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The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs) to Earth.
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations. [2][3][4][5] The earliest empirical ...
Hubble's law, also known as the Hubble–Lemaître law, [1] is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving away. For this purpose, the recessional velocity of a galaxy is typically determined by measuring ...
The domain of Lugalzaggesi of Uruk (in orange) c. 2350 BC, one of the first kings to claim universal rule.. During the Early Dynastic Period in Mesopotamia (c. 2900–2350 BC), the rulers of the various city-states (the most prominent being Ur, Uruk, Lagash, Umma and Kish) in the region would often launch invasions into regions and cities far from their own, at most times with negligible ...
When Arthur leaves Zaphod, Ford, and Zarniwoop stranded with the Ruler of the Universe and his cat (at the conclusion of Fit the Twelfth of the radio series), he takes one of the Lintillas with him aboard the Heart of Gold. All Lintillas were played by the same actress: Rula Lenska. Lintilla (and her clones) appeared only in the final three ...
The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. Research published in 2015 estimates the earliest stages of the universe's existence as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68% confidence level. [1]
Andreas Cellarius 's illustration of the Copernican system, from the Harmonia Macrocosmica. Heliocentrism[a] (also known as the heliocentric model) is a superseded astronomical model in which the Earth and planets revolve around the Sun at the centre of the universe. Historically, heliocentrism was opposed to geocentrism, which placed the Earth ...
The universe is all of space and time [a] and their contents. [10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments. Since the early 20th century, the field of ...