young science communicator`s competition
... SHAPLEY: Yes, and if Curtis' “island universes” [said with a sneer] are all galaxies like the Milky Way, they'd have to be millions of light years away, an unimaginable distance! CURTIS: Perhaps we should not limit our imaginations... SHAPLEY: Well... [pauses, searching for an argument] What about t ...
... SHAPLEY: Yes, and if Curtis' “island universes” [said with a sneer] are all galaxies like the Milky Way, they'd have to be millions of light years away, an unimaginable distance! CURTIS: Perhaps we should not limit our imaginations... SHAPLEY: Well... [pauses, searching for an argument] What about t ...
Nebulae
... The Sun is just a star, an average star. It just looks so big and bright, because it is so close, compared with other stars. ...
... The Sun is just a star, an average star. It just looks so big and bright, because it is so close, compared with other stars. ...
Planets and Moons - Fraser Heights Chess Club
... and billions of stars held together by gravity. One galaxy can have hundreds of billions of stars and be as large as 200,000 light years across. • Galaxy is derived from the Greek galaxias meaning "milky", a reference to the Milky Way. • Many galaxies are believed to have black holes at their active ...
... and billions of stars held together by gravity. One galaxy can have hundreds of billions of stars and be as large as 200,000 light years across. • Galaxy is derived from the Greek galaxias meaning "milky", a reference to the Milky Way. • Many galaxies are believed to have black holes at their active ...
question - UW Canvas
... elements without any of these stages resulting in degeneracy or any flashes like the helium flash that occurs in solar-type stars? a. The cores of massive stars are so hot, have such high densities and pressures, that these stars fuse all elements simultaneously; that is, all at the same time. b.The ...
... elements without any of these stages resulting in degeneracy or any flashes like the helium flash that occurs in solar-type stars? a. The cores of massive stars are so hot, have such high densities and pressures, that these stars fuse all elements simultaneously; that is, all at the same time. b.The ...
Chapter 30 Notes
... As the planetary nebula disperses; gravity causes the remaining matter in the star to collapse inward until it cannot be pressed further together. A hot, extremely dense core of matter is left behind. This mass is called a white dwarf and can shine for billions of years before it cools completely. S ...
... As the planetary nebula disperses; gravity causes the remaining matter in the star to collapse inward until it cannot be pressed further together. A hot, extremely dense core of matter is left behind. This mass is called a white dwarf and can shine for billions of years before it cools completely. S ...
Final Review Sheet
... in the future. Its radius is gradually increasing, but it is getting denser in its center. V. Post Main Sequence Evolution of Stars Lighter than 8 Msun Hydrogen fuel exhausted in inner 10 - 15% of mass. Helium core contracts and grows hotter. Hydrogen continues to burn in an overlying shell that is ...
... in the future. Its radius is gradually increasing, but it is getting denser in its center. V. Post Main Sequence Evolution of Stars Lighter than 8 Msun Hydrogen fuel exhausted in inner 10 - 15% of mass. Helium core contracts and grows hotter. Hydrogen continues to burn in an overlying shell that is ...
Chapter 17
... The center of Since we are located in the outer part of the galaxy, dust between the the galaxy stars blocks out much of the visible light coming from objects in the disk. Because of this, astronomers use infrared and radio telescopes to study our galaxy. They have learned that the center of the gal ...
... The center of Since we are located in the outer part of the galaxy, dust between the the galaxy stars blocks out much of the visible light coming from objects in the disk. Because of this, astronomers use infrared and radio telescopes to study our galaxy. They have learned that the center of the gal ...
2-GW_MEPhI_2016_bisnovatyi
... and the ringdown of the resulting single black hole. The signal was observed with a matchedfilter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1σ. The source lies at a luminosity distance of 410 (+ ...
... and the ringdown of the resulting single black hole. The signal was observed with a matchedfilter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1σ. The source lies at a luminosity distance of 410 (+ ...
Universe 8e Lecture Chapter 24 Galaxies
... Galactic Collisions and Mergers: When two galaxies collide, their stars pass each other, but their interstellar media collide violently, either stripping the gas and dust from the galaxies or triggering prolific star formation. The gravitational effects during a galactic collision can throw stars ou ...
... Galactic Collisions and Mergers: When two galaxies collide, their stars pass each other, but their interstellar media collide violently, either stripping the gas and dust from the galaxies or triggering prolific star formation. The gravitational effects during a galactic collision can throw stars ou ...
TAP 704- 8: The ladder of astronomical distances
... for these models. The Universe according to de Vaucouleurs came out dangerously close to being younger than some of the oldest objects, such as globular star clusters, to be found in it. This was by no means the first time that changes to astronomical distance scales had been suggested. Successive r ...
... for these models. The Universe according to de Vaucouleurs came out dangerously close to being younger than some of the oldest objects, such as globular star clusters, to be found in it. This was by no means the first time that changes to astronomical distance scales had been suggested. Successive r ...
Study of the Point Spread Function of AGILE
... aperture photometry is iteratively applied to several concentric circular annuli centered at the Crab position, whose inner and outer radii increment by 0.25° up to a maximum aperture chosen according to the energy interval under consideration (This method is also known as surface photometry [10]). ...
... aperture photometry is iteratively applied to several concentric circular annuli centered at the Crab position, whose inner and outer radii increment by 0.25° up to a maximum aperture chosen according to the energy interval under consideration (This method is also known as surface photometry [10]). ...
The Milky Way By
... Appearance from Earth • All the stars that the eye can distinguish in the night sky are part of the Milky Way Galaxy, but aside from these relatively nearby stars, the galaxy appears as a hazy band of white light arching around the entire celestial sphere. ...
... Appearance from Earth • All the stars that the eye can distinguish in the night sky are part of the Milky Way Galaxy, but aside from these relatively nearby stars, the galaxy appears as a hazy band of white light arching around the entire celestial sphere. ...
absolute brightness: The apparent brightness a star would have if it
... is highest is an indication of the temperature of the radiating object. Also referred to as the Planck curve. black holes: A dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light. Black holes are thought to result from ...
... is highest is an indication of the temperature of the radiating object. Also referred to as the Planck curve. black holes: A dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light. Black holes are thought to result from ...
absolute brightness: The apparent brightness a star would have if it
... is highest is an indication of the temperature of the radiating object. Also referred to as the Planck curve. black holes: A dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light. Black holes are thought to result from ...
... is highest is an indication of the temperature of the radiating object. Also referred to as the Planck curve. black holes: A dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light. Black holes are thought to result from ...
Ch 28 Class Notes
... Radio telescopes are often used in arrays (arrangements of multiple telescopes so they can act like one large telescope). In addition to radio waves, astronomers also gather data from ultraviolet light, X rays, gamma rays, and infrared wavelengths when studying celestial objects. Much of these wavel ...
... Radio telescopes are often used in arrays (arrangements of multiple telescopes so they can act like one large telescope). In addition to radio waves, astronomers also gather data from ultraviolet light, X rays, gamma rays, and infrared wavelengths when studying celestial objects. Much of these wavel ...
Birth, Age and the Future of the Universe
... divide this distance by the recession velocity. The result is nothing else but the expansion age of the ...
... divide this distance by the recession velocity. The result is nothing else but the expansion age of the ...
Quasars- The Brightest Black Holes
... bulk flows of material within a gas cloud (such as rotation, or in/outflow), augmenting the width of the line still further. All Seyfert galaxies show a set of comparatively narrow lines where the width indicates a motion of around 400 km/s; these tend to be ‘forbidden’ lines, only emitted from regi ...
... bulk flows of material within a gas cloud (such as rotation, or in/outflow), augmenting the width of the line still further. All Seyfert galaxies show a set of comparatively narrow lines where the width indicates a motion of around 400 km/s; these tend to be ‘forbidden’ lines, only emitted from regi ...
Hubble Space Telescope Image
... researchers. They believe it may be an extremely remote object made visible by the cluster's magnifying powers. This is the second time Hubble observed this cluster. ...
... researchers. They believe it may be an extremely remote object made visible by the cluster's magnifying powers. This is the second time Hubble observed this cluster. ...
Barium Stars Observed with the Coude Echelle Spectrometer
... The Optical Pulsar H 2252-035 (AO Psc) M. KUbiak, Warsaw University Observatory, Poland, and Hoher List Observatorium, FRG The optical counterpart of the pulsating X-ray source H 2252035 appeared to be an interesting object for optical astronomers also. In the X-ray domain it shows the same characte ...
... The Optical Pulsar H 2252-035 (AO Psc) M. KUbiak, Warsaw University Observatory, Poland, and Hoher List Observatorium, FRG The optical counterpart of the pulsating X-ray source H 2252035 appeared to be an interesting object for optical astronomers also. In the X-ray domain it shows the same characte ...
Galaxies, Cosmology and the Accelera`ng Universe
... • Current thinking is that the thick disk stars were originally in the thin disk but were sca?ered • (some recent observa6ons suggest that there is not such a big difference between the thick and ...
... • Current thinking is that the thick disk stars were originally in the thin disk but were sca?ered • (some recent observa6ons suggest that there is not such a big difference between the thick and ...
Some Examples of Virtual Observatory Enabled Science What Are the Some Distinguishing
... bands to simultaneously solve for stellar type and reddening, and thus absolute magnitude and distance ! 3-D distribution of stars • Combine with FIR and molecular gas maps to derive the 3-D distribution of dust and cold gas • Kinematics of disk gas from H I 21-cm line and molecular lines • Stellar ...
... bands to simultaneously solve for stellar type and reddening, and thus absolute magnitude and distance ! 3-D distribution of stars • Combine with FIR and molecular gas maps to derive the 3-D distribution of dust and cold gas • Kinematics of disk gas from H I 21-cm line and molecular lines • Stellar ...
Galaxies - WordPress.com
... ones with large, bright nuclei of stars and tightly wound spiral arms, to ones with very small, dim nuclei and open sprawling arms. The Andromeda Galaxy is also a spiral galaxy. ...
... ones with large, bright nuclei of stars and tightly wound spiral arms, to ones with very small, dim nuclei and open sprawling arms. The Andromeda Galaxy is also a spiral galaxy. ...
File
... *It generates no nuclear energy. *It is almost completely degenerate matter. *Except for a thin layer at its surface, it contains no gas. ...
... *It generates no nuclear energy. *It is almost completely degenerate matter. *Except for a thin layer at its surface, it contains no gas. ...
Nobel Prize in Physics 2002: Riccardo Giaconni
... Earth, as the atmosphere acts like an absorbing layer. It may sound strange since X-rays easily pass through our body (except the bones). Although the atmosphere is very tenuous compared to our body, the total thickness offered by it is much larger and X-rays suffer considerable absorption in it. Th ...
... Earth, as the atmosphere acts like an absorbing layer. It may sound strange since X-rays easily pass through our body (except the bones). Although the atmosphere is very tenuous compared to our body, the total thickness offered by it is much larger and X-rays suffer considerable absorption in it. Th ...
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.