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Observable universe - Wikipedia
The light-travel distance to the edge of the observable universe is the age of the universe times the speed of light, 13.8 billion light years. This is the distance that a photon emitted shortly after the Big Bang, such as one from the cosmic microwave background , has traveled to reach observers on Earth. See more
The comoving distance from Earth to the edge of the observable universe is about 14.26 gigaparsecs (46.5 billion light-years or 4.40×10 m) in any direction. The observable universe … See more
Sky surveys and mappings of the various wavelength bands of electromagnetic radiation (in particular 21-cm emission) have yielded much … See more
Both popular and professional research articles in cosmology often use the term "universe" to mean "observable universe". This can be justified on the grounds that we can never know anything by direct observation about any part of the universe that is See more
Number of galaxies and stars
The observable universe contains as many as an estimated 2 trillion galaxies and, overall, as many … See moreThe most distant astronomical object identified (as of September of 2022) is a galaxy classified as JADES-GS-z13-0. In 2009, a gamma ray burst, GRB 090423, was found to have a redshift of 8.2, which indicates that the collapsing star that caused it, exploded … See more
Wikipedia text under CC-BY-SA license Observable universe | Definition, Size, Description,
WEBAug 21, 2024 · The observable universe is approximately 93 billion light-years in diameter. This number is derived from several considerations. A light-year, the distance light can travel in one Earth year, is 9.46 trillion …
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The mystery of how big our Universe really is - BBC
WEBWhen we look in any direction, the furthest visible regions of the Universe are estimated to be around 46 billion light years away. That's a diameter of 540 sextillion (or 54 followed by 22...
The Observable Universe is 880 yottameters - Scale of Universe
How large is the observable universe? | NOVA | PBS
WEBOct 10, 2012 · From the time of the Big Bang to the era of recombination (when neutral hydrogen atoms formed) some 380,000 years later, the universe was opaque to light.
APOD: 2022 March 16 - The Observable Universe
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