WIMPs and MACHOs - Caltech Astronomy
... WIMP is an acronym for weakly interacting massive particle and MACHO is an acronym for massive (astrophysical) compact halo object. WIMPs and MACHOs are two of the most popular DARK MATTER candidates. They represent two very different but reasonable possibilities of what the dominant component of th ...
... WIMP is an acronym for weakly interacting massive particle and MACHO is an acronym for massive (astrophysical) compact halo object. WIMPs and MACHOs are two of the most popular DARK MATTER candidates. They represent two very different but reasonable possibilities of what the dominant component of th ...
An additional term of the Galactic tide due to dark matter
... of the new term is only about ∼15% lower than the old x̃-term. It is the smallest term of all, but is not negligible in more precise calculations for the current location of the Sun in the Galaxy. In the Oort-Cloud dynamical studies in the past, a radial excursion of the Sun has been considered (Mat ...
... of the new term is only about ∼15% lower than the old x̃-term. It is the smallest term of all, but is not negligible in more precise calculations for the current location of the Sun in the Galaxy. In the Oort-Cloud dynamical studies in the past, a radial excursion of the Sun has been considered (Mat ...
The star Betelgeuse is about 500 light years away from us. If this star
... d) space between the Milky Way and its neighbouring galaxies e) none of the above The terrestrial planets are a) Mercury, Mars, Earth, and Venus. b) Jupiter, Saturn, Uranus, and Neptune. c) Jupiter, Saturn, Uranus, Neptune, and Pluto. d) Venus, Earth, and Mars. e) none of the above combinations The ...
... d) space between the Milky Way and its neighbouring galaxies e) none of the above The terrestrial planets are a) Mercury, Mars, Earth, and Venus. b) Jupiter, Saturn, Uranus, and Neptune. c) Jupiter, Saturn, Uranus, Neptune, and Pluto. d) Venus, Earth, and Mars. e) none of the above combinations The ...
Cosmology with objects from the Hamburg Quasar Surveys
... 2.2 The primordial Deuterium abundance D/H from HS 0105+1619 The theory of big bang nucleosynthesis predicts that the primordial D/H ratio depends sensitively on the cosmological baryon to photon ratio nb/nr ( e.g. Kolb & Turner, 1990; Schramm & Turner, 1998). A precise measurement of the primordial ...
... 2.2 The primordial Deuterium abundance D/H from HS 0105+1619 The theory of big bang nucleosynthesis predicts that the primordial D/H ratio depends sensitively on the cosmological baryon to photon ratio nb/nr ( e.g. Kolb & Turner, 1990; Schramm & Turner, 1998). A precise measurement of the primordial ...
CH. 7 - science1d
... Telescope, which is in orbit (circling) high around Earth and looking far out into space. Consider for a moment that the area of sky that this image shows is equal to the area of the head of a pin held at arm’s length. Even in a patch of sky as small as that, we can see all these galaxies. Think abo ...
... Telescope, which is in orbit (circling) high around Earth and looking far out into space. Consider for a moment that the area of sky that this image shows is equal to the area of the head of a pin held at arm’s length. Even in a patch of sky as small as that, we can see all these galaxies. Think abo ...
PDF - Oxford Academic - Oxford University Press
... details. For example, it predicts that the universe is expanding and that distant galaxies are receding from us at a speed that is approximately proportional to their distance. This has been amply confirmed by redshift measurements throughout the 20th century. The Big Bang universe was hotter and de ...
... details. For example, it predicts that the universe is expanding and that distant galaxies are receding from us at a speed that is approximately proportional to their distance. This has been amply confirmed by redshift measurements throughout the 20th century. The Big Bang universe was hotter and de ...
Primordial Planet Formation - University of California San Diego
... Detection of µBD planetary objects from temperature happened because the temperature found was an important one in the physical chemistry of hydrogen, the most common element in the universe and the most probable candidate for the ordinary dark matter. Hydrogen is a gas that condenses to liquid ...
... Detection of µBD planetary objects from temperature happened because the temperature found was an important one in the physical chemistry of hydrogen, the most common element in the universe and the most probable candidate for the ordinary dark matter. Hydrogen is a gas that condenses to liquid ...
A Novel Test of the Modified Newtonian Dynamics with Gas Rich
... a generally covariant parent theory should provide an effective forcing term [24]. The most serious observational problem facing MOND is the dynamics of rich clusters of galaxies. These appear to weigh more than can be accounted for with the observed baryons even with the modified dynamics [25, 26]. ...
... a generally covariant parent theory should provide an effective forcing term [24]. The most serious observational problem facing MOND is the dynamics of rich clusters of galaxies. These appear to weigh more than can be accounted for with the observed baryons even with the modified dynamics [25, 26]. ...
Generation of Cosmological Perturbations by a First
... phase to a broken phase is of strongly first-order. However a very important issue of cosmology has been left out of arguments: One has to explain how and why the universe has attained the large scale inhomogeneities of matter distribution such as superclusters of galaxies. 9 ) This problem must be ...
... phase to a broken phase is of strongly first-order. However a very important issue of cosmology has been left out of arguments: One has to explain how and why the universe has attained the large scale inhomogeneities of matter distribution such as superclusters of galaxies. 9 ) This problem must be ...
Lecture Notes – Galaxies
... Spectra showed strong emission lines which were finally interpreted in 1963 as the Balmer series of hydrogen redshifted by an unprecedented amount of 100 nm for 3C 273 (z = 0.16). Well over 1000 Quasars (Quasi-stellar radio sources) have now been identified. It is generally accepted that their enorm ...
... Spectra showed strong emission lines which were finally interpreted in 1963 as the Balmer series of hydrogen redshifted by an unprecedented amount of 100 nm for 3C 273 (z = 0.16). Well over 1000 Quasars (Quasi-stellar radio sources) have now been identified. It is generally accepted that their enorm ...
1 - People Server at UNCW
... (9 pts) Answer the following: a. ________________ assigned the original magnitude range for stars. b. The binding energy of deuterium is ________________. c. After studying the Coma cluster, ________________ introduced the idea of dark matter. d. The Cepheids were first classified by _______________ ...
... (9 pts) Answer the following: a. ________________ assigned the original magnitude range for stars. b. The binding energy of deuterium is ________________. c. After studying the Coma cluster, ________________ introduced the idea of dark matter. d. The Cepheids were first classified by _______________ ...
Galaxy Hunters Article, Cosmology Information, First Star Facts
... tug provided by dark matter, astronomers say, there wouldn't be enough gravity to pull material into galaxy-size clumps or even form the first star. The concept of dark matter has been around for decades, but cosmologists were slow to embrace it. That might have been because one of the first people ...
... tug provided by dark matter, astronomers say, there wouldn't be enough gravity to pull material into galaxy-size clumps or even form the first star. The concept of dark matter has been around for decades, but cosmologists were slow to embrace it. That might have been because one of the first people ...
Evolution of the Highest Redshift Quasars
... – Only BHs with ideal growth conditions (negative feedback not important) can grow to billion Msun at z~6 – Low BH fraction in halos at the high luminosity (mass) end • Steep quasar luminosity function? ...
... – Only BHs with ideal growth conditions (negative feedback not important) can grow to billion Msun at z~6 – Low BH fraction in halos at the high luminosity (mass) end • Steep quasar luminosity function? ...
Multiple Choice, continued Stars, Galaxies, and the Universe
... that light travels through space in 1 year. Because the speed of light through space is about 300,000 km/ s, light travels approximately 9.46 trillion kilometers in one year. Even after astronomers figured out that stars were far from Earth, the nature of the universe was hard to understand. Some as ...
... that light travels through space in 1 year. Because the speed of light through space is about 300,000 km/ s, light travels approximately 9.46 trillion kilometers in one year. Even after astronomers figured out that stars were far from Earth, the nature of the universe was hard to understand. Some as ...
Science and the Universe - Wayne State University Physics and
... longer explain all the observed facts and was abandoned in favor of a heliocentric model, which fit the experimental evidence better 29 Jun 2005 ...
... longer explain all the observed facts and was abandoned in favor of a heliocentric model, which fit the experimental evidence better 29 Jun 2005 ...
Non-standard cosmology
A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.