Answer to question 1 - Northwestern University
... • What limits the accuracy of my measurement? • How will I calibrate my measurements so that somebody else can judge the results. • What assumptions will I have to make from theory or experiment to build my case. • If I’m looking for an effect (such as WIMPs), will my result be interesting even if I ...
... • What limits the accuracy of my measurement? • How will I calibrate my measurements so that somebody else can judge the results. • What assumptions will I have to make from theory or experiment to build my case. • If I’m looking for an effect (such as WIMPs), will my result be interesting even if I ...
Word version of Episode 704
... that the galaxies themselves expand as space-time does. This does not happen in reality because of the gravitational attraction between the galaxies within a cluster. A different model can be made by gluing cotton wool galaxies to the balloon which then do not expand as the balloon does – however, t ...
... that the galaxies themselves expand as space-time does. This does not happen in reality because of the gravitational attraction between the galaxies within a cluster. A different model can be made by gluing cotton wool galaxies to the balloon which then do not expand as the balloon does – however, t ...
Document
... b. 2,500,000 light years 21. If the Milky Way were in Los Angeles, one hundred miles across, where would the Andromeda Galaxy be? c. New York 22. The Milky Way and Andromeda galaxies will eventually collide. a. True (2 choices) ...
... b. 2,500,000 light years 21. If the Milky Way were in Los Angeles, one hundred miles across, where would the Andromeda Galaxy be? c. New York 22. The Milky Way and Andromeda galaxies will eventually collide. a. True (2 choices) ...
Document
... It is true, for example, that the fine structure constant a has to be close to 1/137 for carbon atoms to exist, and carbon atoms are required for us to be here writing about cosmology. However, these arguments have nothing to do with explaining what physical laws led to this particular value of a. … ...
... It is true, for example, that the fine structure constant a has to be close to 1/137 for carbon atoms to exist, and carbon atoms are required for us to be here writing about cosmology. However, these arguments have nothing to do with explaining what physical laws led to this particular value of a. … ...
Document
... difficult to trace the individual galaxy populations as they evolve into each other at different redshifts. This is the reason why our understanding of galaxy evolution is only possible within the framework of models, with the help of which the different observational results can be interpreted. ...
... difficult to trace the individual galaxy populations as they evolve into each other at different redshifts. This is the reason why our understanding of galaxy evolution is only possible within the framework of models, with the help of which the different observational results can be interpreted. ...
Supernova and Supernova Remnants lec 1-2
... • Need to determine the relationship between distance and redshift – Redshift (‘z’) is the measure of Doppler shift by the expansion of the universe- (1+z)~v/c – In General relativity there are 3 distances of relevance – The proper distance DP that we measure to an object is the distance we would ge ...
... • Need to determine the relationship between distance and redshift – Redshift (‘z’) is the measure of Doppler shift by the expansion of the universe- (1+z)~v/c – In General relativity there are 3 distances of relevance – The proper distance DP that we measure to an object is the distance we would ge ...
Chapter 30 Notes
... Cosmology- the study of the origin, properties, processes, and evolution of the universe Hubble found that the spectra of galaxies, except for the few closest to Earth, were shifted toward the red end of the spectrum. This means that these galaxies are moving away from ours and the amount of red shi ...
... Cosmology- the study of the origin, properties, processes, and evolution of the universe Hubble found that the spectra of galaxies, except for the few closest to Earth, were shifted toward the red end of the spectrum. This means that these galaxies are moving away from ours and the amount of red shi ...
Volcanoes and Igneous Activity Earth - Chapter 4
... • Most galaxies exhibit a red Doppler shift • Far galaxies • Exhibit the greatest shift • Greater velocity • Discovered in 1929 by Edwin Hubble • Hubble’s Law – the recessional speed of galaxies is proportional to their distance • Accounts for red shifts ...
... • Most galaxies exhibit a red Doppler shift • Far galaxies • Exhibit the greatest shift • Greater velocity • Discovered in 1929 by Edwin Hubble • Hubble’s Law – the recessional speed of galaxies is proportional to their distance • Accounts for red shifts ...
Physics Time-Line 585BC to 2000
... off 1800 years later after Gutenberg introduced the printing press in Europe and Coperincus broke the old cosmology and put humans in their place away from the centre of the universe. Since then, thousands of scientists have experienced that Eureka moment when they realised that they have seen a fun ...
... off 1800 years later after Gutenberg introduced the printing press in Europe and Coperincus broke the old cosmology and put humans in their place away from the centre of the universe. Since then, thousands of scientists have experienced that Eureka moment when they realised that they have seen a fun ...
Star formation in galaxies over the last 10 billion
... Two immediate results: I. Galaxies formed at some point in the distant past II. Galaxies evolved with time ...
... Two immediate results: I. Galaxies formed at some point in the distant past II. Galaxies evolved with time ...
Visions of Revolutions: Microphysics and Cosmophysics in the 1930s
... and a few other physicists seriously believed that energy conservation might not be strictly valid in all nuclear processes. The heretical idea was pursued for a couple of years and received with enthusiasm by some of his younger colleagues, including the Leningrad physicists Gamow, Landau, and Matv ...
... and a few other physicists seriously believed that energy conservation might not be strictly valid in all nuclear processes. The heretical idea was pursued for a couple of years and received with enthusiasm by some of his younger colleagues, including the Leningrad physicists Gamow, Landau, and Matv ...
Assignment 10
... ____ 12. Which of the following statements about the implications of Hubble's Law is FALSE? a. the law implies that the whole universe must be expanding b. the law can be used to measure distances to remote galaxies for which we can measure a Doppler shift c. the law does NOT require us to be at th ...
... ____ 12. Which of the following statements about the implications of Hubble's Law is FALSE? a. the law implies that the whole universe must be expanding b. the law can be used to measure distances to remote galaxies for which we can measure a Doppler shift c. the law does NOT require us to be at th ...
Astro 6590: Galaxies and the Universe Astro
... and gas are about 70% hydrogen by mass and 25% helium, the rest being heavier elements (called "metals"). • Typical scales are: masses between 106 to 1012 M (1 solar mass is 2 x 1030 kg), and sizes ~ 1-100 kpc (1 pc = 3.1 x 1016 m). Galaxies that rotate have Prot ~ 10-100 Myr at about 100 km/s. The ...
... and gas are about 70% hydrogen by mass and 25% helium, the rest being heavier elements (called "metals"). • Typical scales are: masses between 106 to 1012 M (1 solar mass is 2 x 1030 kg), and sizes ~ 1-100 kpc (1 pc = 3.1 x 1016 m). Galaxies that rotate have Prot ~ 10-100 Myr at about 100 km/s. The ...
5th_state_of_matter - the Electric Universe!
... emit more heat than 800 000 suns (equ.1). Moreover, these “magnetic tubes” would be strongly deformed via their transport from the dynamo to the surface through the boiling layers (Schrijwer and Title). TRACE clearly shows the parallel flight of iron ions, from surface to surface (Fig.3). The ionisa ...
... emit more heat than 800 000 suns (equ.1). Moreover, these “magnetic tubes” would be strongly deformed via their transport from the dynamo to the surface through the boiling layers (Schrijwer and Title). TRACE clearly shows the parallel flight of iron ions, from surface to surface (Fig.3). The ionisa ...
doc - Jnoodle
... displacement law" or sometimes for short "Wien's constant" and should be assigned units: 2.90 x 103 Km (kelvinmeters). It is rarely given any symbol, but one can be assigned to it at will. This law means that the hotter something gets, the shorter the wavelength (or the higher the frequency) of the ...
... displacement law" or sometimes for short "Wien's constant" and should be assigned units: 2.90 x 103 Km (kelvinmeters). It is rarely given any symbol, but one can be assigned to it at will. This law means that the hotter something gets, the shorter the wavelength (or the higher the frequency) of the ...
instructional package - Horry Georgetown Technical College
... Discussing some possible explanations for the existence of the spiral arms observed in our own and many other galaxies. Explaining what studies of Galactic rotation reveal about the size and mass of our Galaxy, and ...
... Discussing some possible explanations for the existence of the spiral arms observed in our own and many other galaxies. Explaining what studies of Galactic rotation reveal about the size and mass of our Galaxy, and ...
CH. 7 - science1d
... objects again becomes so great that even the AU is too small to be a useful unit of measure. For these immense distances, astronomers usually use a distance measure called the light-year. One light-year (ly) equals the distance that a beam of light can travel through space in 1 year. It is equivalen ...
... objects again becomes so great that even the AU is too small to be a useful unit of measure. For these immense distances, astronomers usually use a distance measure called the light-year. One light-year (ly) equals the distance that a beam of light can travel through space in 1 year. It is equivalen ...
Test #4
... c) The source of energy must be relatively small. d) The energy source must be rapidly rotating. ...
... c) The source of energy must be relatively small. d) The energy source must be rapidly rotating. ...
telescope as time machine - Galaxy Evolution Explorer
... How will scientists know how old the light is that GALEX is receiving? Scientists know that the universe is expanding. Like a chocolate chip cake in the oven, space is the “cake batter” that keeps getting bigger and bigger, while the stars and galaxies are the “chocolate chips” that keep getting far ...
... How will scientists know how old the light is that GALEX is receiving? Scientists know that the universe is expanding. Like a chocolate chip cake in the oven, space is the “cake batter” that keeps getting bigger and bigger, while the stars and galaxies are the “chocolate chips” that keep getting far ...
Shedding Light on Relativity - DCC
... remaining fuel Core collapses to form neutron star Collapsing material bounces and blows off outer regions of star As bright as an entire galaxy for a few days ...
... remaining fuel Core collapses to form neutron star Collapsing material bounces and blows off outer regions of star As bright as an entire galaxy for a few days ...
Physivd Preliminary Module 8.5 The Cosmic Engine
... Explain why the equator receives the most light and the amount of light reduces going to higher latitudes using diagrams. relate the model of the solar system to the observed sky examine information collected to assist in predicting events such as appearances of comets, eclipses and other solar sy ...
... Explain why the equator receives the most light and the amount of light reduces going to higher latitudes using diagrams. relate the model of the solar system to the observed sky examine information collected to assist in predicting events such as appearances of comets, eclipses and other solar sy ...
The Great Debate - The Story Behind The Science
... Judging his evidence for an enormous Milky Way credible, Shapley could then tack on the implication that nothing existed outside its boundaries, not even island universes. Shapley was inexperienced at the lecture podium but knew that many scientists unfamiliar with astronomy filled the hall. He thus ...
... Judging his evidence for an enormous Milky Way credible, Shapley could then tack on the implication that nothing existed outside its boundaries, not even island universes. Shapley was inexperienced at the lecture podium but knew that many scientists unfamiliar with astronomy filled the hall. He thus ...
Living Things - Fairfield-Suisun Unified School District
... Four Views of the Crab Nebula Different type of telescopes collect electromagnetic radiation at different wavelengths. Astronomers are able to learn a great deal about the Crab Nebula by examining these different images. The images are shown at different scales. ...
... Four Views of the Crab Nebula Different type of telescopes collect electromagnetic radiation at different wavelengths. Astronomers are able to learn a great deal about the Crab Nebula by examining these different images. The images are shown at different scales. ...
Introduction to Dark Matter
... in the study of dark matter. The notion that gravity can bend rays of light was proposed already by Newton, although the magnitude of this effect cannot be correctly predicted by Newtonian gravity. Instead, the full machinery of Einstein´s theory of general relativity is required. In 1919, Eddington ...
... in the study of dark matter. The notion that gravity can bend rays of light was proposed already by Newton, although the magnitude of this effect cannot be correctly predicted by Newtonian gravity. Instead, the full machinery of Einstein´s theory of general relativity is required. In 1919, Eddington ...
Astrophysics Questions (DRAFT)
... assumptions that go into deriving it. De ne the Roche limit. 82. What is the Shakura-Sunyaev model (alpha-disk model) for accretion disks? What are the assumptions that go into its derivation? 83. Show from a simple dimensional analysis how the e ective temperature of an accretion disk depends on ac ...
... assumptions that go into deriving it. De ne the Roche limit. 82. What is the Shakura-Sunyaev model (alpha-disk model) for accretion disks? What are the assumptions that go into its derivation? 83. Show from a simple dimensional analysis how the e ective temperature of an accretion disk depends on ac ...
Physical cosmology
Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate. For most of human history, it was a branch of metaphysics and religion. Cosmology as a science originated with the Copernican principle, which implies that celestial bodies obey identical physical laws to those on Earth, and Newtonian mechanics, which first allowed us to understand those physical laws.Physical cosmology, as it is now understood, began with the development in 1915 of Albert Einstein's general theory of relativity, followed by major observational discoveries in the 1920s: first, Edwin Hubble discovered that the universe contains a huge number of external galaxies beyond our own Milky Way; then, work by Vesto Slipher and others showed that the universe is expanding. These advances made it possible to speculate about the origin of the universe, and allowed the establishment of the Big Bang Theory, by Georges Lemaitre, as the leading cosmological model. A few researchers still advocate a handful of alternative cosmologies; however, most cosmologists agree that the Big Bang theory explains the observations better.Dramatic advances in observational cosmology since the 1990s, including the cosmic microwave background, distant supernovae and galaxy redshift surveys, have led to the development of a standard model of cosmology. This model requires the universe to contain large amounts of dark matter and dark energy whose nature is currently not well understood, but the model gives detailed predictions that are in excellent agreement with many diverse observations.Cosmology draws heavily on the work of many disparate areas of research in theoretical and applied physics. Areas relevant to cosmology include particle physics experiments and theory, theoretical and observational astrophysics, general relativity, quantum mechanics, and plasma physics.