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... of our Galaxy has changed over time. To understand the formation and evolution of the Galaxy, a view of its (and thus our own) past would be useful. Unfortunately, this is physically impossible. However, due to the finite speed of light, we see objects at large distances in an earlier state, as they ...
... of our Galaxy has changed over time. To understand the formation and evolution of the Galaxy, a view of its (and thus our own) past would be useful. Unfortunately, this is physically impossible. However, due to the finite speed of light, we see objects at large distances in an earlier state, as they ...
Rest of the Universe
... Other pieces of evidence came from gravitational lensing, which happens when the gravity of a large object bends the light waves around that object. Per Albert Einstein's theory of general relativity, gravity bends space (like a sumo wrestler might deform the mat he is standing on), so light rays be ...
... Other pieces of evidence came from gravitational lensing, which happens when the gravity of a large object bends the light waves around that object. Per Albert Einstein's theory of general relativity, gravity bends space (like a sumo wrestler might deform the mat he is standing on), so light rays be ...
TOWARDS AN UNDERSTANDING OF DARK MATTER: PRECISE
... direct photographs of the universe when it was a mere 300,000 years old at an epoch known as Recombination, well before the formation of the first stars and galaxies. (For comparison, the earliest images we have of galaxies date back to when the universe was about a billion years old.) Before Recomb ...
... direct photographs of the universe when it was a mere 300,000 years old at an epoch known as Recombination, well before the formation of the first stars and galaxies. (For comparison, the earliest images we have of galaxies date back to when the universe was about a billion years old.) Before Recomb ...
The Formation and Evolution of Massive Black Holes - Ira-Inaf
... MBHs become visible when they accrete gas directly from their surroundings, or, occasionally, when they disrupt an unlucky star passing too close by (20). The gravitational potential energy of the accreted mass is converted to radiation, making the black hole luminous. Luminous, accreting MBHs are g ...
... MBHs become visible when they accrete gas directly from their surroundings, or, occasionally, when they disrupt an unlucky star passing too close by (20). The gravitational potential energy of the accreted mass is converted to radiation, making the black hole luminous. Luminous, accreting MBHs are g ...
Galaxy Evolution
... masses per year or M yr−1 (this is the total stellar mass, not the number, of new stars). The STELLAR MASSES of freshly produced stars are not all equal, but vary approximately between 100 solar masses to about one tenth of solar mass (i.e. stars whose mass is between one hundred times and one tent ...
... masses per year or M yr−1 (this is the total stellar mass, not the number, of new stars). The STELLAR MASSES of freshly produced stars are not all equal, but vary approximately between 100 solar masses to about one tenth of solar mass (i.e. stars whose mass is between one hundred times and one tent ...
(Real) Time Machine Demonstration Manual
... The Big Bang model of the origin of the universe states that the universe originated in a very hot, very dense state 12-15 billion years ago and has been expanding and cooling ever since. In 1948, physicists George Gamow, Ralph Alpher, and Robert Herman predicted that there must be light throughout ...
... The Big Bang model of the origin of the universe states that the universe originated in a very hot, very dense state 12-15 billion years ago and has been expanding and cooling ever since. In 1948, physicists George Gamow, Ralph Alpher, and Robert Herman predicted that there must be light throughout ...
Galaxy Evolution Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mauro Giavalisco
... masses per year or M yr−1 (this is the total stellar mass, not the number, of new stars). The STELLAR MASSES of freshly produced stars are not all equal, but vary approximately between 100 solar masses to about one tenth of solar mass (i.e. stars whose mass is between one hundred times and one tent ...
... masses per year or M yr−1 (this is the total stellar mass, not the number, of new stars). The STELLAR MASSES of freshly produced stars are not all equal, but vary approximately between 100 solar masses to about one tenth of solar mass (i.e. stars whose mass is between one hundred times and one tent ...
Gravitational Lensing: An Unique Probe of Dark Matter and Dark...
... infinite magnification called critical lines. Transferred to the source plane these line become caustics. The location of these lines depends on the relative distances of the source and lens and, of course, the distribution of matter in the lens. The position of the background source with respect to ...
... infinite magnification called critical lines. Transferred to the source plane these line become caustics. The location of these lines depends on the relative distances of the source and lens and, of course, the distribution of matter in the lens. The position of the background source with respect to ...
instructor notes: weeks 9/10
... galaxies (S0s) via collisions between spirals. That results in the dust and gas being swept out of the galaxies by ram pressure. Because they have been swept clean of material for making new stars, lenticular galaxies contain only old stars, like elliptical galaxies, and lack the distinguishing feat ...
... galaxies (S0s) via collisions between spirals. That results in the dust and gas being swept out of the galaxies by ram pressure. Because they have been swept clean of material for making new stars, lenticular galaxies contain only old stars, like elliptical galaxies, and lack the distinguishing feat ...
Cosmic Strings - University of Amsterdam
... The cosmic microwave background (CMB) shows the afterglow of the Big Bang, with slight temperature differences indicating density fluctuations responsible for the structure in our universe. When cosmic strings were first predicted, they were a candidate for the seeds of density perturbations that c ...
... The cosmic microwave background (CMB) shows the afterglow of the Big Bang, with slight temperature differences indicating density fluctuations responsible for the structure in our universe. When cosmic strings were first predicted, they were a candidate for the seeds of density perturbations that c ...
Homework #3, AST 1002
... Which of the following is (are) correct? (a) The cosmological redshift is caused by the expansion of space. (b) The larger the Hubble constant (H) is, the older the Universe. (c) The 3 degree background radiation arose at the time of inflation in the early universe. The correct answer(s) is(are) ___ ...
... Which of the following is (are) correct? (a) The cosmological redshift is caused by the expansion of space. (b) The larger the Hubble constant (H) is, the older the Universe. (c) The 3 degree background radiation arose at the time of inflation in the early universe. The correct answer(s) is(are) ___ ...
Stellar Helium Burning in Other Universes: A
... for the fundamental constants, this paper considers stellar models in universes where 8 Be is stable. Many previous authors have noted that stars in our universe would have difficulty producing carbon and other heavy elements in the absence of the well-known 12 C resonance at 7.6 MeV. This resonance ...
... for the fundamental constants, this paper considers stellar models in universes where 8 Be is stable. Many previous authors have noted that stars in our universe would have difficulty producing carbon and other heavy elements in the absence of the well-known 12 C resonance at 7.6 MeV. This resonance ...
On early and late phases of acceleration of the
... I had the chance to have wonderful people on my side that I will name in some details in the acknowledgment section. This manuscript is the final product of three years of research about some selected topics of modern cosmology. I choose to link the questions I was trying to answer during this perio ...
... I had the chance to have wonderful people on my side that I will name in some details in the acknowledgment section. This manuscript is the final product of three years of research about some selected topics of modern cosmology. I choose to link the questions I was trying to answer during this perio ...
Virtual Science Fair - Dark Matter Alexander Mashaal
... The Mystery of our universe today, is Dark Matter. Dark Matter is the heart of our galaxy, and it keeps the planets and stars from flying away or moving positions. Dark Matter is the pitch black matter around the stars and planets. Dark Matter makes up 96% of our galaxy, and the rest is gases, stars ...
... The Mystery of our universe today, is Dark Matter. Dark Matter is the heart of our galaxy, and it keeps the planets and stars from flying away or moving positions. Dark Matter is the pitch black matter around the stars and planets. Dark Matter makes up 96% of our galaxy, and the rest is gases, stars ...
Module 4.1 - The Scale of the Universe [slide 1] We now turn to
... colors or temperatures, then we can read off their absolute magnitudes. From absolute and apparent magnitudes, we can figure out how far they are. In a given cluster you may have thousands of stars, and therefore you can determine the distance very precisely, the distance to the cluster itself. Now ...
... colors or temperatures, then we can read off their absolute magnitudes. From absolute and apparent magnitudes, we can figure out how far they are. In a given cluster you may have thousands of stars, and therefore you can determine the distance very precisely, the distance to the cluster itself. Now ...
Cosmology Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015
... matter organizing the universe… occurred at about 100s. The actual galaxies appeared much later. “A fraction of a second and the elements were made” Inaccurate. H & He (a little Li) very quickly at few second. Everything else as massive stars fused elements up to iron in their core and then went ...
... matter organizing the universe… occurred at about 100s. The actual galaxies appeared much later. “A fraction of a second and the elements were made” Inaccurate. H & He (a little Li) very quickly at few second. Everything else as massive stars fused elements up to iron in their core and then went ...
Populations of Galaxies and their Formation at z < 7
... How many stars are there in the universe? Integrated mass function at z = 0: Integrated history z = 0 - 1000 ...
... How many stars are there in the universe? Integrated mass function at z = 0: Integrated history z = 0 - 1000 ...
Ultra-high-energy cosmic-rays
... But relies on extrapolations of hadronic physics models! + details do not work perfectly well: more muons than predicted!! constraints for and from high-energy physics! Glasgow, 13 Nov. 20012! ...
... But relies on extrapolations of hadronic physics models! + details do not work perfectly well: more muons than predicted!! constraints for and from high-energy physics! Glasgow, 13 Nov. 20012! ...
SPECTROSCOPY OF HIGH-REDSHIFT TYPE Ia SUPERNOVAE
... orthogonal direction to the flat universe line, and towards higher values of both Ω M and ΩΛ . This can readily be understood via a simple analogy: the matter term in the Friedmann equations acts like a “break” on the expansion, whereas the Λ term acts like an “accelerator”. One can imagine obtainin ...
... orthogonal direction to the flat universe line, and towards higher values of both Ω M and ΩΛ . This can readily be understood via a simple analogy: the matter term in the Friedmann equations acts like a “break” on the expansion, whereas the Λ term acts like an “accelerator”. One can imagine obtainin ...
Spacetime is a manifold that is continuous and differentiable
... of relativity (SRT). This is the Minkowski metric. Thus, we can choose at each point P of the manifold a coordinate system in which the Minkowski metric is valid. While in the SRT this can be a global coordinate system, in general relativity (GR) this is only locally possible. With this procedure w ...
... of relativity (SRT). This is the Minkowski metric. Thus, we can choose at each point P of the manifold a coordinate system in which the Minkowski metric is valid. While in the SRT this can be a global coordinate system, in general relativity (GR) this is only locally possible. With this procedure w ...
A new view of galaxy evolution
... the universe is in a “dark” form that cannot be period. The critical aspect of this, however, is detected directly. The nature of this dark mat- that very little to no additional mass is added to ter, however, has a direct and perhaps primary a galaxy once it forms in the very early universe. role i ...
... the universe is in a “dark” form that cannot be period. The critical aspect of this, however, is detected directly. The nature of this dark mat- that very little to no additional mass is added to ter, however, has a direct and perhaps primary a galaxy once it forms in the very early universe. role i ...
Chapter 12: Stars and Galaxies
... When light from a star is passed through a spectroscope, astronomers see dark absorption lines that are produced as light passes through the star’s cooler, less dense atmosphere. Each element contributes its own set of absorption lines to this absorption spectrum, such as those shown in Figure 5. Wh ...
... When light from a star is passed through a spectroscope, astronomers see dark absorption lines that are produced as light passes through the star’s cooler, less dense atmosphere. Each element contributes its own set of absorption lines to this absorption spectrum, such as those shown in Figure 5. Wh ...
Astronomy - Glen Ridge Public Schools
... 1. What is Astronomy and how does it differ from Astrology? 2. How big is the universe? 3. What units of distance are used in astronomy? 4. How was the first successful determination of light speed made? 5. How do we measure distances to nearby stars? 6. What is the basic structure of the solar syst ...
... 1. What is Astronomy and how does it differ from Astrology? 2. How big is the universe? 3. What units of distance are used in astronomy? 4. How was the first successful determination of light speed made? 5. How do we measure distances to nearby stars? 6. What is the basic structure of the solar syst ...
Interference of dark matter solitons and galactic offsets
... In this context, the first evidence of dark matter (DM) nongravitational self-interaction has been recently reported for the Abell 3827 cluster [2] (z ≈ 0.1), where a displacement of the stars with respect to the maximum density of its DM halo has been observed, for some of the merging galaxies [3]. ...
... In this context, the first evidence of dark matter (DM) nongravitational self-interaction has been recently reported for the Abell 3827 cluster [2] (z ≈ 0.1), where a displacement of the stars with respect to the maximum density of its DM halo has been observed, for some of the merging galaxies [3]. ...
Fuzzy Dark Matter
... course, anything Witten writes does; but this paper is also quite readable, as opposed to many string theory works which remain inscrutable to most of us. The authors take in consideration a hypothesis that is not new, and study it in detail, coming to several interesting conclusions. The idea is ca ...
... course, anything Witten writes does; but this paper is also quite readable, as opposed to many string theory works which remain inscrutable to most of us. The authors take in consideration a hypothesis that is not new, and study it in detail, coming to several interesting conclusions. The idea is ca ...
Chronology of the universe
The chronology of the universe describes the history and future of the universe according to Big Bang cosmology, the prevailing scientific model of how the universe developed over time from the Planck epoch, using the cosmological time parameter of comoving coordinates. The model of the universe's expansion is known as the Big Bang. As of 2015, this expansion is estimated to have begun 13.799 ± 0.021 billion years ago. It is convenient to divide the evolution of the universe so far into three phases.