COSMOGONY (or COSMOGENY) is any model concerning the origin of either the cosmos or universe . Developing a complete theoretical model has implications in both the philosophy of science and epistemology .
* 1 Etymology * 2 Overview * 3 Compared with cosmology * 4 Theoretical scenarios * 5 See also * 6 References
The word comes from the Koine Greek κοσμογονία (from κόσμος "cosmos , the world") and the root of γί(γ)νομαι / γέγονα ("come into a new state of being"). In astronomy , cosmogony refers to the study of the origin of particular astrophysical objects or systems, and is most commonly used in reference to the origin of the Universe, the Solar System, or the Earth–Moon system.
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COSMIC EXPANSION EARLIEST LIGHT COSMIC SPEED-UP SOLAR SYSTEM
WATER SINGLE-CELLED LIFE PHOTOSYNTHESIS Multicellular
life LAND LIFE EARLIEST GRAVITY DARK ENERGY DARK MATTER
← Earliest universe (−13.80 ) ← Earliest galaxy
← Earliest quasar ←
Omega Centauri forms ← Andromeda
Galaxy forms ← Milky Way Galaxy
spiral arms form ←
Alpha Centauri forms ← Earliest
Earth (−4.54 ) ← Earliest life ← Earliest oxygen
← Atmospheric oxygen ← Earliest sexual reproduction ←
The Big Bang theory is the prevailing cosmological model of the early development of the universe . The most commonly held view is that the universe was once a gravitational singularity , which expanded extremely rapidly from its hot and dense state. However, while this expansion is well-modeled by the Big Bang theory , the origins of the singularity remain as one of the unsolved problems in physics . Projection of a Calabi–Yau manifold from string theory . In quantum physics, there remain different, plausible theories regarding what combination of "stuff", space, or time emerged along with the singularity (and therefore this universe). The main disagreement among theories is whether time existed "before" the emergence of our universe or not.
Cosmologist and science communicator
Sean M. Carroll explains two
competing types of explanations for the origins of the singularity
which is the main disagreement between the scientists who study
cosmogony and centers on the question of whether time existed "before"
the emergence of our universe or not. One cosmogonical view sees time
as fundamental and even eternal: The universe could have contained the
singularity because the universe evolved or changed from a prior state
(the prior state was "empty space", or maybe a state that could not be
called "space" at all). The other view, held by proponents like
One problem in cosmogony is that there is currently no theoretical model that explains the earliest moments of the universe's existence (during the Planck time ) because of a lack of a testable theory of quantum gravity . Researchers in string theory and its extensions (for example, M theory ), and of loop quantum cosmology , have nevertheless proposed solutions of the type just discussed.
Another issue facing the field of particle physics is a need for more expensive and technologically advanced particle accelerators to test proposed theories (for example, that the universe was caused by colliding membranes ).
COMPARED WITH COSMOLOGY
Cosmology is the study of the structure and changes in the present universe, while the scientific field of cosmogony is concerned with the origin of the universe. Observations about our present universe may not only allow predictions to be made about the future, but they also provide clues to events that happened long ago when ... the cosmos began. So the work of cosmologists and cosmogonists overlaps.
Cosmogonists have only tentative theories for the early stages of the universe and its beginning. As of 2011 , no accelerator experiments probe energies of sufficient magnitude to provide any experimental insight into the behavior of matter at the energy levels that prevailed shortly after the Big Bang . Furthermore, since astronomical observations imply a singularity at the origin of the universe, experiments at any given high energy level will always be dwarfed by the infinite energy level predicted by Big Bang Theory. Therefore, significant technological and conceptual advances would be needed to propose a scientific test for cosmogonical theories.
Proposed theoretical scenarios differ radically, and include string
* ^ A B Ridpath, Ian (2012). A Dictionary of Astronomy. Oxford
* ^ A B Woolfson, M.M. (1979). "
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