May 2010 - Pomona Valley Amateur Astronomers
... “How old are they?” The first bit of information we need is the redshift, the value of “Z.” What is it? Hydrogen is the most abundant element in the outer reaches of any star. It is simply a proton with an electron orbiting it. Quantum Physics has explained that the possible orbits are separated by ...
... “How old are they?” The first bit of information we need is the redshift, the value of “Z.” What is it? Hydrogen is the most abundant element in the outer reaches of any star. It is simply a proton with an electron orbiting it. Quantum Physics has explained that the possible orbits are separated by ...
star-formation rate
... • The theory of population synthesis aims at interpreting the spectrum of galaxies as a superposition of stellar spectra. • Change of the stellar distribution over time e.g., massive stars leave the main sequence after several 106 years, the number of luminous blue stars thus decreases, so the spect ...
... • The theory of population synthesis aims at interpreting the spectrum of galaxies as a superposition of stellar spectra. • Change of the stellar distribution over time e.g., massive stars leave the main sequence after several 106 years, the number of luminous blue stars thus decreases, so the spect ...
The Milky Way Galaxy
... Our Galaxy is a collection of stellar and interstellar matter – stars, gas, dust, neutron stars, black holes – held together by gravity. Our view of the Galaxy…. ...
... Our Galaxy is a collection of stellar and interstellar matter – stars, gas, dust, neutron stars, black holes – held together by gravity. Our view of the Galaxy…. ...
MilkyWay
... Our Galaxy is a collection of stellar and interstellar matter – stars, gas, dust, neutron stars, black holes – held together by gravity. Our view of the Galaxy…. ...
... Our Galaxy is a collection of stellar and interstellar matter – stars, gas, dust, neutron stars, black holes – held together by gravity. Our view of the Galaxy…. ...
Lecture 5
... the 109 brightest nebulae (celestial objects with a nebulous appearance), later followed by a larger catalog of 5,000 nebulae assembled by William Herschel. ...
... the 109 brightest nebulae (celestial objects with a nebulous appearance), later followed by a larger catalog of 5,000 nebulae assembled by William Herschel. ...
Slide 1
... the 109 brightest nebulae (celestial objects with a nebulous appearance), later followed by a larger catalog of 5,000 nebulae assembled by William Herschel. ...
... the 109 brightest nebulae (celestial objects with a nebulous appearance), later followed by a larger catalog of 5,000 nebulae assembled by William Herschel. ...
GenGeoAstroII_Stars
... In the beginning there was neither space nor time aswe know them, but a shifting foam of strings and loops, as small as anything can be. Within the foam, all of space, time and energy mingled in a grand unification. But the foam expanded and cooled. And then there was gravity, and space and time, an ...
... In the beginning there was neither space nor time aswe know them, but a shifting foam of strings and loops, as small as anything can be. Within the foam, all of space, time and energy mingled in a grand unification. But the foam expanded and cooled. And then there was gravity, and space and time, an ...
astro2_lec1 - Astronomy & Astrophysics Group
... For many years the prevailing belief was that ellipticals evolve into spirals, from left to right in the tuning fork (although Hubble did not argue for the tuning fork diagram as an evolutionary sequence). ...
... For many years the prevailing belief was that ellipticals evolve into spirals, from left to right in the tuning fork (although Hubble did not argue for the tuning fork diagram as an evolutionary sequence). ...
Chapter 17
... B. they are all at the same distance. C. they are all in the field of view of the galaxy center. D. as a class, they have similar luminosities. 17. The "orbits" of the stars in our galaxy do not follow the laws of Kepler. We understand this to be due to: A. proportionally more mass distributed away ...
... B. they are all at the same distance. C. they are all in the field of view of the galaxy center. D. as a class, they have similar luminosities. 17. The "orbits" of the stars in our galaxy do not follow the laws of Kepler. We understand this to be due to: A. proportionally more mass distributed away ...
EvoluGon of high mass stars Solar-‐type stars end their lives by
... These are stars composed almost en=rely of neutrons, with radii ≈ 10 km, leh over aher a core-‐collapse supernova. They are supported against gravita=onal collapse by neutron degeneracy pressure. Their ...
... These are stars composed almost en=rely of neutrons, with radii ≈ 10 km, leh over aher a core-‐collapse supernova. They are supported against gravita=onal collapse by neutron degeneracy pressure. Their ...
Question 1 The star Regulus, in the constellation Leo, appears
... . 2. elliptical galaxies with bright, starlike nuclei. ...
... . 2. elliptical galaxies with bright, starlike nuclei. ...
the galaxy in which we live - Cosmos
... radiation, and invisible material (dark matter), are gravitationally bound forming a much larger structure: our Milky Way Galaxy. There are huge numbers of galaxies apart from our own, constituting the basic structural units of the Universe. ...
... radiation, and invisible material (dark matter), are gravitationally bound forming a much larger structure: our Milky Way Galaxy. There are huge numbers of galaxies apart from our own, constituting the basic structural units of the Universe. ...
Sirius Astronomer - Orange County Astronomers
... much smaller than the spiral and elliptical galaxies seen today. So over the lifetime of galaxies they must feed on material to make new stars and grow into large galaxies. The new study found that at the start of those adolescent years, smooth gas flows into galaxies were the preferred method of fe ...
... much smaller than the spiral and elliptical galaxies seen today. So over the lifetime of galaxies they must feed on material to make new stars and grow into large galaxies. The new study found that at the start of those adolescent years, smooth gas flows into galaxies were the preferred method of fe ...
Volcanoes and Igneous Activity Earth
... • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young stars. ...
... • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young stars. ...
Star and Galaxies
... • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young stars. ...
... • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young stars. ...
Chapter 17
... he focused a huge telescope on an object thought to be a nebula in the constellation Andromeda, Hubble could see that the “nebula” actually consisted of faint, distant stars. He named the object the Andromeda galaxy. Just since Hubble’s time (1889-1953), astronomers have discovered a large number of ...
... he focused a huge telescope on an object thought to be a nebula in the constellation Andromeda, Hubble could see that the “nebula” actually consisted of faint, distant stars. He named the object the Andromeda galaxy. Just since Hubble’s time (1889-1953), astronomers have discovered a large number of ...
dm curvas de rotacion
... The orbital velocity of stars can be measured using the Doppler shift. ...
... The orbital velocity of stars can be measured using the Doppler shift. ...
Dark Matter - UW - Laramie, Wyoming | University of Wyoming
... • In 1933, Fritz Zwicky checked out the Coma Cluster. The galaxies were flying around too fast (as measured by the Doppler effect) for their visible mass to keep them together, so he proposed dark matter was present. ...
... • In 1933, Fritz Zwicky checked out the Coma Cluster. The galaxies were flying around too fast (as measured by the Doppler effect) for their visible mass to keep them together, so he proposed dark matter was present. ...
Review Sheet and Study Hints - Tufts Institute of Cosmology
... draw evolutionary tracks in the HRD for stars of different masses comment on relative evolutionary time-scales globular cluster HRD’s main sequence turnoff and ages distance determinations use the HRD to determine star-formation histories in galaxies ...
... draw evolutionary tracks in the HRD for stars of different masses comment on relative evolutionary time-scales globular cluster HRD’s main sequence turnoff and ages distance determinations use the HRD to determine star-formation histories in galaxies ...
HW #8 Answers (Due 10/21)
... Cloud collision with spiral arms – As molecular clouds orbit in a spiral galaxy they pass they periodically pass through an over density of gas which is related to the spiral density wave in the galaxy. When this happens, the interaction between the cloud and the spiral density wave can compress a c ...
... Cloud collision with spiral arms – As molecular clouds orbit in a spiral galaxy they pass they periodically pass through an over density of gas which is related to the spiral density wave in the galaxy. When this happens, the interaction between the cloud and the spiral density wave can compress a c ...
Measuring the Milky Way
... These objects are very close to the Galactic center. The orbit on the right is the best fit; it assumes a central black hole of 3.7 million solar masses. ...
... These objects are very close to the Galactic center. The orbit on the right is the best fit; it assumes a central black hole of 3.7 million solar masses. ...
June 2013 Kepler Space Telescope Update
... "We were concerned that HXMM01's intense brightness at sub-millimetre wavelengths might be due to gravitational lensing – the bending of light caused by foreground massive objects. In some cases, that can strongly magnify the appearance of a background galaxy," explains co-author Asantha Cooray, als ...
... "We were concerned that HXMM01's intense brightness at sub-millimetre wavelengths might be due to gravitational lensing – the bending of light caused by foreground massive objects. In some cases, that can strongly magnify the appearance of a background galaxy," explains co-author Asantha Cooray, als ...
neutron star - Livonia Public Schools
... Types of Galaxies Irregular Galaxies • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young s ...
... Types of Galaxies Irregular Galaxies • Only 10 percent of the known galaxies have irregular shapes and are classified as irregular galaxies. • In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. Irregular galaxies contain young s ...
Galactic Evolution:
... Milky Way, thus, planetary systems forming in other locations and times in the Milky Way with the same metallicity as the Sun will not necessarily form habitable Earth like planets. As a result of the radial Galactic metafficity gradient, the outer limit of the GHZ is set primarily by the minimum re ...
... Milky Way, thus, planetary systems forming in other locations and times in the Milky Way with the same metallicity as the Sun will not necessarily form habitable Earth like planets. As a result of the radial Galactic metafficity gradient, the outer limit of the GHZ is set primarily by the minimum re ...
Galaxy
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A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas and dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally ""milky"", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few thousand (103) stars to giants with one hundred trillion (1014) stars, each orbiting their galaxy's own center of mass. Galaxies are categorized according to their visual morphology, including elliptical, spiral, and irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than our own Sun. As of July 2015, EGSY8p7 is the oldest and most distant galaxy with a light travel distance of 13.2 billion light-years from Earth, and observed as it existed 570 million years after the Big Bang. Previously, as of May 2015, EGS-zs8-1 was the most distant known galaxy, estimated to have a light travel distance of 13.1 billion light-years away and to have 15% of the mass of the Milky Way.Approximately 170 billion (1.7 × 1011) to 200 billion (2.0 × 1011) galaxies exist in the observable universe. Most of the galaxies are 1,000 to 100,000 parsecs in diameter and usually separated by distances on the order of millions of parsecs (or megaparsecs). The space between galaxies is filled with a tenuous gas with an average density less than one atom per cubic meter. The majority of galaxies are gravitationally organized into associations known as galaxy groups, clusters, and superclusters. At the largest scale, these associations are generally arranged into sheets and filaments that are surrounded by immense voids.