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• • • Dark matter is a form of that is thought to account for approximately 85% of the matter in the, and about a quarter of. The majority of dark matter is thought to be non- in nature, possibly being composed of some as-yet undiscovered. Its presence is implied in a variety of observations, including effects that cannot be explained unless more matter is present than can be seen. For this reason, most experts think dark matter to be ubiquitous in the universe and to have had a strong influence on its structure and evolution. Dark matter is called dark because it does not appear to interact with observable, such as, and is thus invisible to the entire, making it extremely difficult to detect using usual astronomical equipment. The primary evidence for dark matter is that calculations show that many would fly apart instead of rotating, or would not have formed or move as they do, if they did not contain a large amount of unseen matter. Other lines of evidence include observations in, from the, from astronomical observations of the 's current structure, from the, from mass location during, and from the motion of galaxies within.

In the standard model of cosmology, the total of the universe contains 5% and, 27% dark matter and 68% of an unknown form of energy known as. Contoh proposal kegiatan 17 augustus peringatan hut ri di. Thus, dark matter constitutes 85% of total, while dark energy plus dark matter constitute 95% of total mass–energy content. Because dark matter has not yet been observed directly, if it exists, it must barely interact with ordinary matter and radiation, except through gravity. The primary candidate for dark matter is some new kind of that has, in particular, (WIMPs), or (GIMPs). Many experiments to directly detect and study dark matter particles are being actively undertaken, but none has yet succeeded. Dark matter is classified as cold, warm, or hot according to its (more precisely, its ).

A Wireless Site Survey Tool for Everyone. VisiWave is designed to be straightforward to use but still effective at analyzing, describing, and documenting your Wi. Buy, Rent & Sell Residential, Commercial & Agricultural properties in India. Find great deals on Apartments, Homes, Villas, PG & many other real estate properties. Dark matter is a hypothetical form of matter that is thought to account for approximately 85% of. From the X-ray energy spectrum and flux, the gas temperature and density. Weak gravitational lensing investigates minute distortions of galaxies, using statistical analyses from vast galaxy surveys. 2011 (968283): 1–22.

Current models favor a scenario, in which by gradual accumulation of particles. Although the existence of dark matter is generally accepted by the scientific community, some astrophysicists, intrigued by certain observations that do not fit the dark matter theory, argue for various modifications of the standard laws of, such as,,.