Lecture 9
... This marks the Big Bang, or start of the Universe. Currently, science cannot answer what caused this event. But science can describe the universe in detail from 10-43 seconds after the event to the present day! ...
... This marks the Big Bang, or start of the Universe. Currently, science cannot answer what caused this event. But science can describe the universe in detail from 10-43 seconds after the event to the present day! ...
universe - Global Change
... unstable forms. As the temperature cooled in the first second, free hydrogen nuclei (atomic mass 1) were formed that could undergo fusion reactions to give heavier forms of hydrogen (atomic mass 2, 3) and helium (atomic mass 3 and 4). The lack of stable nuclei of atomic mass 5 and rapidly dropping t ...
... unstable forms. As the temperature cooled in the first second, free hydrogen nuclei (atomic mass 1) were formed that could undergo fusion reactions to give heavier forms of hydrogen (atomic mass 2, 3) and helium (atomic mass 3 and 4). The lack of stable nuclei of atomic mass 5 and rapidly dropping t ...
Cosmology – The Origin and Evolution of the Universe
... everything around us was part of the Big Bang, and it all carries clues… ...
... everything around us was part of the Big Bang, and it all carries clues… ...
GCSE P1 1.5.4 Red shift
... (c) What does the shift in wavelength which you have named in (b) tell us about the motion of distant galaxies? ...
... (c) What does the shift in wavelength which you have named in (b) tell us about the motion of distant galaxies? ...
solutions
... of the Universe must be equal to a certain critical density. The total amount of matter in the Universe (including baryons and dark matter), as measured by the CMB, accounts for only about 30% of the critical density. This implies the existence of an additional form of energy to account for the rema ...
... of the Universe must be equal to a certain critical density. The total amount of matter in the Universe (including baryons and dark matter), as measured by the CMB, accounts for only about 30% of the critical density. This implies the existence of an additional form of energy to account for the rema ...
PP and CNO-Cycle Nucleosynthesis
... It should not be surprising to the reader that most of the relevant thermonuclear reactions studied in astrophysics are exothermic; the energy of particles in the exit channel is much greater than in the entrance channel (if the converse of this statement were true, perhaps there would be no humans ...
... It should not be surprising to the reader that most of the relevant thermonuclear reactions studied in astrophysics are exothermic; the energy of particles in the exit channel is much greater than in the entrance channel (if the converse of this statement were true, perhaps there would be no humans ...
wdm_shanghai_Mayinzhe
... For m_X > 5keV, star formation efficiency is degenerated with WDM For low mass, the two are not degenerated. This is observable by the high-redshift measurement such as square kilometer array (2020). ...
... For m_X > 5keV, star formation efficiency is degenerated with WDM For low mass, the two are not degenerated. This is observable by the high-redshift measurement such as square kilometer array (2020). ...
Chap 18 Cosmology v2
... In its first 30,000 years, the universe was radiation dominated, during which time photons prevented matter from forming clumps. Then it was matter-dominated, during which time superclusters and smaller clumps of matter formed. Today it is dark-energy-dominated. Dark energy of some sort supplies a r ...
... In its first 30,000 years, the universe was radiation dominated, during which time photons prevented matter from forming clumps. Then it was matter-dominated, during which time superclusters and smaller clumps of matter formed. Today it is dark-energy-dominated. Dark energy of some sort supplies a r ...
ppt document
... Dark Matter The amount of visible mass (from stars) right now accounts for only about 10% of the mass necessary to have a finite (closed) universe. However, when we look at the motions of the galaxies, we find that there appears to be more mass in them than the stars can account for. This “dark mat ...
... Dark Matter The amount of visible mass (from stars) right now accounts for only about 10% of the mass necessary to have a finite (closed) universe. However, when we look at the motions of the galaxies, we find that there appears to be more mass in them than the stars can account for. This “dark mat ...
Lecture 21-Hot Big Bang
... The night sky is dark, with a few glowing stars. (This accounts for the relative unpopularity of spray deodorants. Woohoo, that’s cold!) ...
... The night sky is dark, with a few glowing stars. (This accounts for the relative unpopularity of spray deodorants. Woohoo, that’s cold!) ...
10.1
... the theory, the Big Bang event gave rise to all the energy and matter in the universe. ● ...
... the theory, the Big Bang event gave rise to all the energy and matter in the universe. ● ...
P1b revision - Portland Place School
... If starlight shows a lengthening of wavelength ( decrease of frequency ) it must mean the star or galaxy is moving away from us. 9. Big Bang theory states the Universe is expanding and at the beginning of time it must have been in a small space. is backed up by observations of red shift in 196 ...
... If starlight shows a lengthening of wavelength ( decrease of frequency ) it must mean the star or galaxy is moving away from us. 9. Big Bang theory states the Universe is expanding and at the beginning of time it must have been in a small space. is backed up by observations of red shift in 196 ...
Kinetics and Numerical Modeling of Competitive Fusion Processes
... the relevant thermonuclear reactions studied in astrophysics are exothermic; the energy of particles in the exit channel is much greater than in the entrance channel (if the converse of this statement were true, perhaps there would be no humans alive today to discuss it!). The exothermic nature of r ...
... the relevant thermonuclear reactions studied in astrophysics are exothermic; the energy of particles in the exit channel is much greater than in the entrance channel (if the converse of this statement were true, perhaps there would be no humans alive today to discuss it!). The exothermic nature of r ...
Lecture 16: Iron Core Collapse, Neutron Stars
... •As the temperature exceeds about 10 x 109 K, the typical photons on the blackbody have energy ~ 3 MeV (3 kT). Photons further out on the tail have enough energy (~8 MeV) to begin to rip nuclei apart. The process does not go to completion but about 10% helium by mass is “boiled” out of the iron and ...
... •As the temperature exceeds about 10 x 109 K, the typical photons on the blackbody have energy ~ 3 MeV (3 kT). Photons further out on the tail have enough energy (~8 MeV) to begin to rip nuclei apart. The process does not go to completion but about 10% helium by mass is “boiled” out of the iron and ...
April 2006 - Otterbein University
... • Cosmology is one of the most exciting subfields of physics these days • The is an intimate connection between cosmology and particle physics • We live in a “golden age” of cosmology: lots of data available and being measured • Today’s era is that of “precision cosmology” • There is lot’s we don’t ...
... • Cosmology is one of the most exciting subfields of physics these days • The is an intimate connection between cosmology and particle physics • We live in a “golden age” of cosmology: lots of data available and being measured • Today’s era is that of “precision cosmology” • There is lot’s we don’t ...
ASTRONOMY 220C ADVANCED STAGES OF
... explosions, but also their nucleosynthesis, spectra, and light curves. The student is expected to be familiar with material presented in Ay 220A, and thus to already know the essentials of stellar physics and evolution, as well as basic quantum mechanics and statistical mechanics. The course materia ...
... explosions, but also their nucleosynthesis, spectra, and light curves. The student is expected to be familiar with material presented in Ay 220A, and thus to already know the essentials of stellar physics and evolution, as well as basic quantum mechanics and statistical mechanics. The course materia ...
Powerpoint for today
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
mass of star
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
... Temperature of background in opposite directions nearly identical. Yet even light hasn't had time to travel from A to B (only A to Earth), so A can know nothing about conditions at B, and vice versa. So why are A and B almost identical? This is “horizon problem”. ...
Document
... Synthesis of Helium •Energy is required to convert protons to neutrons. •At T < 1010 K, only neutrons can be changed into protons. •However, fusion continued to operate ...
... Synthesis of Helium •Energy is required to convert protons to neutrons. •At T < 1010 K, only neutrons can be changed into protons. •However, fusion continued to operate ...
The Universe - IES Alyanub
... explosion happens it pushes outwards (think of movies). This caused the universe to expand and it is believed that the universe continues to expand. This expansion means that these galaxies mentioned above are moving away from each other. And this has been observed by astronomers; providing evidence ...
... explosion happens it pushes outwards (think of movies). This caused the universe to expand and it is believed that the universe continues to expand. This expansion means that these galaxies mentioned above are moving away from each other. And this has been observed by astronomers; providing evidence ...
Section 19.3
... In the 1960s, Arno Penzias and Robert Wilson, two American astrophysicists, were trying to measure electromagnetic waves given off by the Milky Way. No matter how they refined their technique, they kept detecting a background noise that interfered with their observations. The “noise” these scientist ...
... In the 1960s, Arno Penzias and Robert Wilson, two American astrophysicists, were trying to measure electromagnetic waves given off by the Milky Way. No matter how they refined their technique, they kept detecting a background noise that interfered with their observations. The “noise” these scientist ...
04 Astrophysics_-_lesson_4 cosmology
... that the spectra of distant galaxies showed a redshift, which means that they are moving away from Earth. So, if galaxies are moving away from each other then it they may have been much closer together in the past ...
... that the spectra of distant galaxies showed a redshift, which means that they are moving away from Earth. So, if galaxies are moving away from each other then it they may have been much closer together in the past ...
Universe Standards - Harvard
... B. Stated Concept: “On the basis of scientific evidence, the universe is estimated to be over ten billion years old. The current theory is that its entire contents expanded explosively from a hot, dense, chaotic mass. Stars condensed by gravity out of clouds of molecules of the lightest elements unt ...
... B. Stated Concept: “On the basis of scientific evidence, the universe is estimated to be over ten billion years old. The current theory is that its entire contents expanded explosively from a hot, dense, chaotic mass. Stars condensed by gravity out of clouds of molecules of the lightest elements unt ...