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Many arguments have been made for space colonization. The two most common are survival of human civilization and the biosphere in case of a planetary-scale disaster (natural or man-made), and the vast resources in space for expansion of human society. Many parts of the outer Solar System have been considered for possible future colonization. Most of the larger moons of the outer planets contain water ice, liquid water, and organic compounds that might be useful for sustaining human life. Colonies in the outer Solar System could also serve as centers for long-term investigation of the planet and the other moons.
The colonization of the Moon is the proposed establishment of permanent human communities or robotic industries on the Moon. Recent indication that water might be present in noteworthy quantities at the lunar poles has renewed interest in the Moon.
Because of its proximity to Earth, the Moon has been seen as the most obvious natural expansion after Earth. There are also various projects in near future by space tourism startup companies for tourism on the Moon.
Asteroid Mining May Be a Reality by 2025. Asteroid mining is the exploitation of raw materials from asteroids and other minor planets, including near-Earth objects. Minerals and volatiles could be mined from an asteroid or spent comet then used in space for in-situ utilization (e.g. construction materials and rocket propellant) or taken back to Earth.

Planetary Resources is the Washington-based asteroid-mining company aims to launch a series of increasingly ambitious and capable probes over the next few years.
The terraforming of Mars is the process by which Mars's climate and surface would be deliberately changed to make large areas of the environment hospitable to humans, thus making the colonization of Mars safer and sustainable. The surface gravity on Mars is 38% of that on Earth. It is not known if this is enough to prevent the health problems associated with weightlessness. Mars's atmosphere has about 1% the pressure of the Earth. It is estimated that there is sufficient CO2 ice in the regolith and the south polar cap to form a 30 to 60 kPa atmosphere if it is released by planetary warming. The reappearance of liquid water on the Martian surface would add to the warming effects and atmospheric density.
Terraforming Venus was first seriously proposed by the astronomer Carl Sagan in 1961, although fictional treatments, such as The Big Rain by Poul Anderson, preceded it. It would require at least three major changes to the planet. 1) Reducing Venus's surface temperature of 462 °C (864 °F) Firefighter suit can withstand temperatures up to 700 degrees Fahrenheit (370 degrees Celsius) 2) Eliminating most of the planet's dense 9.2 MPa (91 atm) carbon dioxide and sulfur dioxide atmosphere, via removal or conversion to some other form 3) Addition of breathable oxygen to the atmosphere.
Many prominent scientists and technologists, such as Stephen Hawking, Carl Sagan, and Elon Musk, have expressed confidence that humans will be able to colonize the Universe. Some believe that unless humanity is wiped out beforehand, colonizing the universe is inevitable. Of course, we have yet to step foot on the Mars, so we are probably a long way off from colonizing the galaxy, or even the universe. But, if we were to try it, how would we go about it?
As our Earth orbits lazily around the Sun, some 13,000 asteroids pass close by. Known as Near-Earth Objects (NEOs), these asteroids are more than just a heavenly curiosity; they are treasures. The resources contained within them mean they have the potential to provide untold riches, the future oil fields of space. The question is, would it be worth it? Some might ask whether it’s realistic to stage such a seemingly out-of-this-world plan. Those involved in the nascent asteroid mining industry, however, argue that there are a number of misconceptions about their efforts.

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