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The expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it.
Space launch vehicle imagined on a Gobelins tapestry, ordered by Colbert and drawn by Le Brun, 1664.. Space travel has long been a significant ambition in French culture.From the Gobelins' 1664 tapestry representing a space rocket, [1] to Jules Verne's 1865 novel From the Earth to the Moon and George Méliès' 1902 film A Trip to the Moon, space and rocketry were present in French society long ...
Timeline of the expansion of the universe, where space, including hypothetical non-observable portions of the universe, is represented at each time by the circular sections. On the left, the dramatic expansion occurs in the inflationary epoch; and at the center, the expansion accelerates (artist's concept; neither time nor size are to scale).
In physical cosmology, cosmic inflation, cosmological inflation, or just inflation, is a theory of exponential expansion of space in the very early universe.Following the inflationary period, the universe continued to expand, but at a slower rate.
The term outward space existed in a poem from 1842 by the English poet Lady Emmeline Stuart-Wortley called "The Maiden of Moscow", [13] but in astronomy the term outer space found its application for the first time in 1845 by Alexander von Humboldt. [14] The term was eventually popularized through the writings of H. G. Wells after 1901. [15]
If dark energy—represented by the cosmological constant, a constant energy density filling space homogeneously, [3] or scalar fields, such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space—accelerates the expansion of the universe, then the space between clusters of galaxies will grow at an ...
According to the theory of cosmic inflation, the very early universe underwent a period of very rapid, quasi-exponential expansion.While the time-scale for this period of expansion was far shorter than that of the existing expansion, this was a period of accelerated expansion with some similarities to the current epoch.
Space colonization has been in a broad sense referred to as space settlement, space humanization or space habitation. [16] Space colonization in a narrow sense refers to space settlements, as envisioned by Gerard K. O'Neill. [17] It is characterized by elements such as: settlement and exploitation, [18] as well as territorial claim. [19]