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.
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.
More on [ Space ]
Nuclear :: Space
Unmanned :: Missions
Radioactive Power Sources in Space :: Nuclear

INSPI - Innovative Nuclear Space Power and Propulsion Institute - Institute of the University of Florida conducting research in space nuclear energy systems, high temperature nuclear fuels and propulsion. Includes research information, nuclear data and location.
Nuclear Thermal Propulsion - Information resources on space nuclear propulsion, space policy and other nuclear related topics by the Federation of American Scientists. Includes space policy, technical, strategic defense and space exploration information.
NuclearSpace - Pro-nuclear space movement providing news coverage, editorials and articles about the use of nuclear energy in space research and exploration. Includes message board and discussion forum.
Meta Description: [ NuclearSpace.com - Our Mission: To promote the use of nuclear power in space, to further enhance the manned exploration of our solar system. ]
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Radioisotope Power Systems - The Space and Defense Radioisotope Thermoelectric Generator (RTG) Program of the US Department of Energy (DOE) provides support for radioisotope power source in space applications. Includes program description, technical information, history and publications.
Small-Sized Space Nuclear Power System - Compact power source developed at the Kurchatov Institute around a nuclear reactor and a thermionic heat-to-electricity converter for space power systems applications. Includes technical characteristics and contact information.
Space Exploration Nuclear Propulsion - Discusses the scientific aspects of nuclear propulsion in space. Includes technical concepts, technology basics with schematic diagrams, history and topical interviews with scientists and astronauts.
Meta Description: [ A tutorial on zero-g aka microgravity and why it is not zero gravity. ]
UIC: Nuclear Reactors for Space - Briefing paper from the Uranium Information Center (UIC) addressing the different applications of fission reactors and decay heat sources used in space so far.
Will Nuclear Power Put Humans On Mars - Article on the history and possible future applications of nuclear power in space.
Meta Description: [ How do you get humans to Mars quickly, efficiently and on budget? Mission planners are considering a 30-year-old and controversial technology: nuclear rockets. ]
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