Cosmic Hide and Seek: the Search for the Missing
... expansion in all directions an expanding universe. The Big Bang theory is a current model for the origin of our universe which says all the matter that exists was, at one time, compressed into a single point. The Big Bang distributed all the matter evenly in all directions. Then the matter started t ...
... expansion in all directions an expanding universe. The Big Bang theory is a current model for the origin of our universe which says all the matter that exists was, at one time, compressed into a single point. The Big Bang distributed all the matter evenly in all directions. Then the matter started t ...
NAME
... ____ 11. Elliptical galaxies appear red because: a. they are moving away from us b. they contain mostly ionized hydrogen gas c. they contain mostly old stars d. they contain lots of dust e. they contain a mix of old and young stars ____ 12. The disks of spiral galaxies appear blue because: a. they ...
... ____ 11. Elliptical galaxies appear red because: a. they are moving away from us b. they contain mostly ionized hydrogen gas c. they contain mostly old stars d. they contain lots of dust e. they contain a mix of old and young stars ____ 12. The disks of spiral galaxies appear blue because: a. they ...
Measuring the Masses of Galaxies in the Sloan Digital Sky Survey
... distance ≈ z × age of Universe (z << 1) distance ≅ [z / (1+z)] × age of Universe e.g., for z = 0.0061, d = 0.00606 × 13.5 billion = 82 million light-years caveat: redshift must represent expansion of Universe, not orbital motion ...
... distance ≈ z × age of Universe (z << 1) distance ≅ [z / (1+z)] × age of Universe e.g., for z = 0.0061, d = 0.00606 × 13.5 billion = 82 million light-years caveat: redshift must represent expansion of Universe, not orbital motion ...
Document
... cluster seemed to be moving to rapidly to be held together by the gravitational attraction of the visible matter. The matter which we see or detect from instrument is just 4% of the total mass of the universe; 23% is the dark matter which is invisible, gravitationally attractive; and rest of 73% is ...
... cluster seemed to be moving to rapidly to be held together by the gravitational attraction of the visible matter. The matter which we see or detect from instrument is just 4% of the total mass of the universe; 23% is the dark matter which is invisible, gravitationally attractive; and rest of 73% is ...
Topic 4 - The University of Sheffield
... (1)!A MACHO Event should never repeat (they are too rare). (2)!The Light Curve for a MACHO should be symmetric in ! time, i.e. rising and falling with the same shape. (3)!The magnitude of the Light Amplification should be the ! ! same in all wavelengths e.g. the blue and red wavebands ! as typically ...
... (1)!A MACHO Event should never repeat (they are too rare). (2)!The Light Curve for a MACHO should be symmetric in ! time, i.e. rising and falling with the same shape. (3)!The magnitude of the Light Amplification should be the ! ! same in all wavelengths e.g. the blue and red wavebands ! as typically ...
Interference of dark matter solitons and galactic offsets
... conditions, the cosmological evolution of the axion field can be computed deterministically in the semiclassical description of Eq. (1) [13]. In practice, uncertainties in the initial conditions and the evolution imply that the relative phase for a particular collision can actually be considered as ...
... conditions, the cosmological evolution of the axion field can be computed deterministically in the semiclassical description of Eq. (1) [13]. In practice, uncertainties in the initial conditions and the evolution imply that the relative phase for a particular collision can actually be considered as ...
Equation of state constraints for the cold dense matter inside neutron
... © ESO, 2016.The cooling phase of thermonuclear (type-I) X-ray bursts can be used to constrain neutron star (NS) compactness by comparing the observed cooling tracks of bursts to accurate theoretical atmosphere model calculations. By applying the so-called cooling tail method, where the information f ...
... © ESO, 2016.The cooling phase of thermonuclear (type-I) X-ray bursts can be used to constrain neutron star (NS) compactness by comparing the observed cooling tracks of bursts to accurate theoretical atmosphere model calculations. By applying the so-called cooling tail method, where the information f ...
ASTRONOMY WEBQUEST…… EXPLORE THE UNIVERSE
... 11. What happened following the Big Bang to allow protons and neutrons to come together to form atoms and eventually atoms to come together to form different elements? __________________________________________________________________________________ http://map.gsfc.nasa.gov/universe/bb_tests.html ...
... 11. What happened following the Big Bang to allow protons and neutrons to come together to form atoms and eventually atoms to come together to form different elements? __________________________________________________________________________________ http://map.gsfc.nasa.gov/universe/bb_tests.html ...
Galaxies
... protogalactic clouds that were able to cool and form stars before gas settled into a disk ...
... protogalactic clouds that were able to cool and form stars before gas settled into a disk ...
“Dark Physics” and Dipole Moments
... The Existence of Dark Matter throughout the Universe is well Established by Astrophysics, particularly gravitational lensing New Stable Particle? Properties? An entire new sector? i) Underground Detection & H.E. Positron & γ-ray Excesses The Hunt For Dark Particles (≥80% of all Matter!) • Undergrou ...
... The Existence of Dark Matter throughout the Universe is well Established by Astrophysics, particularly gravitational lensing New Stable Particle? Properties? An entire new sector? i) Underground Detection & H.E. Positron & γ-ray Excesses The Hunt For Dark Particles (≥80% of all Matter!) • Undergrou ...
Dark Matter and Dark Energy - Trans
... indicative of the dark matter particles. As the earth moves relative to the galaxy, the dark matter of the galaxy will pass through each cubic centimeter of the earth at a rate of about one hundred thousand particles per second if we assume the mass expected of a WIMP [11]. It stands to reason that ...
... indicative of the dark matter particles. As the earth moves relative to the galaxy, the dark matter of the galaxy will pass through each cubic centimeter of the earth at a rate of about one hundred thousand particles per second if we assume the mass expected of a WIMP [11]. It stands to reason that ...
Dark matter
Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but would account for most of the matter in the universe. The existence and properties of dark matter are inferred from its gravitational effects on visible matter, on radiation, and on the large-scale structure of the universe. Dark matter has not been detected directly, making it one of the greatest mysteries in modern astrophysics.Dark matter neither emits nor absorbs light or any other electromagnetic radiation at any significant level. According to the Planck mission team, and based on the standard model of cosmology, the total mass–energy of the known universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy. Thus, dark matter is estimated to constitute 84.5% of the total matter in the universe, while dark energy plus dark matter constitute 95.1% of the total mass–energy content of the universe.Astrophysicists hypothesized the existence of dark matter to account for discrepancies between the mass of large astronomical objects determined from their gravitational effects, and their mass as calculated from the observable matter (stars, gas, and dust) that they can be seen to contain. Their gravitational effects suggest that their masses are much greater than the observable matter survey suggests. Dark matter was postulated by Jan Oort in 1932, albeit based upon insufficient evidence, to account for the orbital velocities of stars in the Milky Way. In 1933, Fritz Zwicky was the first to use the virial theorem to infer the existence of unseen matter, which he referred to as dunkle Materie 'dark matter'. More robust evidence from galaxy rotation curves was discovered by Horace W. Babcock in 1939, but was not attributed to dark matter. The first hypothesis to postulate ""dark matter"" based upon robust evidence was formulated by Vera Rubin and Kent Ford in the 1960s–1970s, using galaxy rotation curves. Subsequently, many other observations have indicated the presence of dark matter in the universe, including gravitational lensing of background objects by galaxy clusters such as the Bullet Cluster, the temperature distribution of hot gas in galaxies and clusters of galaxies and, more recently, the pattern of anisotropies in the cosmic microwave background. According to consensus among cosmologists, dark matter is composed primarily of a not yet characterized type of subatomic particle.The search for this particle, by a variety of means, is one of the major efforts in particle physics today.Although the existence of dark matter is generally accepted by the mainstream scientific community, some alternative theories of gravity have been proposed, such as MOND and TeVeS, which try to account for the anomalous observations without requiring additional matter. However, these theories cannot account for the properties of galaxy clusters.