Lecture6
... The night sky is dark This implies that the emission of starlight in the universe must be finite, in space, time or both. This is fundamental test for any cosmological model The Big-bang explains Olbers’s paradox with the finiteness of the lifetime of the Universe and hence of its stars: The univers ...
... The night sky is dark This implies that the emission of starlight in the universe must be finite, in space, time or both. This is fundamental test for any cosmological model The Big-bang explains Olbers’s paradox with the finiteness of the lifetime of the Universe and hence of its stars: The univers ...
Document
... as a framework for how that history made our existence possible. So first we need to know something of the structure and arrangement of this universe whose history we want to describe. Theme - Gaining perspective on how we connect to the universe: we are products of the whole universe, not just our ...
... as a framework for how that history made our existence possible. So first we need to know something of the structure and arrangement of this universe whose history we want to describe. Theme - Gaining perspective on how we connect to the universe: we are products of the whole universe, not just our ...
Document
... the food of the Gods". These words by Ptolemy from around 125 A.D. are handed down together with his famous book The Almagest, the bible of astronomy for some 1500 years. They capture mankind's deep fascination with the movements of the heavens, and the miracles of the physical world. After the Baby ...
... the food of the Gods". These words by Ptolemy from around 125 A.D. are handed down together with his famous book The Almagest, the bible of astronomy for some 1500 years. They capture mankind's deep fascination with the movements of the heavens, and the miracles of the physical world. After the Baby ...
幻灯片 1 - 中国科学院理论物理研究所
... been conjectured that in a holographic universe, dark energy is given by ...
... been conjectured that in a holographic universe, dark energy is given by ...
Black Hole
... Black Hole - a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. ...
... Black Hole - a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. ...
THE BIG BANG THEORY
... • 1960: spectroscopic studies of stars showed that the helium accounted for 20-30% of the mass of stars, the ...
... • 1960: spectroscopic studies of stars showed that the helium accounted for 20-30% of the mass of stars, the ...
Chapter 30 Review
... relationship between the speed at which a galaxy moves and its distance. 1. True 2. False ...
... relationship between the speed at which a galaxy moves and its distance. 1. True 2. False ...
Wh t i C l ? What is Cosmology?
... (does work, but does not dominate (for stars) in current models) ...
... (does work, but does not dominate (for stars) in current models) ...
Project topics
... 2. Electromagnetic spectrum and its importance in astronomy. 3. Spectroscopes and the spectrums of stars. Include information about a spectroscope, spectrums of different gases, the Doppler Effect with emphases on what a”red shift” is, and how Edwin Hubble used the” red shift” to determine stellar d ...
... 2. Electromagnetic spectrum and its importance in astronomy. 3. Spectroscopes and the spectrums of stars. Include information about a spectroscope, spectrums of different gases, the Doppler Effect with emphases on what a”red shift” is, and how Edwin Hubble used the” red shift” to determine stellar d ...
Formation of the Universe Test Review Packet
... 11. Once you’ve reached your conclusion and you’ve accepted your hypothesis, what needs to happen to have it accepted as a theory? ...
... 11. Once you’ve reached your conclusion and you’ve accepted your hypothesis, what needs to happen to have it accepted as a theory? ...
TA`s solution set
... If the universe were also infinitely old, then light would have had time to reach us along all of these sightlines! (If the universe had finite age, the light from sufficiently distant stars would not have had time to reach us and some lines of sight would appear dark.) Since the night sky is, in fa ...
... If the universe were also infinitely old, then light would have had time to reach us along all of these sightlines! (If the universe had finite age, the light from sufficiently distant stars would not have had time to reach us and some lines of sight would appear dark.) Since the night sky is, in fa ...
- MrKowalik.com
... Answer the following questions based on the reading of Topic Origin and the Age of the Universe 1. The Universe is all the space, matter and energy in existence. What is the range of ages of the universe that the majority of scientists think? _______________________ ...
... Answer the following questions based on the reading of Topic Origin and the Age of the Universe 1. The Universe is all the space, matter and energy in existence. What is the range of ages of the universe that the majority of scientists think? _______________________ ...
SOLUTIONS TO PROBLEM SET # 4
... ρair ≈ 1.2 kg/ m3 at sea level at a temperature T = 20◦ C = 68◦ F . (It becomes denser when cooler, and less dense when warmer.) Thus, the density of matter at the time of primordial nucleosynthesis is less than the density of the Earth’s air at sea level, by a factor of a hundred. (Although the uni ...
... ρair ≈ 1.2 kg/ m3 at sea level at a temperature T = 20◦ C = 68◦ F . (It becomes denser when cooler, and less dense when warmer.) Thus, the density of matter at the time of primordial nucleosynthesis is less than the density of the Earth’s air at sea level, by a factor of a hundred. (Although the uni ...
The universe
... Measuring the distance through the universe: The distance between stars are very large, so the distance in the far space are not measured in kilometers, but they are measured in a unit called “light year”. Light year: It is the distance covered by light in one year and it is equal 300000 km per seco ...
... Measuring the distance through the universe: The distance between stars are very large, so the distance in the far space are not measured in kilometers, but they are measured in a unit called “light year”. Light year: It is the distance covered by light in one year and it is equal 300000 km per seco ...
Vocabulary Terms - Dayton Independent Schools
... the theory that the universe started with a big bang, or explosion, and has been expanding ever since ...
... the theory that the universe started with a big bang, or explosion, and has been expanding ever since ...
IOSR Journal of Applied Physics (IOSR-JAP) e-ISSN: 2278-4861.
... governed by the same physical laws and constants throughout most of its extent and history. The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe, which is calculated to have begun 13.798 ± 0.037 billion years ago.[2][3] Observations of a super ...
... governed by the same physical laws and constants throughout most of its extent and history. The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe, which is calculated to have begun 13.798 ± 0.037 billion years ago.[2][3] Observations of a super ...
natsci9+
... universe should have been converted into He4 during this period, and about 75% should have been left as protons (H1) Traces of deuterium, He3, and Li should have been also created, but essentially no heavy elements. Heavy elements observed today must have been made later, in stars. Current astronomi ...
... universe should have been converted into He4 during this period, and about 75% should have been left as protons (H1) Traces of deuterium, He3, and Li should have been also created, but essentially no heavy elements. Heavy elements observed today must have been made later, in stars. Current astronomi ...
Scale of the Cosmos ppt.
... It takes time for the sunlight to travel that distance (even at a speed of 186,000 mi/s) It takes 8 minutes for the sunlight to reach ...
... It takes time for the sunlight to travel that distance (even at a speed of 186,000 mi/s) It takes 8 minutes for the sunlight to reach ...
TheExpansionoftheUniverse
... As technology has improved we have able to more accurately calculate the expansion of the universe. As technology advances people will be able even more accurately find the distance of objects which will define more clearly Hubble’s constant. However this is also a problem as Hubble constant, will c ...
... As technology has improved we have able to more accurately calculate the expansion of the universe. As technology advances people will be able even more accurately find the distance of objects which will define more clearly Hubble’s constant. However this is also a problem as Hubble constant, will c ...
Light Energy, Dark Energy 1. Another View of Olber's Paradox
... 3. Could your answer for #2 be true if the universe were infinitely old? No – if the amount of something is increasing, it can only have been increasing for a certain amount of time. For example, the number of people on Earth is increasing now – but clearly this can't have been going on forever into ...
... 3. Could your answer for #2 be true if the universe were infinitely old? No – if the amount of something is increasing, it can only have been increasing for a certain amount of time. For example, the number of people on Earth is increasing now – but clearly this can't have been going on forever into ...
Unit 3 - Section 9.7 2011 Universe Origin
... Luminosity (i.e., amount of light emitted) is used to determine the size and mass of stars. …and more Scientifically, the size of a galaxy is estimated using, among other measures, luminosity. If I know an object’s luminosity, I can determine its mass. Yet, non-random discrepancies and errors oc ...
... Luminosity (i.e., amount of light emitted) is used to determine the size and mass of stars. …and more Scientifically, the size of a galaxy is estimated using, among other measures, luminosity. If I know an object’s luminosity, I can determine its mass. Yet, non-random discrepancies and errors oc ...
GCSE P1 1.5.4 Red shift
... after exploding suddenly in a Big Bang from a very small initial point, some 13.5 billion years ago. ...
... after exploding suddenly in a Big Bang from a very small initial point, some 13.5 billion years ago. ...
Unit 1
... Bang, only protons and electrons existed Shortly after the BB, temperature and density was high enough for deuterium to form by fusion After 100 seconds or so, temperature cooled enough so that deuterium could fuse into helium nuclei The temperature continued to cool, and fusion stopped after a few ...
... Bang, only protons and electrons existed Shortly after the BB, temperature and density was high enough for deuterium to form by fusion After 100 seconds or so, temperature cooled enough so that deuterium could fuse into helium nuclei The temperature continued to cool, and fusion stopped after a few ...
The Expanding Universe
... Why isn't the night sky uniformly at least as bright as the surface of the Sun? If the Universe has infinitely many stars, then presumably it should be. ( Infinitely old ) After all, if you move the Sun twice as far away from us, we will intercept one quarter as many photons, but the Sun's angular a ...
... Why isn't the night sky uniformly at least as bright as the surface of the Sun? If the Universe has infinitely many stars, then presumably it should be. ( Infinitely old ) After all, if you move the Sun twice as far away from us, we will intercept one quarter as many photons, but the Sun's angular a ...
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.