Editing Observable universe (section)

== Horizons ==
{{Main|Cosmological horizon}}
The limit of observability in the universe is set by cosmological horizons which limit—based on various physical constraints—the extent to which information can be obtained about various events in the universe. The most famous horizon is the [[particle horizon]] which sets a limit on the precise distance that can be seen due to the finite [[age of the universe]]. Additional horizons are associated with the possible future extent of observations, larger than the particle horizon owing to the [[expansion of space]], an "optical horizon" at the [[Cosmic microwave background|surface of last scattering]], and associated horizons with the surface of last scattering for [[cosmic neutrino background|neutrinos]] and [[gravitational wave background|gravitational waves]].
{{multiple image
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 | header_background =
 | header_align      = center
 | header            = [[Location of Earth]] in the [[Universe]]
 | image1            = The Earth seen from Apollo 17.jpg
 | width1            = 82
 | caption1          = [[Earth]]
 | image2            = Solar System true color.jpg
 | width2            = 146
 | caption2          = [[Solar&nbsp;System]]
 | image3            = Galaxymap.com, map 1000 parsecs (2022).png
 | width3            = 82
 | caption3          = [[Molecular cloud]]s around the Sun inside the [[Orion-Cygnus Arm]]
 | image4            = Milky Way Arms ssc2008-10.svg
 | width4            = 93
 | caption4          = [[Orion Arm]]
 | image5            = Artist's impression of the Milky Way (updated - annotated).jpg
 | width5            = 83
 | caption5          = [[Milky&nbsp;Way]]
 | image6            = Local Group and nearest galaxies.jpg
 | width6            = 111
 | caption6          = [[Local Group|Local&nbsp;Group]]
 | image7            = Local supercluster-ly.jpg
 | width7            = 86
 | caption7          = [[Virgo Supercluster|Virgo SCl]]
 | image8            = Observable universe r2.jpg
 | width8            = 83
 | caption8          = [[Laniakea Supercluster|Laniakea SCl]]
 | image9            = Observable Universe with Measurements 01.png
 | width9            = 83
 | caption9          = Our&nbsp;Universe
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}}
{{wide image|Location of Earth (9x1-English Annot-small).png|2250px|A diagram of the Earth's location in the observable universe. (''[[:File:Location of Earth (3x3-English Annot-small).png|Alternative image]].'')}}

{{wide image|Observable_Universe_Logarithmic_Map_(horizontal_layout_english_annotations).png|2250px|A logarithmic map of the observable universe. From left to right, spacecraft and celestial bodies are arranged according to their proximity to the Earth.}}