably easiest to grab a near-Earth object, but this also lets us clean up our planet's orbit, which is a secondary benefit. Once it's in a stable orbit (not terribly close; it doesn't need to be in a nearby orbit, just somewhere in the range between here and the Moon), you move the industrial systems in, mine it to pieces, refine it in space, and transport from that site to the build site costs absolute peanuts; you need to nudge it in the right direction, and unless you're in a rush, you can let it drift there at whatever speed is desirable.
If you need to refuel the boosters, we could pretty easily do so, mid-flight.
Once we can produce literally tons of metal structural components in orbit without lifting it, building massive orbital frameworks becomes FAR less expensive. There's a significant investment to GET there, and it's an investment with a long-term payoff (years), but the long-term gains are immense. This is why proposals for this are already being made.