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  1. Observable universe - Wikipedia

    • 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 Earth or space-based i… See more

    "The Universe" Versus "The Observable Universe"

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

    Wikipedia
    Size

    The comoving distance from Earth to the edge of the observable universe is about 14.26 … See more

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    Matter and Mass

    Number of galaxies and stars
    The observable universe contains as many as an estimated 2 trillion galaxies and, overall, as many as an estimated 1024 stars – mor… See more

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    Large-Scale Structure

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

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  2. The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.
    en.wikipedia.org/wiki/Observable_universe
    Today the universe has expanded into an age and size that is physically only in parts observable as the observable universe, which is approximately 93 billion light-years in diameter at the present day, while the spatial size, if any, of the entire universe is unknown.
    en.wikipedia.org/wiki/Universe
     
  3. People also ask
    What is observable universe?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 its centre, is differentiated from the entirety of the universe, which is the whole cosmic system of
    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 ).
    What can you see in the observable universe?Everything you can see, and everything you could possibly see, right now, assuming your eyes could detect all types of radiations around you -- is the observable universe. In light, the farthest we can see comes from the cosmic microwave background, a time 13.8 billion years ago when the universe was opaque like thick fog.
    Can scientists see beyond the observable universe?Scientists can only see so far before they run into the edge of the universe. Will we ever know if anything lies beyond? This image shows the cosmic microwave background—the oldest light in the universe, released shortly after the big bang. This barrier marks the edge of the observable universe, though scientist...Read More ---
    How many stars are in the observable universe?The observable universe contains as many as an estimated 2 trillion galaxies and, overall, as many as an estimated 10 24 stars – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth.
    Is the observable universe bigger than the whole universe?So let's just say that the observable universe is stupendously big, but the whole universe, as far as we can tell, is a lot bigger. Space is most likely infinite, or at least it doesn't have an edge, though the difference between those is another story unto itself. Now, what about the center of the universe?
     
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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 its centre, …

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  7. Universe - Wikipedia

    WEBToday the universe has expanded into an age and size that is physically only in parts observable as the observable universe, which is approximately 93 billion light-years in diameter at the present day, while …

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