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- Observable_universe abstract "The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth in the present day because light and other signals from those objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer, regardless of the shape of the universe as a whole[citation needed]. Every location in the universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2013 is 13.798 ± 0.037 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 billion parsecs (93 billion light-years), putting the edge of the observable universe at about 46–47 billion light-years away.".
- Observable_universe thumbnail HubbleUltraDeepFieldwithScaleComparison.jpg?width=300.
- Observable_universe wikiPageExternalLink apod.nasa.gov.
- Observable_universe wikiPageExternalLink ap071107.html.
- Observable_universe wikiPageExternalLink 1306.0091.
- Observable_universe wikiPageExternalLink 0305179.
- Observable_universe wikiPageExternalLink cosmography.
- Observable_universe wikiPageExternalLink ned.ipac.caltech.edu.
- Observable_universe wikiPageExternalLink index.html.
- Observable_universe wikiPageExternalLink universe.
- Observable_universe wikiPageExternalLink Dltt_is_Dumb.html.
- Observable_universe wikiPageExternalLink cosmology_faq.html.
- Observable_universe wikiPageExternalLink universe.html.
- Observable_universe wikiPageExternalLink stars.survey.
- Observable_universe wikiPageExternalLink millennium.
- Observable_universe wikiPageExternalLink 2dFGRS.
- Observable_universe wikiPageExternalLink imagegallery.
- Observable_universe wikiPageExternalLink horizon.html.
- Observable_universe wikiPageExternalLink An.
- Observable_universe wikiPageExternalLink 070419125240.htm.
- Observable_universe wikiPageExternalLink watch?v=17jymDn0W6U.
- Observable_universe wikiPageExternalLink watch?v=K8V8Iy9Tozk.
- Observable_universe wikiPageID "251399".
- Observable_universe wikiPageRevisionID "606400034".
- Observable_universe hasPhotoCollection Observable_universe.
- Observable_universe subject Category:Physical_cosmology.
- Observable_universe subject Category:Universe.
- Observable_universe comment "The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth in the present day because light and other signals from those objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction.".
- Observable_universe label "Beobachtbares Universum".
- Observable_universe label "Observable universe".
- Observable_universe label "Univers observable".
- Observable_universe label "Universo observable".
- Observable_universe label "Universo observável".
- Observable_universe label "Universo osservabile".
- Observable_universe label "Waarneembaar heelal".
- Observable_universe label "Widzialny Wszechświat".
- Observable_universe label "Метагалактика".
- Observable_universe label "كون منظور".
- Observable_universe label "可觀測宇宙".
- Observable_universe label "観測可能な宇宙".
- Observable_universe sameAs Pozorovatelný_vesmír.
- Observable_universe sameAs Beobachtbares_Universum.
- Observable_universe sameAs Universo_observable.
- Observable_universe sameAs Univers_observable.
- Observable_universe sameAs Alam_semesta_teramati.
- Observable_universe sameAs Universo_osservabile.
- Observable_universe sameAs 観測可能な宇宙.
- Observable_universe sameAs 관측_가능한_우주.
- Observable_universe sameAs Waarneembaar_heelal.
- Observable_universe sameAs Widzialny_Wszechświat.
- Observable_universe sameAs Universo_observável.
- Observable_universe sameAs m.01l9tw.
- Observable_universe sameAs Q221392.
- Observable_universe sameAs Q221392.
- Observable_universe wasDerivedFrom Observable_universe?oldid=606400034.
- Observable_universe depiction HubbleUltraDeepFieldwithScaleComparison.jpg.
- Observable_universe isPrimaryTopicOf Observable_universe.