The Milky Way
... Energy Transport Energy generated in the star’s center must be transported to the surface. Physicists know of three ways in which energy can be transported: ...
... Energy Transport Energy generated in the star’s center must be transported to the surface. Physicists know of three ways in which energy can be transported: ...
The Milky Way - Houston Community College System
... Energy Transport Energy generated in the star’s center must be transported to the surface. Physicists know of three ways in which energy can be transported: ...
... Energy Transport Energy generated in the star’s center must be transported to the surface. Physicists know of three ways in which energy can be transported: ...
Universe of Learning Science Briefing: Our Home, the Milky Way
... The Milky Way is Full of Exoplanets! Studying exoplanets helps us to answer many of humanity’s, and NASA’s, biggest questions ...
... The Milky Way is Full of Exoplanets! Studying exoplanets helps us to answer many of humanity’s, and NASA’s, biggest questions ...
The Secrets of Cosmic Grains - Max-Planck
... gases in meteorites because the concentrations involved are often very low. The noble gas mass spectrometer in Mainz operates essentially like this: The gaseous components of the sample are first heated gradually to vaporize them. Chemical methods remove the gases that are not noble gases from the g ...
... gases in meteorites because the concentrations involved are often very low. The noble gas mass spectrometer in Mainz operates essentially like this: The gaseous components of the sample are first heated gradually to vaporize them. Chemical methods remove the gases that are not noble gases from the g ...
Document
... “Expanding Universe” – if there isn’t enough mass in the universe then it will just keep on expending forever. If there is just the right mass in the universe then it will reach a fixed size. ...
... “Expanding Universe” – if there isn’t enough mass in the universe then it will just keep on expending forever. If there is just the right mass in the universe then it will reach a fixed size. ...
Name: Period: _____ Stars Interactives and Activities
... Go to the following website: tinyurl.com/HRInteractive See how good you are at reading the H-R Diagram Analyzing Stars with the H-R Diagram Go to the following website: tinyurl.com/HRApplications Answer the questions about stars on the H-R Diagram. ...
... Go to the following website: tinyurl.com/HRInteractive See how good you are at reading the H-R Diagram Analyzing Stars with the H-R Diagram Go to the following website: tinyurl.com/HRApplications Answer the questions about stars on the H-R Diagram. ...
Formation of the Universe
... contracts a huge explosion occurs. Depending on the size of the star, this explosion is called a nova or supernova. These explosions are so large that they outshine their entire galaxy. Most of these large stars become neutron stars, which are made of incredibly dense material and continue to give o ...
... contracts a huge explosion occurs. Depending on the size of the star, this explosion is called a nova or supernova. These explosions are so large that they outshine their entire galaxy. Most of these large stars become neutron stars, which are made of incredibly dense material and continue to give o ...
Fall Semester Final Study Guide 2014 Chapter 1 Introduction to
... 32. Define an ion. 33. T/F Sodium is an alkali metal. 34. What are the three families of metals? 35. T/F Elements in an element family have similar chemical properties. 36. Why are alkali metals highly reactive? 37. T/F Noble gases are highly reactive. 38. T/F Nobel gases exist as single atoms. 39. ...
... 32. Define an ion. 33. T/F Sodium is an alkali metal. 34. What are the three families of metals? 35. T/F Elements in an element family have similar chemical properties. 36. Why are alkali metals highly reactive? 37. T/F Noble gases are highly reactive. 38. T/F Nobel gases exist as single atoms. 39. ...
PH607lec11
... Because they do not interact with electromagnetism they cannot be seen directly. Because they do not interact with the strong nuclear force they do not react strongly with atomic nuclei. Also, in contrast to MACHOs, there are no known stable particles within the standard model of particle physics th ...
... Because they do not interact with electromagnetism they cannot be seen directly. Because they do not interact with the strong nuclear force they do not react strongly with atomic nuclei. Also, in contrast to MACHOs, there are no known stable particles within the standard model of particle physics th ...
Part 1, Some Basics
... • The masses can be computed from measurements of the orbital period and orbital size of the system • The mass ratio of M1 and M2 is inversely proportional to the distance of stars to the center of mass ...
... • The masses can be computed from measurements of the orbital period and orbital size of the system • The mass ratio of M1 and M2 is inversely proportional to the distance of stars to the center of mass ...
this PDF file
... results of spectral analysis focused on Li and alpha-element abundances for 348 most evolved PTPS giants. Keywords: stars: abundances; late-type stars; planetary systems. ...
... results of spectral analysis focused on Li and alpha-element abundances for 348 most evolved PTPS giants. Keywords: stars: abundances; late-type stars; planetary systems. ...
chapter17StarStuff
... carbon in a shell around the carbon core, and H fuses to He in a shell around the helium layer • This double-shell burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses • With each spike, convection dredges carbon up from core and transports it ...
... carbon in a shell around the carbon core, and H fuses to He in a shell around the helium layer • This double-shell burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses • With each spike, convection dredges carbon up from core and transports it ...
Abundance Trends of Alpha and Fe
... r-process, respectively). The r-process probably can only occur in the death throes of highmass stars, while the s-process is a by-product of He-burning in low-intermediate-mass stars. Globular cluster spectra are most often obtained in the yellow-red spectral regions where cool stars emit most of t ...
... r-process, respectively). The r-process probably can only occur in the death throes of highmass stars, while the s-process is a by-product of He-burning in low-intermediate-mass stars. Globular cluster spectra are most often obtained in the yellow-red spectral regions where cool stars emit most of t ...
Lecture 6: The main sequence
... Fusion is most likely to occur in a particular energy window: the Gamow peak. The higher the charge of the interacting nuclei, the higher the Ekin and T before reactions occur, so light elements fuse at lower T than heavy elements This explains why the different nuclear burning phases in stars (H, H ...
... Fusion is most likely to occur in a particular energy window: the Gamow peak. The higher the charge of the interacting nuclei, the higher the Ekin and T before reactions occur, so light elements fuse at lower T than heavy elements This explains why the different nuclear burning phases in stars (H, H ...
Nuclear Binding Energy
... number of nucleons. The fact peak in the binding energy curve near iron means that either the breakup of heavier nuclei (fission) or the combining of lighter nuclei (fusion) will yield nuclei which are more tightly bound (less mass per nucleon). The binding energies of nucleons are in the range of m ...
... number of nucleons. The fact peak in the binding energy curve near iron means that either the breakup of heavier nuclei (fission) or the combining of lighter nuclei (fusion) will yield nuclei which are more tightly bound (less mass per nucleon). The binding energies of nucleons are in the range of m ...
Nuclear astrophysics: the unfinished quest for the origin of the
... They proposed that the Universe was initially very dense and hot, and that it expanded and cooled to its present state. The elements would then be synthesized during an early time when the temperature and density conditions were appropriate for nuclear reactions to occur [20, 21]. Such a model would ...
... They proposed that the Universe was initially very dense and hot, and that it expanded and cooled to its present state. The elements would then be synthesized during an early time when the temperature and density conditions were appropriate for nuclear reactions to occur [20, 21]. Such a model would ...
printer-friendly sample test questions
... A. less than the outward pressure, so the core and the outer layers of the star both expand, creating a black hole. B. less than the outward pressure, so the core and the outer layers of the star both expand, creating a red giant. C. greater than the outward pressure, so the core and the outer layer ...
... A. less than the outward pressure, so the core and the outer layers of the star both expand, creating a black hole. B. less than the outward pressure, so the core and the outer layers of the star both expand, creating a red giant. C. greater than the outward pressure, so the core and the outer layer ...
Pocket: The Ten Greatest Steps Of The Last Ten Decades
... forth by Fred Hoyle and others during the same time. But what was most spectacular is that they argued that all the heavier elements present on Earth today were formed not during an early, hot and dense state, but rather in previous generations of stars. Hoyle, along with collaborators Willie Fowler ...
... forth by Fred Hoyle and others during the same time. But what was most spectacular is that they argued that all the heavier elements present on Earth today were formed not during an early, hot and dense state, but rather in previous generations of stars. Hoyle, along with collaborators Willie Fowler ...
The Origin of the Universe - Christos N. Hadjichristidis
... A globular cluster is a dense collection of close to a million stars, all of which formed at roughly the same time so they can serve as cosmic clocks The fate of every star depends solely on its initial mass. So what should we look for (Corpses of massive or light stars)? The brightest of white dwar ...
... A globular cluster is a dense collection of close to a million stars, all of which formed at roughly the same time so they can serve as cosmic clocks The fate of every star depends solely on its initial mass. So what should we look for (Corpses of massive or light stars)? The brightest of white dwar ...
the 82nd arthur h. compton lecture series
... of low-mass, there are a lot of binary systems composed of two stars with slightly different masses, yet still “low-mass”. ...
... of low-mass, there are a lot of binary systems composed of two stars with slightly different masses, yet still “low-mass”. ...
ppt file
... Consider a system consisting of two stars with masses m1 and m2 Let r1 and r2 be the position vectors of the two stars with respect to some origin Suppose that this binary system is otherwise isolated… the two stars move under the influence of their mutual ...
... Consider a system consisting of two stars with masses m1 and m2 Let r1 and r2 be the position vectors of the two stars with respect to some origin Suppose that this binary system is otherwise isolated… the two stars move under the influence of their mutual ...
I : Importance of binary stars
... Consider a system consisting of two stars with masses m1 and m2 Let r1 and r2 be the position vectors of the two stars with respect to some origin Suppose that this binary system is otherwise isolated… the two stars move under the influence of their mutual ...
... Consider a system consisting of two stars with masses m1 and m2 Let r1 and r2 be the position vectors of the two stars with respect to some origin Suppose that this binary system is otherwise isolated… the two stars move under the influence of their mutual ...
Stars, Galaxies, and the Universe
... this dust and gas to “clump” together. As these “clumps” gather more atoms (mass), their gravitational attraction to other atoms increases, pulling more atoms into the “clump.” ...
... this dust and gas to “clump” together. As these “clumps” gather more atoms (mass), their gravitational attraction to other atoms increases, pulling more atoms into the “clump.” ...
The Universe
... Supernovas •A ______________, or ___________ ____________ ____________, is one of the most brilliant and powerful objects in the cosmos. –Our galaxy, The Milky Way, should produce one supernova every ...
... Supernovas •A ______________, or ___________ ____________ ____________, is one of the most brilliant and powerful objects in the cosmos. –Our galaxy, The Milky Way, should produce one supernova every ...
Nucleosynthesis
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. It was then that hydrogen and helium formed to become the content of the first stars, and this primeval process is responsible for the present hydrogen/helium ratio of the cosmos.With the formation of stars, heavier nuclei were created from hydrogen and helium by stellar nucleosynthesis, a process that continues today. Some of these elements, particularly those lighter than iron, continue to be delivered to the interstellar medium when low mass stars eject their outer envelope before they collapse to form white dwarfs. The remains of their ejected mass form the planetary nebulae observable throughout our galaxy.Supernova nucleosynthesis within exploding stars by fusing carbon and oxygen is responsible for the abundances of elements between magnesium (atomic number 12) and nickel (atomic number 28). Supernova nucleosynthesis is also thought to be responsible for the creation of rarer elements heavier than iron and nickel, in the last few seconds of a type II supernova event. The synthesis of these heavier elements absorbs energy (endothermic) as they are created, from the energy produced during the supernova explosion. Some of those elements are created from the absorption of multiple neutrons (the R process) in the period of a few seconds during the explosion. The elements formed in supernovas include the heaviest elements known, such as the long-lived elements uranium and thorium.Cosmic ray spallation, caused when cosmic rays impact the interstellar medium and fragment larger atomic species, is a significant source of the lighter nuclei, particularly 3He, 9Be and 10,11B, that are not created by stellar nucleosynthesis.In addition to the fusion processes responsible for the growing abundances of elements in the universe, a few minor natural processes continue to produce very small numbers of new nuclides on Earth. These nuclides contribute little to their abundances, but may account for the presence of specific new nuclei. These nuclides are produced via radiogenesis (decay) of long-lived, heavy, primordial radionuclides such as uranium and thorium. Cosmic ray bombardment of elements on Earth also contribute to the presence of rare, short-lived atomic species called cosmogenic nuclides.