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- 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
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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 the present time; the electromagnetic radiation See more
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 moreThe most distant astronomical object identified (as of September of 2022) is a galaxy classified as JADES-GS-z13-0. In 2009, a See more
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 on the grounds that we can never know … 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 … See more
Wikipedia text under CC-BY-SA license Observable universe | Definition, Size, Description,
WEB6 days ago · Karen Sottosanti. 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 …
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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 13.75 ...
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WEBOct 15, 2021 · The exact size of the whole universe is unknown, but estimates put it at around 23 trillion light-years in diameter. Other cosmologists say that the whole universe may simply be infinite.
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