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The comoving distance from Earth to the edge of the observable universe is about 14.26 gigaparsecs (46.5 billion light-years or 4.40 × 10 26 m) in any direction. The observable universe is thus a sphere with a diameter of about 28.5 gigaparsecs [27] (93 billion light-years or 8.8 × 10 26 m). [28]
It represents the boundary between the observable and the unobservable 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 simply the age of the universe times the speed of light, as in the Hubble horizon, but rather the speed of light ...
The life principle: There is an underlying principle that constrains the Universe to evolve towards life and mind. The self-explaining universe: A closed explanatory or causal loop: "perhaps only universes with a capacity for consciousness can exist". This is Wheeler's participatory anthropic principle (PAP). The fake universe: Humans live ...
Based on observations from the Hubble Space Telescope, there are nearly 2 trillion galaxies in the observable universe. [39] It is estimated that at least ten percent of all Sun-like stars have a system of planets, [40] i.e. there are 6.25 × 10 18 stars with planets orbiting them in the observable universe. Even if it is assumed that only one ...
In “The Secret Life of the Universe: An Astrobiologist's Search for the Origins and Frontiers of Life,” readers won't walk away with a clear-cut answer to that question.
The spatial region from which we can receive light is called the observable universe. The proper distance (measured at a fixed time) between Earth and the edge of the observable universe is 46 billion light-years [49] [50] (14 billion parsecs), making the diameter of the observable universe about 93 billion light-years (28 billion parsecs). [49]
An expanding universe typically has a finite age. Light, and other particles, can have propagated only a finite distance. The comoving distance that such particles can have covered over the age of the universe is known as the particle horizon, and the region of the universe that lies within our particle horizon is known as the observable universe.
Hence, it is unclear whether the observable universe matches the entire universe or is significantly smaller, though it is generally accepted that the universe is larger than the observable universe. The universe may be compact in some dimensions and not in others, similar to how a cuboid [citation needed] is longer in one dimension than the ...