Space colonisation won't get properly going until we have adequate robotics, nanotech, and maybe genetics, for the job of prefabbing complete self-sustaining habitats which utilise only local resources.

"Sufficient unto the task" is likewise tautologous, I suppose. But simply saying "until we have robotics" is absolutely not what I mean. Oh, and we also need AI, which I'd subsumed under robotics.

Nope, not trying - stating that our current level of technology is inadequate unto the task. The task is clear.

NASA

In the space shuttle the RS-25 engines were reusable, this article doesn't say if this will be the case in the SLS.

space launch system.

http://www.nasa.gov/pdf/664158main_sls_fs_master.pdf

Maybe it could float engines up?

PM

Did the Soviets Actually Build a Better Space Shuttle?

http://www.popularmechanics.com/science/space/rockets/did-the-soviets-actually-build-a-better-space-shuttle-16176311

Using newer and more powerful infrared telescope technology, able to detect brown dwarfs as cool as 150 kelvins out to a distance of 10 light-years from the Sun,[10] results from the Wide-field Infrared Survey Explorer (WISE survey) have not detected Nemesis.[11][12] In 2011, David Morrison, a senior scientist at NASA known for his work in risk assessment of near Earth objects, has written that there is no confidence in the existence of an object like Nemesis, since it should have been detected in infrared sky surveys
http://en.wikipedia.org/wiki/Nemesis_%28hypothetical_star%29

The chief evil in these documentaries is that bloody drum track

If, a million years hence, we cannot protect ourselves from comet showers, we deserve to be bopped on the head by big space rocks anyway.

You are utterly irrelevant to the statement

The statement does not care about your petty parochial concerns