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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 Flight :: Astronomy and Space
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Geography :: Social Studies
RT @tristan_bethe: 100 epic images from Hubble Space Telescope http://bit.ly/80bXyH ...time to feel tiny again!
dancandido (Dan Candido) Sat, 26 Dec 2009 13:18:40 -0000
RT @tristan_bethe: 100 epic images from Hubble Space Telescope http://bit.ly/80bXyH ...time to feel tiny again!
100 epic images from Hubble Space Telescope http://bit.ly/80bXyH ...time to feel tiny again!
tristan_bethe (tristan_bethe) Sat, 26 Dec 2009 13:13:37 -0000
100 epic images from Hubble Space Telescope http://bit.ly/80bXyH ...time to feel tiny again!
new on the blog Glorious: Some mind-blowing images from the Hubble Space Telescope. More at the Hubble Advent Calen... http://bit.ly/8ARGfE
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Earth As Art - Images taken by orbitting satellites show geographical features in unexpected ways. Some can be downloaded as screensavers.
Earth at Night - A photograph made from several views of the whole world, showing city lights and areas of greater population. From NASA's Astronomy Picture of the Day series.
Earth Cam - A real-time satellite view, where the visible-light image is updated every 3 hours.
Meta Description: [ SPACE.com Cam: Earth Cam shows real-time satellite view of Earth ]
Earth From Space - A collection of photographs taken from various spacecraft, as well as captions, and quotations from the astronauts.
Earth Science Photos - Pictures taken from satellites of the Goddard Space Flight Center show hurricanes, fires and melting icecaps. Arranged in date order.
EarthKAM - A NASA sponsored program that provides photographs taken from the Space Shuttle and International Space Station. Explains how select middle schools request images based upon their classroom investigations.
Global Composite Weather Satellite Images - An interactive picture of current weather conditions over the whole earth. Viewers can zoom and enhance the image.
Meta Description: [ Global composite of geostationary satellite
weather images. You may interactively zoom and animate the pictures. ]
Monitoring the Earth from Space - Explains the SeaWiFS project by NASA, which uses satellites to learn about the condition of the oceans. Includes digital and colour images, with examples of the way the information is used.
Meta Description: [ Information about the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ]
Observing the Earth - Features the latest news on missions and satellites of the European Space Agency, with images and animations from previous journeys.
Meta Description: [ ESA Observing the Earth homepage, features the latest news on Earth observation missions and satellites, including ERS 1, ERS 2, Envisat, Metop, Meteosat and Living Planet. ]
The Gateway to Astronaut Photography of Earth - A searchable collection of pictures taken from 1961 to the present, with captions and background information.
Meta Description: [ The Gateway to Astronaut Photography of Earth hosts the best and most complete online collection of astronaut photographs of the Earth. ]
Visible Earth - A searchable collection of NASA photographs and animations, grouped according to location, land use and environmental issues.
Meta Description: [ NASA's Visible Earth catalog of NASA images and animations of our home planet ]
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