The Mass Assembly of Galaxies
... There is a cluster of B stars in the central 1’’ of the galaxy, the so-called S-cluster. These high proper motion stars - in particular star S2 - show that Sgr A* is a black-hole of 3-4 million solar masses. Large numbers of young stars, in particular O supergiants and WR stars are observed within 2 ...
... There is a cluster of B stars in the central 1’’ of the galaxy, the so-called S-cluster. These high proper motion stars - in particular star S2 - show that Sgr A* is a black-hole of 3-4 million solar masses. Large numbers of young stars, in particular O supergiants and WR stars are observed within 2 ...
Outline 8: History of the Universe and Solar System
... Total time is 5 hours. Total distance is 380 miles. If you were observed traveling at 60 mph and had covered 380 miles, the assumption would be made that you had traveled for 6 hours and 20 minutes (380miles/60mph) rather than 5 hours. ...
... Total time is 5 hours. Total distance is 380 miles. If you were observed traveling at 60 mph and had covered 380 miles, the assumption would be made that you had traveled for 6 hours and 20 minutes (380miles/60mph) rather than 5 hours. ...
Universe and Galaxy Short Study Guide
... Black holes in the centers of giant galaxies—some more than one billion solar masses—had enough infalling gas to once blaze as quasars. The final mass of a black hole is not primordial, but instead is determined during the galaxy formation process. This shows that there is a close relationship betwe ...
... Black holes in the centers of giant galaxies—some more than one billion solar masses—had enough infalling gas to once blaze as quasars. The final mass of a black hole is not primordial, but instead is determined during the galaxy formation process. This shows that there is a close relationship betwe ...
The Milky Way
... • How do we know the distance to stars and clusters in our galaxy? • Stellar parallax: – Parallax of nearby stars relative to background stars. – Good out to ~500 pc. ...
... • How do we know the distance to stars and clusters in our galaxy? • Stellar parallax: – Parallax of nearby stars relative to background stars. – Good out to ~500 pc. ...
Astro 10 Practice Test 3
... 20. When a star finishes `core hydrogen burning’, and transitions to `burning’ hydrogen in a shell around its core, what would we observe if we could look at the star from the outside? a. The intense energy from the `shell hydrogen burning’ would cause it to contract and cool off, moving down and t ...
... 20. When a star finishes `core hydrogen burning’, and transitions to `burning’ hydrogen in a shell around its core, what would we observe if we could look at the star from the outside? a. The intense energy from the `shell hydrogen burning’ would cause it to contract and cool off, moving down and t ...
Stars and Galaxies
... The mass of a tremendously big supernova core can collapse to a point, forming a black hole Gravity is so strong not even light can escape Beyond a black hole’s event horizon gravity operates as it would before the mass collapsed Matter emitted by a star over its life time is recycled and can ...
... The mass of a tremendously big supernova core can collapse to a point, forming a black hole Gravity is so strong not even light can escape Beyond a black hole’s event horizon gravity operates as it would before the mass collapsed Matter emitted by a star over its life time is recycled and can ...
The universe
... Planets around the sun and the surrounding planets revolve around the center of the galaxy (Milky Way). ...
... Planets around the sun and the surrounding planets revolve around the center of the galaxy (Milky Way). ...
Theoretical Modeling of Massive Stars Mr. Russell University of Delaware
... massive star(s) in our Milky Way Galaxy 10 M_sun Bipolar Nebula enshrouds star(s) from 1840’s “Giant Eruption” Very close so lots of data Data predicts system is actually a binary system with one star ~90 M_sun and the other ~30 M_sun Think it is in last stages of life before big star undergoes a su ...
... massive star(s) in our Milky Way Galaxy 10 M_sun Bipolar Nebula enshrouds star(s) from 1840’s “Giant Eruption” Very close so lots of data Data predicts system is actually a binary system with one star ~90 M_sun and the other ~30 M_sun Think it is in last stages of life before big star undergoes a su ...
PHYS 2410 General Astronomy Homework 8
... 14. The material that accretes onto a neutron star or black hole is expected to emit x-rays because ...
... 14. The material that accretes onto a neutron star or black hole is expected to emit x-rays because ...
PPT - Mr.E Science
... Nebula – a huge gas cloud made up mainly of Hydrogen that collapse down on itself and compresses the gas down into a Protostar Star is “born” when the protostar has contracting tight enough for Hydrogen to fuse into Helium, this releases the light and energy we normally associate with a “normal” sta ...
... Nebula – a huge gas cloud made up mainly of Hydrogen that collapse down on itself and compresses the gas down into a Protostar Star is “born” when the protostar has contracting tight enough for Hydrogen to fuse into Helium, this releases the light and energy we normally associate with a “normal” sta ...
14_creationism
... and “achievement”. Perhaps life is so complex that the origin of life is a lot less likely than we think. This is testable. As we search the universe we may be unlikely to find even primitive life. The origin of intelligence. Perhaps primitive life may be common in the universe but intelligent life ...
... and “achievement”. Perhaps life is so complex that the origin of life is a lot less likely than we think. This is testable. As we search the universe we may be unlikely to find even primitive life. The origin of intelligence. Perhaps primitive life may be common in the universe but intelligent life ...
Irregular Galaxies
... • Huge clouds of dust, gas, and the new elements explode into space. • This forms a new nebula. • Once a star supernovas, the core that remains of it will become either a neutron star or a black hole. ...
... • Huge clouds of dust, gas, and the new elements explode into space. • This forms a new nebula. • Once a star supernovas, the core that remains of it will become either a neutron star or a black hole. ...
Study Guide 4 Part A Outline
... o The Hubble Law implies Universe is expanding 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 ...
... o The Hubble Law implies Universe is expanding 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 ...
Gamma Ray Bursts
... • he found an optical flash on 1928.11.17 in the place of GRB 1978.11.19 1984 – another search • GRB 1979.11.05 = optical flash in 1901 • GRB 1979.01.13 = optical flash in 1944 average frequency of flashes of an object = 1.1/year it must live >50 years >50 explosions explosions not fatal e ...
... • he found an optical flash on 1928.11.17 in the place of GRB 1978.11.19 1984 – another search • GRB 1979.11.05 = optical flash in 1901 • GRB 1979.01.13 = optical flash in 1944 average frequency of flashes of an object = 1.1/year it must live >50 years >50 explosions explosions not fatal e ...
Galaxies - University of Iowa Astrophysics
... • Spiral nebulae were identified not long after development of the telescope around 1600 • In the 1600’s, it was suggested that spiral nebula are separate galaxies so far away that the stars blur together, but most people thought they were clouds of gas • The question wasn’t resolved until 1923. ...
... • Spiral nebulae were identified not long after development of the telescope around 1600 • In the 1600’s, it was suggested that spiral nebula are separate galaxies so far away that the stars blur together, but most people thought they were clouds of gas • The question wasn’t resolved until 1923. ...
Document
... • How do we know the distance to stars and clusters in our galaxy? • Stellar parallax: – Parallax of nearby stars relative to background stars. – Good out to ~500 pc. ...
... • How do we know the distance to stars and clusters in our galaxy? • Stellar parallax: – Parallax of nearby stars relative to background stars. – Good out to ~500 pc. ...
Astronomy Universe2
... Deep Space Phenomena Based on the observed rates of expansion it is believed that about 15-20 billion years ago all matter was concentrated into one “primeval atom”. This “atom” exploded and sent all matter and ...
... Deep Space Phenomena Based on the observed rates of expansion it is believed that about 15-20 billion years ago all matter was concentrated into one “primeval atom”. This “atom” exploded and sent all matter and ...
ANTARES - National Optical Astronomy Observatory
... This use case demonstrates another element of the antares architecture, namely multiwavelength association. It is likely that all galaxies contain a massive black hole at their center, but they are only detectable by their effect on the environment around them. If there is material actively falling ...
... This use case demonstrates another element of the antares architecture, namely multiwavelength association. It is likely that all galaxies contain a massive black hole at their center, but they are only detectable by their effect on the environment around them. If there is material actively falling ...
Heyvaerts
... SWIFT MISSION (launched November 2004) detects soft X ray counterpart of GRB 050506 (40 millisec duration) Since then, a handful of others ...
... SWIFT MISSION (launched November 2004) detects soft X ray counterpart of GRB 050506 (40 millisec duration) Since then, a handful of others ...
What Can We See in the Night Sky?
... • Groups of stars that are close together and travel together are known as star clusters • Star clusters are part of galaxies • Open clusters – contain about 50 to 1000 stars – dispersed along the Milky Way’s main band ...
... • Groups of stars that are close together and travel together are known as star clusters • Star clusters are part of galaxies • Open clusters – contain about 50 to 1000 stars – dispersed along the Milky Way’s main band ...
Where is the Solar System in the Universe?
... Scientists find it hard to work with the measurements we use on earth, like kilometers and miles, because the distances are so great it is hard for us to comprehend such enormous numbers. ...
... Scientists find it hard to work with the measurements we use on earth, like kilometers and miles, because the distances are so great it is hard for us to comprehend such enormous numbers. ...
Name Date ______ Period _____ Earth Science Chapter 25 Study
... What is the name for the interstellar matter that will eventually form a star? __________________________________________________________________ When is a star said to be born? __________________________________________________________________ What forces are most responsible for the formation of a ...
... What is the name for the interstellar matter that will eventually form a star? __________________________________________________________________ When is a star said to be born? __________________________________________________________________ What forces are most responsible for the formation of a ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.