The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth; the electromagnetic radiation...

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

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

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

Milky Way, which is one of a few hundred billion galaxies in the observable universe. Many of the stars in a galaxy have planets. At the largest scale...

When the size of the universe at Big Bang is described, it refers to the size of the observable universe, and not the entire universe. Another common misconception...

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...

scales, that the universe is eternal rather than bounded in time by the Big Bang, and that the expansion of the observable universe is caused by annihilation...

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

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

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

a principle that says that the observable universe is always the same at any time and any place. A static universe, where space is not expanding, also...

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...

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...

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

of the universe" to mean the duration of the Lambda-CDM expansion, or equivalently, the time elapsed within the currently observable universe since the...

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...

physical entity, association, or structure that exists within the observable universe. In astronomy, the terms object and body are often used interchangeably...

eventual end of all matter in the universe. All projections of the future of Earth, the Solar System and the universe must account for the second law of...

known structure in the observable universe, measuring approximately 10 billion light-years in length (the observable universe is about 93 billion light-years...

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

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"...

22%2C+%22M%22%7D+-%3E%2210*solar+mass%22 Fermi estimate: Mass of observable universe / mass of Milky Way ≈ 1e+12. Number of stars in the Milky Way ≈ 1e+11...

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

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

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...

a substructure equivalent to our entire observable universe. Boltzmann argues that, while most of the universe is featureless, humans do not see those...

context, the size of the observable universe is currently about 46 billion light years in all directions from earth. The universe is thought to be that size...

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...