writes: Many Slashdot readers will have heard of Robert Zubrin with his plans for launching self-contained rocket fuel plants to Mars to convert 1kg of hydrogen (supplied from Earth) to 18kg of oxygen/ methane to be used as rocket fuel to return explorers to Earth. This is an example of Utilizing (using) In Situ (already there) Resources (Mars' CO2 atmosphere) to reduce launch costs (masses) from Earth to achieve desired aims in space exploration at more affordable costs.
In 2013, the Journal of Aerospace Engineering ran a special volume on "In Situ Resource Utilization" with 20 papers on the subject. (These are paywalled, unless you know of tools like Sci-Hub to read the work paid for by your taxes.)
Yesterday, one of the editors of that special volume, Philip Metzger (a NASA planetary scientist specialising in the properties of Lunar soils) released a paper on Arxiv expanding on his contribution to that 2013 volume and detailing a roadmap for humanity to take gain control of the Solar System in order to solve problems on Earth. In the 2013 paper, Dr Metzger asserted (with working) that
bootstrapping can be achieved with as little as 12 t landed on the Moon during
a period of about 20 years. [ I know it's Slashdot but RTFAFFS ! ...] The industry grows exponentially because of the free real estate, energy, and material resources of space. The mass of industrial assets at the end of bootstrapping will be 156 t with 60 humanoid robots or as high as 40,000 t. [...] Within another few decades with no further investment, it can have millions of times the industrial capacity of the United States. Modeling over wide parameter ranges indicates this is reasonable, but further analysis is needed.
The 2016 Arxiv paper produces some of the results of that further analysis, concentrating in particular on the need to develop a "water economy [..] to manufacture rocket propellant" from in situ resources on the Moon and later the asteroids.
The 2013 paper's abstract ends with one of the milder understatements in history.
"This industry promises to revolutionize the human condition."
Without doubt, Slashdot will contribute much heat and little light from typing hordes who haven't read either paper to dilute their ignorance, but analyses like this are not, as frequently described, the work of "space nutters" but realistic possibilities. Realistic until the author sees the fatal stumbling block to all such dreams :
"It will require a sustained commitment of several decades to complete."
— a level of dedication that humans have not shown themselves capable of for centuries, even for their highest achievement to date, war.