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- Outer_space abstract "Outer space, or simply space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles: predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation (from the theorized Big Bang), is 2.7 kelvin (K). Plasma with a density of less than one hydrogen atom per cubic meter and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. In 1979, the Moon Treaty made the surfaces of objects such as planets, as well as the orbital space around these bodies, the jurisdiction of the international community. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Unfortunately, due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon. In August 2012, Voyager 1 became the first man-made satellite to enter interstellar space.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to solving all of these health and environmental issues, humans will also need to find a way to significantly reduce the cost of getting into space if they want to become a space faring civilization. Proposed concepts for doing this are Non-rocket spacelaunch, Skyhooks, and Space elevators.".
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- Outer_space wikiPageExternalLink Apollo_08a_Summary.htm.
- Outer_space wikiPageExternalLink space.com.
- Outer_space wikiPageExternalLink www.newscientistspace.com.
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- Outer_space wikiPageID "177602".
- Outer_space wikiPageRevisionID "605107433".
- Outer_space hasPhotoCollection Outer_space.
- Outer_space subject Category:Environments.
- Outer_space subject Category:Extragalactic_astronomy.
- Outer_space subject Category:Intergalactic_media.
- Outer_space subject Category:Large-scale_structure_of_the_cosmos.
- Outer_space subject Category:Outer_space.
- Outer_space subject Category:Space_plasmas.
- Outer_space subject Category:Vacuum.
- Outer_space comment "Outer space, or simply space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles: predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation (from the theorized Big Bang), is 2.7 kelvin (K).".
- Outer_space label "Espace (cosmologie)".
- Outer_space label "Espacio exterior".
- Outer_space label "Espaço sideral".
- Outer_space label "Extraterrestrisch".
- Outer_space label "Outer space".
- Outer_space label "Przestrzeń kosmiczna".
- Outer_space label "Ruimte (astronomie)".
- Outer_space label "Spazio (astronomia)".
- Outer_space label "Космическое пространство".
- Outer_space label "فضاء خارجي".
- Outer_space label "外层空间".
- Outer_space label "宇宙空間".
- Outer_space sameAs Kosmický_prostor.
- Outer_space sameAs Extraterrestrisch.
- Outer_space sameAs Διάστημα.
- Outer_space sameAs Espacio_exterior.
- Outer_space sameAs Kanpo-espazio.
- Outer_space sameAs Espace_(cosmologie).
- Outer_space sameAs Luar_angkasa.
- Outer_space sameAs Spazio_(astronomia).
- Outer_space sameAs 宇宙空間.
- Outer_space sameAs 우주_공간.
- Outer_space sameAs Ruimte_(astronomie).
- Outer_space sameAs Przestrzeń_kosmiczna.
- Outer_space sameAs Espaço_sideral.
- Outer_space sameAs m.01833w.
- Outer_space sameAs Mx4rvVjSdZwpEbGdrcN5Y29ycA.
- Outer_space sameAs Q4169.
- Outer_space sameAs Q4169.
- Outer_space wasDerivedFrom Outer_space?oldid=605107433.
- Outer_space depiction 1000px-Atmosphere_layers-en.PNG.
- Outer_space isPrimaryTopicOf Outer_space.