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...

evidence (WMAP, BOOMERanG, and Planck for example) imply that the observable universe is flat to within a 0.4% margin of error of the curvature density...

and the universe has been expanding ever since. Today the universe has expanded into an age and size that is physically only in parts observable as the...

cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known periods through its subsequent large-scale...

black hole cosmological model) is a cosmological model in which the observable universe is the interior of a black hole. Such models were originally proposed...

The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. It is an intrinsic...

the Universe, there is no particular reference point with which to plot the overall location of the Earth in the universe. Because the observable universe...

that the observable universe becomes limited to local galaxies. There are various scenarios for the far future and ultimate fate of the universe. More exact...

Observable universe – All of space observable from the Earth at the present Observational cosmology – Study of the origin of the universe (structure and...

In physics, an observable is a physical property or physical quantity that can be measured. In classical mechanics, an observable is a real-valued "function"...

there are between 200 billion (2×1011) to 2 trillion galaxies in the observable universe. Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately...

the universe, but even galaxies and star systems consist almost entirely of empty space. Most of the remaining mass-energy in the observable universe is...

causal sphere and sphere of causality is a spherical region of the observable universe surrounding an observer beyond which objects recede from that observer...

space than is available in the known universe. Sagan gave an example that if the entire volume of the observable universe is filled with fine dust particles...

generation of matter in a young universe. The zero energy solution for Minkowski space representing an observable universe, was provided in 2009. In his...

enhanced. Chary himself is skeptical: Many other regions beyond our observable universe would exist with each such region governed by a different set of...

retrieve information. This observable constraint is due to various properties of general relativity, the expanding universe, and the physics of Big Bang...

expanding too rapidly. The observable universe is one causal patch of a much larger unobservable universe; other parts of the Universe cannot communicate with...

physical objects are composed. It constitutes the observable universe. The visible components of the universe are now believed to compose only 4.9 percent...

light-years away and stretches across roughly a 15th of the radius of the observable universe. It was discovered using data from the Sloan Digital Sky Survey by...

by Alan Guth. It defines a realm like the one that contains the observable universe as only one of many inflationary zones. Astrophysicist Jean-Luc Lehners...

astrophysics, the Eddington number, NEdd, is the number of protons in the observable universe. Eddington originally calculated it as about 1.57×1079; current estimates...

the perfect cosmological principle, a principle that says that the observable universe is always the same at any time and any place. From the 1940s to the...

assumptions that would be needed for estimates and suggests that the observable universe has more entropy than previously thought. This is because the analysis...

matter experienced in everyday life) and antibaryonic matter in the observable universe. Neither the standard model of particle physics nor the theory of...

number of Planck volumes in the observable universe. Thus Graham's number cannot be expressed even by physical universe-scale power towers of the form...

larger observable universe of today were filled with sand, it would still only equal 1095 grains. Another 100,000 observable universes filled with sand...

with the study of the chronology of the universe. Physical cosmology is the study of the observable universe's origin, its large-scale structures and dynamics...

regions of the universe, so its distance at the present epoch defines the size of the observable universe. Due to the expansion of the universe, it is not...

Known Universe or known universe may refer to The entire universe The observable universe, the part of the universe that can be observed from Earth Known...