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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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Space :: Aerospace and Defense
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looked at very cool office space downtown today. It'll be great to get us all together in one place, soon.
jillprevost (Jill Prevost) Thu, 03 Dec 2009 04:24:44 -0000
looked at very cool office space downtown today. It'll be great to get us all together in one place, soon.
Maybe you should've gone in drag? RT @MeatcakesMcGhee: Went to the child support office today. They looked at me like I was a space alien.
Kickstand22 (Kickstand22) Thu, 03 Dec 2009 04:24:41 -0000
Maybe you should've gone in drag? RT @MeatcakesMcGhee: Went to the child support office today. They looked at me like I was a space alien.
Kiwi Rocket Scares Sheep, Reaches Space http://bit.ly/8K0u3t
justinvincent (Justin Vincent) Thu, 03 Dec 2009 04:24:27 -0000
Kiwi Rocket Scares Sheep, Reaches Space http://bit.ly/8K0u3t
RT @housechick did the tucson branch of thompson's realty just find a home? http://twurl.nl/ujjvzg sweet coworking space! (Love this)
deanouellette (Dean Ouellette) Thu, 03 Dec 2009 04:24:15 -0000
RT @housechick did the tucson branch of thompson's realty just find a home? http://twurl.nl/ujjvzg sweet coworking space! (Love this)
one of these days soon ima sit down and clean out my followers most r just a waste of space bullshit accounts/spam n ish *kanye shrug*
KING_MO (أبلغت كامبوس) Thu, 03 Dec 2009 04:24:14 -0000
one of these days soon ima sit down and clean out my followers most r just a waste of space bullshit accounts/spam n ish *kanye shrug*
@iamdiddy Keep your head up... I'm in the same space man. You can't see the sun come out tomorrow if you're looking at the ground!
mackburnett (Mack Burnett III) Thu, 03 Dec 2009 04:24:09 -0000
@iamdiddy Keep your head up... I'm in the same space man. You can't see the sun come out tomorrow if you're looking at the ground!

 
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Spaceflight Systems - Looks at the many types of launch vehicles and propulsion technologies that are in service or proposed.

404 Cosmos 1: the first solar sail - The Planetary Society is developing and conducting a privately funded solar sail project with Cosmos Studios. The spacecraft will be developed, launched and operated in Russia.

Earth-to-Orbit Transportation Bibliography - A look at the various propulsion technologies that could be used to provide cheap transport into orbit.

How Space Exploration Will Work - Illustrated narrative shows a number of advanced space concepts.
Meta Description: [ HowStuffWorks explains hundreds of subjects, from car engines to lock-picking to ESP, using clear language and tons of illustrations. We do the research so you don't have to. ]

Interstellar Missions - News on advanced propulsion technologies for space travel from universtites, organisations and companies.
Meta Description: [ , A news web site featuring breakthroughs in propulsion physics that will enable missions beyond the solar system ]

Solar-Thruster-Sailor - Solar Sail with hybrid propulsion, using light pressure and ion thruster to produce thrust. Spacecraft Building System to build large, light weight space structures in a fast and simple way.
Meta Description: [ Index-Page of STS, the Solar-Thruster-Sailor Site, featuring gigantic flying saucer cup like ring structures (RSS), using (carbon or CNT fiber) pipes, threads and belts to set up Solar-Thruster-Sails, Gyroscopic Experimental Flying Objects, Rotational Slingshot Catapults and other Thruster Ring s... ]

Swiss Propulsion Laboratory - Aims to develop systems to transport small civilian payloads into a low-earth orbit (LEO).

The Sunflower Project - A proposed space transportation system which consists of two parts: rotocrane moving in an atmosphere only, and sunflower moving in a space plasma. Description of the theory and state of development.

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