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  2. In physics, we usually distinguish between these two notions of universe as, one, the observable universe, which is everything whose existence we've thus far been able to confirm or observe, or could, in principle, observe if we pointed our telescopes at it, and two, the Universe with a capital U, or the whole universe, which is everything that exists, has existed, or will exist, anytime, anywhere, regardless of whether or not we are aware of it yet or ever will be.
    www.britannica.com/video/185559/lesson-universe-distinction
    www.britannica.com/video/185559/lesson-universe-distinction
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    Observable universe - Wikipedia

    Sometimes astrophysicists distinguish between the observable universe and the visible universe. The former includes signals since the end of the inflationary epoch, while the latter includes only signals emitted since recombination. 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

    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 … 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 redshift of 8.2, which indicates that the collapsing star that caused it exploded … 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 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

    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

    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

     
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  5. Observable universe | Definition, Size, Description,

    WEBMay 20, 2024 · Observable universe, the region of space that humans can actually or theoretically observe with the aid of technology. The observable universe, which can be thought of as a bubble with Earth at …

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    WEBOct 10, 2012 · Multiple the two figures and—voilà—we find that over the entire history of the universe, light could have travelled 13.75 billion light-years, or 81 billion trillion miles. But, in fact, that ...

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