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Golden Age Of Cosmology
The ''golden age of cosmology'' is a term often used to describe the period from 1992 to the present in which important advances in observational cosmology have been made. The golden age of cosmology is a term used to describe a period of time that spans from 1992 to the present day. This period marks an era of tremendous progress in the field of observational cosmology, characterized by significant breakthroughs and discoveries that have transformed our understanding of the universe. Prior to the golden age of cosmology, our understanding of the universe was limited to what we could observe through telescopes and other instruments. Theories and models were developed based on limited data and observations, and there was much speculation and debate regarding the true nature of the universe. In 1992, however, the situation changed dramatically with the launch of the Cosmic Background Explorer (COBE) satellite. This mission was designed to study the cosmic microwave background (CMB) r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Observational Cosmology
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. Early observations The science of physical cosmology as it is practiced today had its subject material defined in the years following the Shapley-Curtis debate when it was determined that the universe had a larger scale than the Milky Way galaxy. This was precipitated by observations that established the size and the dynamics of the cosmos that could be explained by Albert Einstein's General Theory of Relativity. In its infancy, cosmology was a speculative science based on a very limited number of observations and characterized by a dispute between steady state theorists and promoters of Big Bang cosmology. It was not until the 1990s and beyond that the astronomical observations would be able to eliminate competing theories and drive the science to the "Golden Age of Cosmology" which was heralded by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dark Matter
Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect. Various astrophysical observationsincluding gravitational effects which cannot be explained by currently accepted theories of gravity unless more matter is present than can be seenimply dark matter's presence. For this reason, most experts think that dark matter is abundant in the universe and has had a strong influence on its structure and evolution. The primary evidence for dark matter comes from calculations showing that many galaxies would behave quite differently if they did not contain a large amount of unseen matter. Some galaxies would not have formed at all and others would not move as they currently do. Other lines of evidence include observa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dark Energy
In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. The first observational evidence for its existence came from measurements of supernovas, which showed that the universe does not expand at a constant rate; rather, the universe's expansion is accelerating. Understanding the universe's evolution requires knowledge of its starting conditions and composition. Before these observations, scientists thought that all forms of matter and energy in the universe would only cause the expansion to slow down over time. Measurements of the cosmic microwave background (CMB) suggest the universe began in a hot Big Bang, from which general relativity explains its evolution and the subsequent large-scale motion. Without introducing a new form of energy, there was no way to explain how scientists could measure an accelerating universe. Since the 1990s, dark energy has been the most accepted premise to account for the acce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telescope
A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally meaning only an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, the word ''telescope'' now refers to a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors. The first known practical telescopes were refracting telescopes with glass lenses and were invented in the Netherlands at the beginning of the 17th century. They were used for both terrestrial applications and astronomy. The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. In the 20th century, many new types of telescopes were invented, including radio telescopes in the 1930s and infrared telescopes in the 1960s. Etymology The word ''telescope'' was coin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golden Ages (metaphor)
A golden age is a period considered the apotheosis in the history of a country or people, a time period when the greatest achievements were made. The term originated from early Greek and Roman poets, who used it to refer to a time when mankind lived in a better time and was pure (see Golden Age). The ancient Greek philosopher Hesiod introduced the term in his ''Works and Days'', when referring to the period when the "Golden Race" of man lived. This was part of fivefold division of Ages of Man, starting with the Golden age, then the Silver Age, the Bronze Age, the Age of Heroes (including the Trojan War), and finally, the current Iron Age. The concept was further refined by Ovid, in his ''Metamorphoses'', into the four "metal ages" (golden, silver, bronze, and iron). The Golden age in Classic literature The Golden age as described by Hesiod was an age where all humans were created directly by the Olympian gods. They did not have women in their ranks but once Dianne and Kev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
