wk11
... elliptical galaxy can be measured by its `velocity dispersion' (or spread in velocity among the different stars relative to us) along the line of sight. • The indication is that elliptical galaxies too contain dark matter (a somewhat higher proportion than spiral galaxies, in fact), with M/L ratios ...
... elliptical galaxy can be measured by its `velocity dispersion' (or spread in velocity among the different stars relative to us) along the line of sight. • The indication is that elliptical galaxies too contain dark matter (a somewhat higher proportion than spiral galaxies, in fact), with M/L ratios ...
Scale-invariant theory of gravitation
... Holographic dark energy: based on holographic principle which state that entropy of a system scales not with its volume but with its surface area L2 ...
... Holographic dark energy: based on holographic principle which state that entropy of a system scales not with its volume but with its surface area L2 ...
Astrophysics
... for the interior of the sun, i.e., express dP/dr in terms of G, m, ρ, and r, where m is the mass interior to radius r and ρ is the mass density. b. (1 pt) Rewrite the equation with m as the independent variable, i.e, dP/dm = ... c. (1 pt) Use the dP/dm equation to obtain an approximate expression fo ...
... for the interior of the sun, i.e., express dP/dr in terms of G, m, ρ, and r, where m is the mass interior to radius r and ρ is the mass density. b. (1 pt) Rewrite the equation with m as the independent variable, i.e, dP/dm = ... c. (1 pt) Use the dP/dm equation to obtain an approximate expression fo ...
Solutions for class #9 from Yosunism website Problem 55:
... (A) By the Larmor formula, one has , where q is the charge and a is the acceleration. Since the charge is constant, this choice is true. (B) This is also true by Larmor's formula. (C) True. The energy radiated through a perpendicular unit area is given by the Poynting vector. and far away. Also, les ...
... (A) By the Larmor formula, one has , where q is the charge and a is the acceleration. Since the charge is constant, this choice is true. (B) This is also true by Larmor's formula. (C) True. The energy radiated through a perpendicular unit area is given by the Poynting vector. and far away. Also, les ...
Astro-2: History of the Universe
... • Redshifts can be measured very precisely, much more precisely than you know your height!!! For this reason astronomers generally say a galaxy is at a redshift z=0.4231, rather than quoting its distance • Distances can be known only to about 5% • In cosmology, as in all of physics, measurements ...
... • Redshifts can be measured very precisely, much more precisely than you know your height!!! For this reason astronomers generally say a galaxy is at a redshift z=0.4231, rather than quoting its distance • Distances can be known only to about 5% • In cosmology, as in all of physics, measurements ...
Word doc - GDN - University of Gloucestershire
... still be detected at the edges of the Universe. Support for this hypothesis came from the discovery in the 1960s by Arno Penzias and Robert Wilson of the Bell telephone Laboratories, of what came to be known as the Cosmic Microwave Background (http://cfpa.berkeley.edu/darkmat/cmb.html). The discover ...
... still be detected at the edges of the Universe. Support for this hypothesis came from the discovery in the 1960s by Arno Penzias and Robert Wilson of the Bell telephone Laboratories, of what came to be known as the Cosmic Microwave Background (http://cfpa.berkeley.edu/darkmat/cmb.html). The discover ...
Edgar Allan Poe: the first man to conceive a Newtonian evolving
... When he was composing Eureka, we used to walk up and down the garden, his arm around me, mine around him, until I was so tired I could not walk. He would stop every few minutes and explain his ideas to me, and ask if I understood him. 2The first lecture happened on the 2-3 February 1848. The Daily T ...
... When he was composing Eureka, we used to walk up and down the garden, his arm around me, mine around him, until I was so tired I could not walk. He would stop every few minutes and explain his ideas to me, and ask if I understood him. 2The first lecture happened on the 2-3 February 1848. The Daily T ...
Galaxies and the Universe
... compare with the lines in Figures 20B and 20C? They have shifted in position. What caused this shift? As you just read, when a star is moving toward Earth, its wavelengths of light are compressed, just as the sound waves from the train’s whistle are. This causes the dark lines in the spectrum to shi ...
... compare with the lines in Figures 20B and 20C? They have shifted in position. What caused this shift? As you just read, when a star is moving toward Earth, its wavelengths of light are compressed, just as the sound waves from the train’s whistle are. This causes the dark lines in the spectrum to shi ...
Galaxies - WordPress.com
... What are Galaxies? We are part of the Milky Way galaxy. Our star is only one among hundreds of billions. The Milky Way galaxy is a spiral galaxy that is shaped like a thin disk with a central bulge. ...
... What are Galaxies? We are part of the Milky Way galaxy. Our star is only one among hundreds of billions. The Milky Way galaxy is a spiral galaxy that is shaped like a thin disk with a central bulge. ...
Introduction Introduction to to Astrophysics Astrophysics
... according to the law of Hubble: the velocity that two galaxies separate from each other increases linearly1 with their distance. This causes the entire universe itself to expand. This expansion will be discussed later, but we already notice that it is not an expansion in a void, but an expansion of ...
... according to the law of Hubble: the velocity that two galaxies separate from each other increases linearly1 with their distance. This causes the entire universe itself to expand. This expansion will be discussed later, but we already notice that it is not an expansion in a void, but an expansion of ...
creating a universe, a conceptual model
... ISSN 2518-1866 (Online), ISSN 2307-3705 (Print). Philosophy & Cosmology 2016 (Vol. 17) ...
... ISSN 2518-1866 (Online), ISSN 2307-3705 (Print). Philosophy & Cosmology 2016 (Vol. 17) ...
string percolation and the color glass condensate
... with the average string tension value < x2 >. Gaussian fluctuations in the string tension ...
... with the average string tension value < x2 >. Gaussian fluctuations in the string tension ...
1/2 - Indico
... Standard Big-Bang model basic physics: If the recessional velocity of every galaxy remained unchanged through all time, any galaxy now receding from us was once arbitrarily close and the time that has elapsed since then is equal to the ratio of galaxy’s distance and its velocity. Since this ratio is ...
... Standard Big-Bang model basic physics: If the recessional velocity of every galaxy remained unchanged through all time, any galaxy now receding from us was once arbitrarily close and the time that has elapsed since then is equal to the ratio of galaxy’s distance and its velocity. Since this ratio is ...
Response to Dr. Laurence Krauss of the
... and thus accelerates outwards. But the big problem for the Big Bang is that their most sophisticated instruments have not been able to detect any of this needed matter (including Krauss’ “Germanium” detector he speaks about in the lecture).2 So the next best thing is for them to say the matter “is t ...
... and thus accelerates outwards. But the big problem for the Big Bang is that their most sophisticated instruments have not been able to detect any of this needed matter (including Krauss’ “Germanium” detector he speaks about in the lecture).2 So the next best thing is for them to say the matter “is t ...
08. Comparing Densities
... greater densities than liquids and liquids usually have greater densities than gases. Why? Because solids have particles that are more tightly packed together than liquids and liquids are more tightly packed than gases. Exception to the rule: mercury is a metal that is liquid at room temperature ...
... greater densities than liquids and liquids usually have greater densities than gases. Why? Because solids have particles that are more tightly packed together than liquids and liquids are more tightly packed than gases. Exception to the rule: mercury is a metal that is liquid at room temperature ...
Document
... • What about Gravity? – Gravity should unify with the GUTs force at very high energies. – Much higher than in any possible accelerator. accelerator – However, these energies could occur in the early Universe Universe. ...
... • What about Gravity? – Gravity should unify with the GUTs force at very high energies. – Much higher than in any possible accelerator. accelerator – However, these energies could occur in the early Universe Universe. ...
Chapter 17
... Protons and As the universe expanded, it cooled down as its energy spread out over neutrons form a larger volume. About four minutes after the Big Bang, the universe at 4 minutes had cooled enough that protons and neutrons could stick together to form the nuclei of atoms. Because atoms were still fl ...
... Protons and As the universe expanded, it cooled down as its energy spread out over neutrons form a larger volume. About four minutes after the Big Bang, the universe at 4 minutes had cooled enough that protons and neutrons could stick together to form the nuclei of atoms. Because atoms were still fl ...
Gravitational Wave Generation in Rotating Compact Stars
... density are ρ(0) = 0.14 fm−3 and nν (0) = 1.40 × 10−2 fm−3 , respectively. For L0 = 2.6 × 1049 g · cm2 · s−1 the initial values of the semi-axes are a1 (0) = 2.96 × 106 cm, a2 (0) = 1.48 × 106 cm and a3 (0) = 8.6 × 105 cm. In this case the values of the initial baryon density and neutrino density ar ...
... density are ρ(0) = 0.14 fm−3 and nν (0) = 1.40 × 10−2 fm−3 , respectively. For L0 = 2.6 × 1049 g · cm2 · s−1 the initial values of the semi-axes are a1 (0) = 2.96 × 106 cm, a2 (0) = 1.48 × 106 cm and a3 (0) = 8.6 × 105 cm. In this case the values of the initial baryon density and neutrino density ar ...
Structure of the solar system
... When two stars can not be seen but can be inferred due to the shift in their spectral lines. As one star (B) is moving away from Earth, its spectral lines (or absorption lines) will be red-shifted. As the other star is moving towards Earth (A), its lines will be blue-shifted. As they two stars are m ...
... When two stars can not be seen but can be inferred due to the shift in their spectral lines. As one star (B) is moving away from Earth, its spectral lines (or absorption lines) will be red-shifted. As the other star is moving towards Earth (A), its lines will be blue-shifted. As they two stars are m ...
light year - Otterbein University
... Human scale: yardstick Geographical scale: triangulation Solar system scale: Radar ranging Intragalactic scale: – Close stars: stellar parallax – Far: spectroscopic parallax ...
... Human scale: yardstick Geographical scale: triangulation Solar system scale: Radar ranging Intragalactic scale: – Close stars: stellar parallax – Far: spectroscopic parallax ...
EarthComm_c1s3
... the big bang theory. However, it continues to be tested and examined. Another explanation is the steady-state theory. It is also known as the infinite-universe theory. This theory suggests the universe has always existed. It did not have a moment of creation, or a time zero. The theory suggests that ...
... the big bang theory. However, it continues to be tested and examined. Another explanation is the steady-state theory. It is also known as the infinite-universe theory. This theory suggests the universe has always existed. It did not have a moment of creation, or a time zero. The theory suggests that ...
ν - Luleå tekniska universitet
... • These are often used as units of measurement for celestial bodies, e.g. the mass of the black hole in the center of the Milky way has a mass of 3.7×106 M ...
... • These are often used as units of measurement for celestial bodies, e.g. the mass of the black hole in the center of the Milky way has a mass of 3.7×106 M ...
Flatness problem
The flatness problem (also known as the oldness problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. Such problems arise from the observation that some of the initial conditions of the universe appear to be fine-tuned to very 'special' values, and that a small deviation from these values would have had massive effects on the nature of the universe at the current time.In the case of the flatness problem, the parameter which appears fine-tuned is the density of matter and energy in the universe. This value affects the curvature of space-time, with a very specific critical value being required for a flat universe. The current density of the universe is observed to be very close to this critical value. Since the total density departs rapidly from the critical value over cosmic time, the early universe must have had a density even closer to the critical density, departing from it by one part in 1062 or less. This leads cosmologists to question how the initial density came to be so closely fine-tuned to this 'special' value.The problem was first mentioned by Robert Dicke in 1969. The most commonly accepted solution among cosmologists is cosmic inflation, the idea that the universe went through a brief period of extremely rapid expansion in the first fraction of a second after the Big Bang; along with the monopole problem and the horizon problem, the flatness problem is one of the three primary motivations for inflationary theory.