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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 telescopes and exploratory probes at … 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 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

    Overview image
    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 Earth or space-based instruments, and therefore lie outside the … 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 more

    The most distant astronomical object identified (as of August of 2024) is a galaxy classified as JADES-GS-z14-0. 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

     
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  5. Observable universe | Definition, Size, Description,

    WEBAug 21, 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, is …

  6. Difference between the observable universe and the whole …

  7. How can the visible universe be 46 billion light-years …

    WEBJun 12, 2024 · This expansion explains how a 13.8-billion-year-old universe can be so much larger than 13.8 billion light-years across. First of all, we should explain that the light-speed limit that relativity...

  8. Observable vs. Entire Universe | Overview, Size & Difference

  9. Defining and measuring the observable universe and the whole …

  10. 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 …

  11. The Visible Universe, Then and Now - Popular Science

    WEBNov 1, 2011 · Our interactive map shows how the known universe has grown from 1950 to 2011. In the late 1700s, William Herschel, an English astronomer using a telescope with an 18.7-inch aperture, made the...

  12. APOD: 2018 May 8 - The Observable Universe

    WEBThe featured image illustrates the observable universe on an increasingly compact scale, with the Earth and Sun at the center surrounded by our Solar System, nearby stars, nearby galaxies, distant galaxies, filaments …

  13. How large is the observable universe? | NOVA | PBS

    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 ...

  14. Why is the observable Universe larger than its age would suggest?

  15. How big is the universe? | Space

  16. Observable Universe VS Actual Universe - YouTube

  17. The observable Universe and beyond - BBC News

  18. Ask Ethan: How Large Is The Entire, Unobservable Universe?

  19. Ask Astro: How much of the universe can we observe?

  20. The Observable Universe | What is the Visible Universe? - abdatum

  21. Why is the observable universe so big? - Physics Stack Exchange

  22. Is it better to define the observable universe as the universe?

  23. NASA – Hubble Digs Deeply, Toward Big Bang - Science@NASA

  24. Could the observable universe be bigger than the universe?

  25. APOD: 2022 March 16 - The Observable Universe

  26. Universe Could be 250 Times Bigger Than What is Observable