According to the theory of cosmic inflation, the entire universe’s size is at least 10^23 times larger than the size of the observable universe. How can the universe be 93 billion light-years across if it is only 13.8 billion years old?
The observable universe is, non-helpfully, the region of the universe that we can observe.
“In contemporary cosmology, it is agreed the universe underwent a period of rapid inflation producing a vast region of expansion beyond the horizon of what we can directly observe. e.g. In an accelerating universe the observable universe actually keeps getting smaller, because the past keeps disappearing by redshift. The observable universe is a spherical 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, because electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.
we know there is nothing outside of the observable universe that we should be able to see? The universe (Latin: universus) is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light-years in diameter.
Ultimately, understanding this facet of physics is the key to understanding what lies beyond the edge of the observable universe and whether we … .
Light hasn’t had enough time to travel that far…? An object is observable if the light from an object (or, more accurately, an event) has had enough time to reach YOU. i.e. So, what makes something observable? What exists between Earth and the red-shifted galaxies at the edge of our visible universe is more or less a constant of galaxies and stars, with occasional voids and superclusters of galaxies; We can look in any direction and see pretty much the same thing, everywhere. “However, there is more to the universe than the observable,” said Totani. The observable universe is all we can ever see and nothing beyond it matters BY DEFINITION.
Or does "observable universe" mean what we are able to see in its entirety?
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