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Space has been an interest for philosophers and scientists for much of human history, and hence it is difficult to provide an uncontroversial and clear definition outside of specific defined contexts. Disagreement exists on whether space itself can be measured or is part of the measuring system. (See Space in philosophy.) The term is also used somewhat differently in different fields of study. Many fields use an operational definition in which the units of measurement are defined.
Mathematical spaces
In mathematics, a space is a set, with some particular properties and usually some additional structure. It is not a formally defined concept as such, but a generic name for a number of similar concepts, most of which generalize some abstract properties of the physical concept of space.
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Applications in Space :: Nuclear
A Scientific Critique of the Accident Risks from the Cassini Space Mission - Article by Dr. Michio Kaku.
Meta Description: [ A Scientific Critique of the Accident Risks from the Cassini Space Mission by Dr. Michio Kaku ]
Federation of American Scientists Space Nuclear Propulsion - Information resources on space nuclear propulsion, space policy and other nuclear related topics.
Nukes Are Necessary in Space - Time magazine column by Leon Jaroff reports that activists are up in arms over a proposal to allow nuclear reactors in spacecraft, and says they're greatly overestimating the risks.
Meta Description: [ Activists are up in arms over a Bush proposal to allow nuclear reactors in spacecraft. They're greatly overestimating the risks ]
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Nukes in Space: The Final Frontier? - Article arguing that plutoniom is too dangerous and NASA need not risk a nuclear accident by using nuclear powered probes. From Awareness Magazine.
Space Nukes - Personal opinion regarding the launch of a space probe that contains plutonium.
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