Study Guide 4 Part A Outline
... The expansion started at some definite time in the past (the Big Bang)Universe expands away from every galaxy. Every galaxy would see its own version of the Hubble Law. Quasars & Active Galactic Nuclei o Quasars and other active galaxies emit large amounts of energy from relatively small regions n ...
... The expansion started at some definite time in the past (the Big Bang)Universe expands away from every galaxy. Every galaxy would see its own version of the Hubble Law. Quasars & Active Galactic Nuclei o Quasars and other active galaxies emit large amounts of energy from relatively small regions n ...
Lecture 2
... Stars are held together by gravitation – attraction exerted on each part of the star by all other parts Collapse is resisted by internal thermal pressure. These two forces play the principal role in determining stellar structure – they must be (at least almost) in balance Thermal properties of stars ...
... Stars are held together by gravitation – attraction exerted on each part of the star by all other parts Collapse is resisted by internal thermal pressure. These two forces play the principal role in determining stellar structure – they must be (at least almost) in balance Thermal properties of stars ...
MSci Astrophysics 210PHY412 - QUB Astrophysics Research Centre
... Stars are held together by gravitation – attraction exerted on each part of the star by all other parts Collapse is resisted by internal thermal pressure. These two forces play the principal role in determining stellar structure – they must be (at least almost) in balance Thermal properties of stars ...
... Stars are held together by gravitation – attraction exerted on each part of the star by all other parts Collapse is resisted by internal thermal pressure. These two forces play the principal role in determining stellar structure – they must be (at least almost) in balance Thermal properties of stars ...
Introduction to pulsars - Pulsar Search Collaboratory
... Once the universe was created by the Big Bang, the only abundant elements present were hydrogen (H) and helium (He). ...
... Once the universe was created by the Big Bang, the only abundant elements present were hydrogen (H) and helium (He). ...
3. Galactic Dynamics handout 3 Aim: understand equilibrium of
... 2) How empty are galaxies ? Calculate the distance between neighbor stars, and get the radius of a sun from literature. Take the ratio of the two. Compare this to the same ratio of galaxies: take the average distance between neighbor galaxies, and the radius of galaxies. ...
... 2) How empty are galaxies ? Calculate the distance between neighbor stars, and get the radius of a sun from literature. Take the ratio of the two. Compare this to the same ratio of galaxies: take the average distance between neighbor galaxies, and the radius of galaxies. ...
SHELL H II REGIONS IN NGC 6334
... • Orbital motions in protostars will provide important constraints on the early phases of stellar evolution • We are getting reasonable results, but must follow “strange” cases such as IRAS 162932422 ...
... • Orbital motions in protostars will provide important constraints on the early phases of stellar evolution • We are getting reasonable results, but must follow “strange” cases such as IRAS 162932422 ...
Centimeter and Millimeter Observations of Very Young Binary Systems
... • Orbital motions in protostars will provide important constraints on the early phases of stellar evolution • We are getting reasonable results, but must follow “strange” cases such as IRAS 162932422 ...
... • Orbital motions in protostars will provide important constraints on the early phases of stellar evolution • We are getting reasonable results, but must follow “strange” cases such as IRAS 162932422 ...
Lecture 10: Interstellar gas
... Although grains make up a very small fraction of the total IS medium, they influence the form of the gas. Grains are probably the sites of molecule formation for some of the simpler molecules (at least H2). Their surfaces act as catalysts by allowing atoms (or simple molecules) to stick to them so t ...
... Although grains make up a very small fraction of the total IS medium, they influence the form of the gas. Grains are probably the sites of molecule formation for some of the simpler molecules (at least H2). Their surfaces act as catalysts by allowing atoms (or simple molecules) to stick to them so t ...
L2 - QUB Astrophysics Research Centre
... Stars are held together by gravitation – attraction exerted on each part of the star by all other parts Collapse is resisted by internal thermal pressure. These two forces play the principal role in determining stellar structure – they must be (at least almost) in balance Thermal properties of stars ...
... Stars are held together by gravitation – attraction exerted on each part of the star by all other parts Collapse is resisted by internal thermal pressure. These two forces play the principal role in determining stellar structure – they must be (at least almost) in balance Thermal properties of stars ...
Stars and The Universe
... outer layers. It all starts with center of the sun? hydrogen fusion… When atoms fuse, their product is a heavier, denser The fusion process continues material. Denser materials sink. until iron is created. Even in a massive star there is not enough pressure for iron nuclei to fuse. ...
... outer layers. It all starts with center of the sun? hydrogen fusion… When atoms fuse, their product is a heavier, denser The fusion process continues material. Denser materials sink. until iron is created. Even in a massive star there is not enough pressure for iron nuclei to fuse. ...
DOC - Cool Cosmos
... Simply put, a star is a large amount of gas and dust that is collapsing under the force of gravity. At first, this crush of gravity makes the inside of the star hot enough to ignite a nuclear explosion. This explosion supports the star against gravity and makes it shine. In our Sun's case, this stag ...
... Simply put, a star is a large amount of gas and dust that is collapsing under the force of gravity. At first, this crush of gravity makes the inside of the star hot enough to ignite a nuclear explosion. This explosion supports the star against gravity and makes it shine. In our Sun's case, this stag ...
![Global Warming_Notes_for_Test_Review[1]](http://s1.studyres.com/store/data/009490554_1-1d4a9735243ab8423aa4808909f160ae-300x300.png)
Global Warming_Notes_for_Test_Review[1]
... 7. When particles from the sun collide with air molecules in the upper atmosphere around the poles, they produce the aurora borealis or northern lights. True 8. The Bay of Fundy has the largest tides in the world. True 9. In most places around the world, there are four high tides and four low tides ...
... 7. When particles from the sun collide with air molecules in the upper atmosphere around the poles, they produce the aurora borealis or northern lights. True 8. The Bay of Fundy has the largest tides in the world. True 9. In most places around the world, there are four high tides and four low tides ...
White Dwarfs - Indiana University
... – All WDs have a common origin (PNN) with some hydrogen, upper limit of 10-4 solar masses to 10-15 solar masses of hydrogen (recall that 10-4 is the limit where H burning stops) – Only about 10-15 is needed to produce an optically thick H layer at the surface – Diffusion brings H to surface; by Teff ...
... – All WDs have a common origin (PNN) with some hydrogen, upper limit of 10-4 solar masses to 10-15 solar masses of hydrogen (recall that 10-4 is the limit where H burning stops) – Only about 10-15 is needed to produce an optically thick H layer at the surface – Diffusion brings H to surface; by Teff ...
The correct answers are written in bold, italic and underlined. The
... • At the very bottom of the main sequence, massive stars being cool because of their great mass • At the very top of the main sequence, massive stars being very hot and active • In the middle of the main sequence, with very hot but less massive stars positioned higher and massive red giant stars pos ...
... • At the very bottom of the main sequence, massive stars being cool because of their great mass • At the very top of the main sequence, massive stars being very hot and active • In the middle of the main sequence, with very hot but less massive stars positioned higher and massive red giant stars pos ...
Stars - MrCrabtreesScience
... deadly gamma rays. • Event Horizon – Distance from the center of the black hole beyond which nothing can escape ...
... deadly gamma rays. • Event Horizon – Distance from the center of the black hole beyond which nothing can escape ...
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please
... highlands. The planets of the solar system formed in an accretion disk around the infant Sun. Nuclear reaction rates inside stars increase rapidly with temperature. Stars lose significant amounts of mass during their lifetime. ...
... highlands. The planets of the solar system formed in an accretion disk around the infant Sun. Nuclear reaction rates inside stars increase rapidly with temperature. Stars lose significant amounts of mass during their lifetime. ...
The Sky is Our Laboratory
... What are the theories about black holes? Where do quasars come into the picture? What is a quasar? What is the big, main bright core in the middle of galaxies? How many different types of galaxies are there? What is the Local Group? What is a satellite galaxy? What will eventually happen to the Univ ...
... What are the theories about black holes? Where do quasars come into the picture? What is a quasar? What is the big, main bright core in the middle of galaxies? How many different types of galaxies are there? What is the Local Group? What is a satellite galaxy? What will eventually happen to the Univ ...
the spectrum of a partially ionized jet sodium ionization in t
... structure of bright, quasi-periodic knots, a very low excitation spectrum (red [S II] to Ha line ratios of 1-10). Assuming that the latter are indicative of the structure of a supersonic jet, we have made a detailed prediction of the emission line spectrum within each radiating knot using the multi- ...
... structure of bright, quasi-periodic knots, a very low excitation spectrum (red [S II] to Ha line ratios of 1-10). Assuming that the latter are indicative of the structure of a supersonic jet, we have made a detailed prediction of the emission line spectrum within each radiating knot using the multi- ...
1 Astronomical Measurements and Quantities 2 Astronomical Objects
... method. A brief overview of different methods treated through the course to go from very nearby objects to very distant ones. [K],[BM] Galaxy Clusters: Morphological classification. Main properties. Clusters as multicomponent objects and their multivawelenght observations: optical, X-ray, gravitatio ...
... method. A brief overview of different methods treated through the course to go from very nearby objects to very distant ones. [K],[BM] Galaxy Clusters: Morphological classification. Main properties. Clusters as multicomponent objects and their multivawelenght observations: optical, X-ray, gravitatio ...
Stability and formation of the fractal
... •Difficult to measure the total gas, especially the CO/H2 conversion ratio not known within a factor 2 •Time delay for the feed-back? •Instabilities: formation of structures, or stars? ...
... •Difficult to measure the total gas, especially the CO/H2 conversion ratio not known within a factor 2 •Time delay for the feed-back? •Instabilities: formation of structures, or stars? ...
Lives of stars HR
... When a higher mass star can no longer produce internal pressure, it ejects the envelope in a violent explosion called a supernova. Supernova are so bright they can shine brighter than an entire galaxy, and they can be seen across the visible universe. ...
... When a higher mass star can no longer produce internal pressure, it ejects the envelope in a violent explosion called a supernova. Supernova are so bright they can shine brighter than an entire galaxy, and they can be seen across the visible universe. ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.