Galaxies
... • Does the Universe have a beginning? An end? What physics processes “caused” the Universe to be what it is? Are other universes possible? Would they look like ours (have the same physics)? • Cosmological Principle - the Universe appears the same from any location - Isotropic - no center -no edge ...
... • Does the Universe have a beginning? An end? What physics processes “caused” the Universe to be what it is? Are other universes possible? Would they look like ours (have the same physics)? • Cosmological Principle - the Universe appears the same from any location - Isotropic - no center -no edge ...
Age Estimates of Globular Clusters in the Milky Way
... stellar evolution were performed, as well as refined estimates of the parameters that govern stellar evolution, the lower limit on globular cluster ages progressively decreased, so that a wide range of cosmological models produced Hubble ages consistent with this lower limit (4 –7). In the interim, ...
... stellar evolution were performed, as well as refined estimates of the parameters that govern stellar evolution, the lower limit on globular cluster ages progressively decreased, so that a wide range of cosmological models produced Hubble ages consistent with this lower limit (4 –7). In the interim, ...
Chapter 1 - Princeton University Press
... the universe was expanding was quite simply, astounding. It caused Einstein to revise his ideas about his field equations of general relativity—to backtrack on the changes he had made in them to produce a static cosmology. The expansion of the universe has profound implications. If the universe were ...
... the universe was expanding was quite simply, astounding. It caused Einstein to revise his ideas about his field equations of general relativity—to backtrack on the changes he had made in them to produce a static cosmology. The expansion of the universe has profound implications. If the universe were ...
Investigate Planets, Stars, Galaxies, and the Universe
... of those galaxies contains more than 100 billion stars. So in order to tally all of the stars in the universe, every person on Earth would have to count five stars per second for the next 10,000 years. Despite that impressive total, in reality matter is rare in the universe. Atoms, as a whole, are f ...
... of those galaxies contains more than 100 billion stars. So in order to tally all of the stars in the universe, every person on Earth would have to count five stars per second for the next 10,000 years. Despite that impressive total, in reality matter is rare in the universe. Atoms, as a whole, are f ...
In 1929, the astronomer Edwin Hubble observed that the light from
... The observations made by Hubble support the idea that the Universe is expanding. This means that galaxies are continually moving away from each other and from the Earth. Figure 2 shows a student using a balloon to model the idea of an expanding Universe. Some dots, which represent galaxies, were ma ...
... The observations made by Hubble support the idea that the Universe is expanding. This means that galaxies are continually moving away from each other and from the Earth. Figure 2 shows a student using a balloon to model the idea of an expanding Universe. Some dots, which represent galaxies, were ma ...
Expanding Earth and Static Universe: Two Papers of 1935
... The quantity D >> r is a measure of the distance over which the gravitational “drag” operates, and ρ is the average density of matter in the universe, which Zwicky took to lie in the interval 10-25 > ρ > 10-31 g cm-3. He found the gravitational-drag explanation to be “in qualitative accordance with ...
... The quantity D >> r is a measure of the distance over which the gravitational “drag” operates, and ρ is the average density of matter in the universe, which Zwicky took to lie in the interval 10-25 > ρ > 10-31 g cm-3. He found the gravitational-drag explanation to be “in qualitative accordance with ...
hanson.pdf
... jump to the true vacuum state in its earliest moments. We also have resolved Olber’s paradox — the fact that the night sky appears black when, in a uniform universe, it would be brilliantly lit — by invoking the Hubble expansion, so that all the galaxies are flying away from each other, leaving enou ...
... jump to the true vacuum state in its earliest moments. We also have resolved Olber’s paradox — the fact that the night sky appears black when, in a uniform universe, it would be brilliantly lit — by invoking the Hubble expansion, so that all the galaxies are flying away from each other, leaving enou ...
X-ray Astronomy and the search for Black Holes
... • The hard X-rays are optical thin, thermal emission from the accreting plasma, as also seen in magnetic and non-magnetic CVs • These symbiotic stars have harder spectra than non-magnetic CVs • Yet they are unlikely to have a magnetic white dwarf • Non-magnetic CVs can have high temperatures if the ...
... • The hard X-rays are optical thin, thermal emission from the accreting plasma, as also seen in magnetic and non-magnetic CVs • These symbiotic stars have harder spectra than non-magnetic CVs • Yet they are unlikely to have a magnetic white dwarf • Non-magnetic CVs can have high temperatures if the ...
Document
... Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher ...
... Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher ...
powerpoint - Physics @ IUPUI
... Unresolved questions • Where is the gas coming from for the star formations? • We expect the gas to leave the void and go to the clusters (and voids end up with only 10% of the normal gas amounts). • Could the clusters be pumping gas back into the void? • Is there more dark matter than expected in ...
... Unresolved questions • Where is the gas coming from for the star formations? • We expect the gas to leave the void and go to the clusters (and voids end up with only 10% of the normal gas amounts). • Could the clusters be pumping gas back into the void? • Is there more dark matter than expected in ...
Chapter 31
... called the Local Group which is roughly 2 million ly in diameter. – There are about 35 known members including the Milky Way and Andromeda Galaxies, but most of are ...
... called the Local Group which is roughly 2 million ly in diameter. – There are about 35 known members including the Milky Way and Andromeda Galaxies, but most of are ...
A timeline of the universe
... the density. Eventually, nuclear fusion occurs, and the star turns on. Astronomers understand how stars form in the current cosmos and know enough to paint the outline for forming the first gener ation of stars. Life in the Dark Ages was not that simple, however. In astronomers’ quest to comprehend ...
... the density. Eventually, nuclear fusion occurs, and the star turns on. Astronomers understand how stars form in the current cosmos and know enough to paint the outline for forming the first gener ation of stars. Life in the Dark Ages was not that simple, however. In astronomers’ quest to comprehend ...
HON 392 - Chapman University
... to properly understand it is to understand God, the Christian God.] The Heavens are All Around. ...
... to properly understand it is to understand God, the Christian God.] The Heavens are All Around. ...
Module 5 Modelling the universe - Pearson Schools and FE Colleges
... A planet is a relatively cold object in a nearly circular orbit around a star. Very little is known about planets other than the planets that orbit around our own star, the Sun. Telescopes only now have sufficient accuracy to detect the slight wobble of some stars as a result of planets rotating aro ...
... A planet is a relatively cold object in a nearly circular orbit around a star. Very little is known about planets other than the planets that orbit around our own star, the Sun. Telescopes only now have sufficient accuracy to detect the slight wobble of some stars as a result of planets rotating aro ...
Advancing Physics A2
... The time dilation factor γ is very close to 1 for v substantially less than c but increases rapidly as v approaches c. We start with a discussion of what is involved in ‘thinking relatively’. In Question 50C Comprehension ‘Thinking relatively’ you have to learn to describe events seen from different ...
... The time dilation factor γ is very close to 1 for v substantially less than c but increases rapidly as v approaches c. We start with a discussion of what is involved in ‘thinking relatively’. In Question 50C Comprehension ‘Thinking relatively’ you have to learn to describe events seen from different ...
An Ancient Universe
... of planet Earth. Some galaxies detector, the picture is also interesting because the only source of illumination is starlight. are so far away that their light (Courtesy Roger Smith/NOAO/AURA/NSF) takes over ten billion years to reach us. As we shall see below, astronomers do not we have for living ...
... of planet Earth. Some galaxies detector, the picture is also interesting because the only source of illumination is starlight. are so far away that their light (Courtesy Roger Smith/NOAO/AURA/NSF) takes over ten billion years to reach us. As we shall see below, astronomers do not we have for living ...
attached file
... Cosmological Principle) it can be shown that the corresponding distortion of space-time (due to the gravitational effects of this matter) can only have one of three forms, as shown schematically in the picture at left. It can be "positively" curved like the surface of a ball and finite in extent; it ...
... Cosmological Principle) it can be shown that the corresponding distortion of space-time (due to the gravitational effects of this matter) can only have one of three forms, as shown schematically in the picture at left. It can be "positively" curved like the surface of a ball and finite in extent; it ...
Frontiers of Physics - Wright State University
... incredible view of the past when looking great distances. We can try to see if the universe was different then—if distant galaxies are more tightly packed or have younger-looking stars, for example, than closer galaxies, in which case there has been an evolution in time. But the problem is that the ...
... incredible view of the past when looking great distances. We can try to see if the universe was different then—if distant galaxies are more tightly packed or have younger-looking stars, for example, than closer galaxies, in which case there has been an evolution in time. But the problem is that the ...
Chapter 34 - mrphysicsportal.net
... incredible view of the past when looking great distances. We can try to see if the universe was different then—if distant galaxies are more tightly packed or have younger-looking stars, for example, than closer galaxies, in which case there has been an evolution in time. But the problem is that the ...
... incredible view of the past when looking great distances. We can try to see if the universe was different then—if distant galaxies are more tightly packed or have younger-looking stars, for example, than closer galaxies, in which case there has been an evolution in time. But the problem is that the ...
Think about the universe
... the gas and dust begin to collapse, forming a cloud. Such clouds of interstellar matter are called nebulae and are really like star nurseries. The Great This nuclear fusion reaction in stars Nebula in the constellation of Orion is a nebula large releases vast amounts of energy. enough to be seen wit ...
... the gas and dust begin to collapse, forming a cloud. Such clouds of interstellar matter are called nebulae and are really like star nurseries. The Great This nuclear fusion reaction in stars Nebula in the constellation of Orion is a nebula large releases vast amounts of energy. enough to be seen wit ...
A n A n c i e n... How Astronomers Know the Vast Scale of Cosmic Time
... of planet Earth. Some galaxies detector, the picture is also interesting because the only source of illumination is starlight. are so far away that their light (Courtesy Roger Smith/NOAO/AURA/NSF) takes over ten billion years to reach us. As we shall see below, astronomers do not we have for living ...
... of planet Earth. Some galaxies detector, the picture is also interesting because the only source of illumination is starlight. are so far away that their light (Courtesy Roger Smith/NOAO/AURA/NSF) takes over ten billion years to reach us. As we shall see below, astronomers do not we have for living ...
Introduction Introduction to to Astrophysics Astrophysics
... approximately 120 km/s. Its distance to earth is approximately 2 million lightyears. in how many years from now will we collide based on these figures? However, as this motion is accelerated due to gravitational interaction, the merger will be much sooner. In about 3 billion years, the two galaxies ...
... approximately 120 km/s. Its distance to earth is approximately 2 million lightyears. in how many years from now will we collide based on these figures? However, as this motion is accelerated due to gravitational interaction, the merger will be much sooner. In about 3 billion years, the two galaxies ...
Section9 - University of Chicago
... last ionized at the surface of last scattering.) In fact, the Universe we see around us today has neutral hydrogen only in dense regions (the disks of spiral galaxies for example) that are self-shielded from these ionizing photons. The outskirts of galaxies and the gas in clusters and groups (the in ...
... last ionized at the surface of last scattering.) In fact, the Universe we see around us today has neutral hydrogen only in dense regions (the disks of spiral galaxies for example) that are self-shielded from these ionizing photons. The outskirts of galaxies and the gas in clusters and groups (the in ...
6 The mysterious universe
... Stability and change: Stars — a life story Movie stars come and go. Some have brief careers while others seem to go on forever. It’s much the same with the stars in the sky. Stars come and go — they don’t last forever. However, their ‘careers’ are usually much longer than those of the movie variety. ...
... Stability and change: Stars — a life story Movie stars come and go. Some have brief careers while others seem to go on forever. It’s much the same with the stars in the sky. Stars come and go — they don’t last forever. However, their ‘careers’ are usually much longer than those of the movie variety. ...
Ultimate fate of the universe
The ultimate fate of the universe is a topic in physical cosmology. Many possible fates are predicted by rival scientific hypotheses, including futures of both finite and infinite duration.Once the notion that the universe started with a rapid inflation nicknamed the Big Bang became accepted by the majority of scientists, the ultimate fate of the universe became a valid cosmological question, one depending upon the physical properties of the mass/energy in the universe, its average density, and the rate of expansion.There is a growing consensus among cosmologists that the universe is flat and will continue to expand forever. The ultimate fate of the universe is dependent on the shape of the universe and what role dark energy will play as the universe ages.