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2014-3-26 21:08| view publisher: amanda| views: 1004| wiki(57883.com) 0 : 0

description: There will be a very high initial investment cost for space colonies and any other permanent space infrastructure due to the high cost of getting into space. However, proponents argue that the long-te ...
There will be a very high initial investment cost for space colonies and any other permanent space infrastructure due to the high cost of getting into space. However, proponents argue that the long-term vision of developing space infrastructure will provide long-term benefits far in excess of the initial start-up costs. Therefore, such a development program should be viewed more as a long-term investment and not like current social spending programs that incur spending commitments but provide little or no return on that investment.

Because current space launch costs are so high ($4,000 to $40,000 per kilogram), any serious plans for space colonization must include developing low-cost access to space followed by developing in-situ resource utilization. Therefore, the initial investments must be made in the development of low-cost access to space followed by an initial capacity to provide these necessities: materials, energy, propellant, communication, life support, radiation protection, self-replication, and population.

Although some items of the infrastructure requirements above can already be easily produced on Earth and would therefore not be very valuable as trade items (oxygen, water, base metal ores, silicates, etc.), other high value items are more abundant, more easily produced, of higher quality, or can only be produced in space. These would provide (over the long-term) a very high return on the initial investment in space infrastructure.[17]

Some of these high-value trade goods include precious metals,[18][19] gem stones,[20] power,[21] solar cells,[22] ball bearings,[22] semi-conductors,[22] and pharmaceuticals.[22]

“    ... the smallest Earth-crossing asteroid 3554 Amun ... is a mile-wide (2 km) lump of iron, nickel, cobalt, platinum, and other metals; it contains 30 times as much metal as Humans have mined throughout history, although it is only the smallest of dozens of known metallic asteroids and worth perhaps US$ 20 trillion if mined slowly to meet demand at 2001 market prices.[18]    ”
Space colonization is seen as a long-term goal of some national space programs. Since the advent of the 21st-century commercialization of space, which opened cooperation between NASA and the private sector, several private companies have announced plans toward the colonization of Mars. Among entrepreneurs leading the call for space colonization are Elon Musk, Dennis Tito and Bas Lansdorp.[23][24][25]

Potential sites for space colonies include the Moon, Mars, asteroids and free-floating space habitats. Ample quantities of all the necessary materials, such as solar energy and water, are available from or on the Moon, Mars, near-Earth asteroids or other planetary bodies.

In 2005, then NASA Administrator Michael Griffin identified space colonization as the ultimate goal of current spaceflight programs, saying:

“    ... the goal isn't just scientific exploration ... it's also about extending the range of human habitat out from Earth into the solar system as we go forward in time ... In the long run a single-planet species will not survive ... If we humans want to survive for hundreds of thousands or millions of years, we must ultimately populate other planets. Now, today the technology is such that this is barely conceivable. We're in the infancy of it. ... I'm talking about that one day, I don't know when that day is, but there will be more human beings who live off the Earth than on it. We may well have people living on the Moon. We may have people living on the moons of Jupiter and other planets. We may have people making habitats on asteroids ... I know that humans will colonize the solar system and one day go beyond.    ”
“    In the 2,900 km³ of Eros, there is more aluminium, gold, silver, zinc and other base and precious metals than have ever been excavated in history or indeed, could ever be excavated from the upper layers of the Earth's crust.[20]    ”
The main impediments to commercial exploitation of these resources are the very high cost of initial investment,[27] the very long period required for the expected return on those investments (The Eros Project plans a 50 year development.[28]), and the fact that the thing has never been done before — the high-risk nature of the investment.

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