Cosmology is the scientific study of the universe as a unified whole, from its earliest moments through its evolution to its ultimate fate. The currently accepted cosmological model is the big bang. In this picture, the expansion of the universe started in an intense explosion 13.8 billion years ago. In this primordial fireball, the temperature exceeded one trillion K, and most of the energy was in the form of radiation. As the expansion proceeded (accompanied by cooling), the role of the radiation diminished, and other physical processes dominated in turn. Thus, after about three minutes, the temperature had dropped to the one-billion-K range, making it possible for nuclear reactions of protons to take place and produce nuclei of deuterium and helium. (At the higher temperatures that prevailed earlier, these nuclei would have been promptly disrupted by high-energy photons.) With further expansion, the time between nuclear collisions had increased and the proportion of deuterium and helium nuclei had stabilized. After a few hundred thousand years, the temperature must have dropped sufficiently for electrons to remain attached to nuclei to constitute atoms. Galaxies are thought to have begun forming after a few million years, but this stage is very poorly understood. Star formation probably started much later, after at least a billion years, and the process continues today.
Relevant phenomena include
Supernova explosions
Gamma ray bursts
This action is not available. Astronomy studies celestial objects and phenomena and combines mathematics
Physics
And chemistry to explain their origin and evolution. Objects of interest include
Cosmology is a branch of astronomy concerned with the studies of the origin and evolution of the universe
From the Big Bang to today and on into the future. It is the scientific study of the origin
Evolution
And eventual fate of the universe. Thumbnail:Note the two smaller eruptions before the big one.
These are the questions addressed by cosmology
The study of the universe as a whole. Research in cosmology involves astronomy
But also gravitational physics
Particle physics
And challenging questions about the interpretation of phenomena we can’t see directly — such as :
The possible existence of something before the Big Bang.
Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. Cosmology is a branch of astronomy concerned with the studies of the origin and evolution of the universe, from the Big Bang to today and on into the future.
Cosmology is a branch of astronomy that involves the origin and evolution of the universe, from the Big Bang to today and on into the future. According to NASA, the definition of cosmology is "the scientific study of the large scale properties of the universe as a whole."
The currently accepted cosmological model is the big bang. In this picture, the expansion of the universe started in an intense explosion 13.8 billion years ago. In this primordial fireball, the temperature exceeded one trillion K, and most of the energy was in the form of radiation.
Division of Airbus SE
Airbus Defense and Space is the division of Airbus SE responsible for the development and manufacturing of the corporation's defense and space products
While also providing related services.The division was formed in January 2014 during the corporate restructuring of European Aeronautic Defense and Space (EADS)
And comprises the former Airbus Military
Astrium and Cassidian divisions.It is the world's second-largest space company after Boeing and one of the top ten defense companies in the world.
List of definitions of terms and concepts commonly used in the study of astronomy
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology
Their sub-disciplinesAnd related fields.Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth.The field of astronomy features an extensive vocabulary and a significant amount of jargon.
Study of the origin of the universe (structure and evolution)
Observational cosmology is the study of the structure
The evolution and the origin of the universe through observation
Using instruments such as :
Telescopes and cosmic ray detectors.
Branch of cosmology which studies mathematical models of the universe
Physical cosmology is a branch of cosmology concerned with the study of cosmological models.A cosmological model
Or simply cosmology
Provides a description of the largest-scale structures and dynamics of the universe and allows study of fundamental questions about its origin
And ultimate fate.Cosmology as a science originated with the Copernican principle
Which implies that celestial bodies obey identical physical laws to those on Earth
And Newtonian mechanicsWhich first allowed those physical laws to be understood.
Timeline of theories about physical cosmology
This timeline of cosmological theories and discoveries is a chronological record of the development of humanity's understanding of the cosmos over the last two-plus millennia.Modern cosmological ideas follow the development of the scientific discipline of physical cosmology.
