cosmology-2005
... Vera Rubin determined the velocities as a function of distance from the galactic center of clouds of ionized hydrogen (in astrophysical terminology, HII regions). This was done by measurement of the Doppler shift of their H-alpha emission lines. The hydrogen clouds move with the stars and other vis ...
... Vera Rubin determined the velocities as a function of distance from the galactic center of clouds of ionized hydrogen (in astrophysical terminology, HII regions). This was done by measurement of the Doppler shift of their H-alpha emission lines. The hydrogen clouds move with the stars and other vis ...
Stellar Remnants
... • an odd radio signal with a rapid pulse rate of one burst per 1.33 seconds • more pulsating radio sources were discovered and eventually were named pulsars • No clue what they were! ...
... • an odd radio signal with a rapid pulse rate of one burst per 1.33 seconds • more pulsating radio sources were discovered and eventually were named pulsars • No clue what they were! ...
M.C. Runacres S.P. Owocki It is well known that the winds of hot
... expansion of the gas. This gives equations that describe a spherically symmetric stellar wind but have almost the same form as the planar equations and can be used in a moving box. Finally, we impose periodic boundary conditions on the box. Details of this technique will be given in a subsequent pap ...
... expansion of the gas. This gives equations that describe a spherically symmetric stellar wind but have almost the same form as the planar equations and can be used in a moving box. Finally, we impose periodic boundary conditions on the box. Details of this technique will be given in a subsequent pap ...
THE METER STICK MODEL OF THE SOLAR SYSTEM
... Distances between planets are very large but they are insignificant compared with distances between stars. Because units that are commonly used to measure distances on Earth such as miles or kilometers are too small for use in astronomy, other units of distance are needed. Within the solar system, t ...
... Distances between planets are very large but they are insignificant compared with distances between stars. Because units that are commonly used to measure distances on Earth such as miles or kilometers are too small for use in astronomy, other units of distance are needed. Within the solar system, t ...
Course summary for Unit 4 "Interactions of Light and
... Light and matter share particle and wave characteristics - "Particle-Wave Duality". The wavelength is given by = h/p. But since h is so incredibly small a value, the momentum also has to be incredibly small for an observable wave effect. This is only achieved by the electron, whose momentum is ver ...
... Light and matter share particle and wave characteristics - "Particle-Wave Duality". The wavelength is given by = h/p. But since h is so incredibly small a value, the momentum also has to be incredibly small for an observable wave effect. This is only achieved by the electron, whose momentum is ver ...
The Origin of Light
... Planck time. Quantum theory is king when considering interactions at the atomic level, where energy is not continuous but comes in discrete bundles (quanta) and time in definite intervals. Hence the first Planck time. Energies on the grander scale are described by Newtonian physics, and maybe, one d ...
... Planck time. Quantum theory is king when considering interactions at the atomic level, where energy is not continuous but comes in discrete bundles (quanta) and time in definite intervals. Hence the first Planck time. Energies on the grander scale are described by Newtonian physics, and maybe, one d ...
Astronomy DR Packet
... 2. The Sun makes up ___________% of the mass of the solar system. 3. Look at Fig. 2.11: If the Sun were the size of a basketball, how big would the Earth be in comparison? ...
... 2. The Sun makes up ___________% of the mass of the solar system. 3. Look at Fig. 2.11: If the Sun were the size of a basketball, how big would the Earth be in comparison? ...
Hubble Redshift - at www.arxiv.org.
... a positive cosmological constant must be added to the equations of general relativity to fit the data. A negative deceleration parameter was also required, implying that the universe is accelerating in its expansion, a surprising result since it implies the existence of a repulsive force that overpo ...
... a positive cosmological constant must be added to the equations of general relativity to fit the data. A negative deceleration parameter was also required, implying that the universe is accelerating in its expansion, a surprising result since it implies the existence of a repulsive force that overpo ...
ppt - SLAC
... • It is easy to show that for synchrotron or inverse Compton radiation, such a spectral form arises from a power-law distribution of the number of radiating electrons, N(g) = Nog-p where a = (p-1)/2 • This means that for most typical spectra, the least-energetic particles are most numerous – they ar ...
... • It is easy to show that for synchrotron or inverse Compton radiation, such a spectral form arises from a power-law distribution of the number of radiating electrons, N(g) = Nog-p where a = (p-1)/2 • This means that for most typical spectra, the least-energetic particles are most numerous – they ar ...
A Massive Galaxy in its Core Formation Phase Three Billion Years
... Most massive galaxies are thought to have formed their dense stellar cores at early cosmic epochs.1–3 However, cores in their formation phase have not yet been observed. Previous studies have found galaxies with high gas velocity dispersions4 or small apparent sizes5–7 but so far no objects have bee ...
... Most massive galaxies are thought to have formed their dense stellar cores at early cosmic epochs.1–3 However, cores in their formation phase have not yet been observed. Previous studies have found galaxies with high gas velocity dispersions4 or small apparent sizes5–7 but so far no objects have bee ...
Cosmic Surveyor
... In 1907, Einstein was preparing a review of special relativity when he suddenly wondered how Newtonian gravitation would have to be modified to fit in with special relativity. At this point there occurred to Einstein, described by him as the happiest thought of my life , namely that an observer who ...
... In 1907, Einstein was preparing a review of special relativity when he suddenly wondered how Newtonian gravitation would have to be modified to fit in with special relativity. At this point there occurred to Einstein, described by him as the happiest thought of my life , namely that an observer who ...
of the Sun
... STELLIFEROUS ERA – the current era • Electrons combined with existing nuclei to form atoms, mostly hydrogen and helium • Atoms condensed into the first generation of stars during the first 200 million years • Galaxies formed • Sun, solar system formed 4.6 billion years ago • Life appeared on Earth ...
... STELLIFEROUS ERA – the current era • Electrons combined with existing nuclei to form atoms, mostly hydrogen and helium • Atoms condensed into the first generation of stars during the first 200 million years • Galaxies formed • Sun, solar system formed 4.6 billion years ago • Life appeared on Earth ...
Earth Science 25.2A : Stellar Evolution
... The Birth of a Star: The birthplaces of stars are dark, cool interstellar clouds. These nebulae are made up of dust and gases. ...
... The Birth of a Star: The birthplaces of stars are dark, cool interstellar clouds. These nebulae are made up of dust and gases. ...
Stars and Galaxies
... A spectroscope is a device that uses a prism or diffraction grating to disperse the light into its component wavelengths. When connected to a telescope, it disperses the light from the star or other celestial object collected by the telescope into its electromagnetic spectrum. This tells astronomers ...
... A spectroscope is a device that uses a prism or diffraction grating to disperse the light into its component wavelengths. When connected to a telescope, it disperses the light from the star or other celestial object collected by the telescope into its electromagnetic spectrum. This tells astronomers ...
Bruce`s Fermi Presentation - Fullerton College Staff Web Pages
... Fermi’s Paradox • Our Galaxy is old (12+ billion years) • Plus, it is moderate in size (100,000 l.y.) • Any advanced civilization could colonize the Galaxy in a few million years… Therefore, ETs should be here…so... ...
... Fermi’s Paradox • Our Galaxy is old (12+ billion years) • Plus, it is moderate in size (100,000 l.y.) • Any advanced civilization could colonize the Galaxy in a few million years… Therefore, ETs should be here…so... ...
High mass-to-light ratios of UCDs
... ❒ There are several ways to explain these high mass-to-light ratios. They could be caused by stellar mass-functions which are either top or bottom heavy (Dabringhausen et al. 2008, Mieske & Kroupa 2008). ❒ Goerdt et al. (2008) have investigated a scenario in which UCDs form through adiabatic gas inf ...
... ❒ There are several ways to explain these high mass-to-light ratios. They could be caused by stellar mass-functions which are either top or bottom heavy (Dabringhausen et al. 2008, Mieske & Kroupa 2008). ❒ Goerdt et al. (2008) have investigated a scenario in which UCDs form through adiabatic gas inf ...
dyk_ans
... prefrontal cortex and the hippocampus. On the other hand, a memory system that includes the parahippocampal gyrus (grey matter surrounding the hippocampus) and its cortical connections mediates feelings of familiarity. It has been argued that deja vu experiences occur when the parahippocampal gyrus ...
... prefrontal cortex and the hippocampus. On the other hand, a memory system that includes the parahippocampal gyrus (grey matter surrounding the hippocampus) and its cortical connections mediates feelings of familiarity. It has been argued that deja vu experiences occur when the parahippocampal gyrus ...
P1 Revision Sheets
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). Red-Shift Light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. This is k ...
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). Red-Shift Light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. This is k ...
P1 Revision Sheets
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). Red-Shift Light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. This is k ...
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). Red-Shift Light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. This is k ...
Friday, August 29
... The Trouble with Angles • Angular size of an object cannot tell us its actual size – depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth ...
... The Trouble with Angles • Angular size of an object cannot tell us its actual size – depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth ...
Star - University of Pittsburgh
... 3. Why a star's color depends on its surface temperature (and ultimately its age and mass). 4. Why a star's diameter, brightness, and color change as it ages. 5. Why a galaxy has a spiral structure. 6. Why the fate of our Universe depends on its mass. ...
... 3. Why a star's color depends on its surface temperature (and ultimately its age and mass). 4. Why a star's diameter, brightness, and color change as it ages. 5. Why a galaxy has a spiral structure. 6. Why the fate of our Universe depends on its mass. ...
Question paper - Unit 5 (6PH05) - January 2012
... 3 A bridge vibrates gently as cars are driven across it. This is an example of A forced oscillation. B free oscillation. C resonance. D stationary waves. (Total for Question 3 = 1 mark) 4 A Hertzsprung-Russell diagram is plotted for an old star cluster. Compared with a young cluster containing a si ...
... 3 A bridge vibrates gently as cars are driven across it. This is an example of A forced oscillation. B free oscillation. C resonance. D stationary waves. (Total for Question 3 = 1 mark) 4 A Hertzsprung-Russell diagram is plotted for an old star cluster. Compared with a young cluster containing a si ...
P1 Revision sheet. - Newmarket Academy
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). ...
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). ...
P1 Revision Sheet
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). Red-Shift Light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. This is k ...
... and the frequency ________________. For example a fire engine siren will sound different depending on whether it is moving towards you (pitch is higher) or away from you (pitch is lower). Red-Shift Light observed from distant galaxies has been ‘shifted’ towards the red end of the spectrum. This is k ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.