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  2. About 46.6 billion light-years

    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 radius of the observable universe is therefore estimated to be about 46.5 billion light-years.
    Density (of total energy): 9.9×10−27 kg/m³ (equivalent to 6 protons per cubic meter of space)
    Mass (ordinary matter): 1.5×10⁵³ kg
    Volume: 3.566×10⁸⁰ m³
    en.wikipedia.org/wiki/Observable_universe
    en.wikipedia.org/wiki/Observable_universe
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  3. People also ask
    What is the size of the universe?The Universe was filled with matter, antimatter, radiation, and existed in an ultra-hot, ultra-dense, but expanding-and-cooling state. By today, the volume containing our observable Universe has expanded to be 46 billion light years in radius, with the light that's first arriving at our eyes today corresponding to the limit of what we can measure.
    How big is the observable universe?The observable universe is thus a sphere with a diameter of about 28.5 gigaparsecs (93 billion light-years or 8.8 × 10 26 m). Assuming that space is roughly flat (in the sense of being a Euclidean space ), this size corresponds to a comoving volume of about 1.22 × 104 Gpc3 ( 4.22 × 105 Gly3 or 3.57 × 1080 m3 ).
    How many light-years is the observable universe?This means that the observable universe is more than 46 billion light-years in any direction from Earth and about 93 billion light-years in diameter. Given the constant expansion of the universe, the observable universe expands another light-year every Earth year.
    What is the difference between the observable universe and the whole universe?Learn about the distinction between the observable universe and the whole universe. 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 kilometres (5.88 trillion miles).
     
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    Observable universe - Wikipedia

    Number of galaxies and stars The observable universe contains as many as an estimated 2 trillion galaxies and, overall, as many as an estimated 10 stars – more stars (and earth-like planets) than all the grains of beach sand on planet Earth. As mentioned earlier, the estimated number of galaxies was … See more

    The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based … See more

    Size image

    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 … See more

    The 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 See more

    Large-scale structure image
    Overview image

    The universe's size is unknown, and it may be infinite in extent. Some parts of the universe are too far away for the light emitted since the Big Bang to have had enough time to reach … See more

    Both popular and professional research articles in cosmology often use the term "universe" to mean "observable universe". This can be justified … See more

    Sky surveys and mappings of the various wavelength bands of electromagnetic radiation (in particular 21-cm emission) have yielded much information on the content and … See more

    Bolshoi Cosmological Simulation – Computer simulation of the universe
    Causality (physics) – Physics of the cause–effect relation See more

     
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  5. Observable universe | Definition, Size, Description,

    Web3 days ago · 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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    WebOct 10, 2012 · The time that has elapsed since the Big Bang is 13.75 billion years. Multiple the two figures and—voilà—we find that over the entire history of the universe, light could have travelled...

  9. How Big Is the Universe? | NOVA | PBS

    WebNov 11, 2000 · This horizon describes the visible universe—a region some 28 billion light years in diameter. But what are the horizons of a civilization that inhabits the most distant galaxies we see?...

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    WebJul 1, 2019 · Using today’s most powerful telescopes, astronomers see galaxies located over 13 billion light-years from Earth. (A light-year equals about 6 trillion miles, or 10 trillion kilometers.) Since they...

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  13. The Universe within 14 billion Light Years - The Visible …

    WebThe visible universe appears to have a radius of 14 billion light years because the universe is about 14 billion years old. The light from more distant objects simply has not had time to reach us. For this reason …

  14. Defining and measuring the observable universe and …

    WebDoes it have a center? Does it have an edge? Is it getting bigger, and if so, why? Well, we know that there are two different meanings for universe. First, the observable universe is everything that we've been able to see or …

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