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...

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...

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...

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...

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"...

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...

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...

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

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

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...

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...

enhanced. Chary himself is skeptical: Many other regions beyond our observable universe would exist with each such region governed by a different set 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 substructure equivalent to our entire observable universe. Boltzmann argues that, while most of the universe is featureless, humans do not see those...

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...

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

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 observable universe. A related theory by Smoller, Temple, and Vogler proposes that this shockwave may have resulted in our part of the universe having...

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

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...

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...

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

~0.8, and it stretches across roughly 1/15th of the radius of the observable universe. It was discovered using data from the Sloan Digital Sky Survey by...

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

present to about 1014 (100 trillion) years after the Big Bang The observable universe is currently 1.38×1010 (13.8 billion) years old. This time lies within...