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- Universe - Wikipedia
The portion of the universe that can be seen by humans is approximately 93 billion light-years in diameter at present, but the total size of the universe is not known [3] Some of the earliest cosmological models of the universe were geocentric, placing Earth at the center
- Observable universe - Wikipedia
The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth; the electromagnetic radiation from these astronomical objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion
- Universe - Simple English Wikipedia, the free encyclopedia
Some parts of the universe are expanding even faster than the speed of light This means the light will never be able to reach us here on Earth, so we will never be able to see these parts of the universe We call the part of the universe we can see the observable universe
- Universe | Definition Facts | Britannica
This article traces the development over time of humanity’s perception of the universe, from prehistoric observations of the night sky to modern calculations on the recessional velocity of galaxies For articles on component parts of the universe, see solar system, star, galaxy, and nebula
- Universe - NASA Science
Welcome to the Universe Discover the universe: Learn about the history of the cosmos, what it's made of, and so much more
- Wikipedia, the free encyclopedia
Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation
- What is the Universe? - Science@NASA
The universe is everything It includes all of space, and all the matter and energy that space contains It even includes time itself and, of course, it includes you
- Shape of the universe - Wikipedia
Shape of the observable universe The universe's structure can be examined from two angles: Local geometry: This relates to the curvature of the universe, primarily concerning what we can observe Global geometry: This pertains to the universe's overall shape and structure
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