Chapter 15 The Formation of Planetary Systems
... 6. Most moons’ orbits are also in the same sense 7. Solar system is highly differentiated 8. Asteroids are very old, and not like either inner or outer planets ...
... 6. Most moons’ orbits are also in the same sense 7. Solar system is highly differentiated 8. Asteroids are very old, and not like either inner or outer planets ...
ppt
... Maruyama et al.): B affects the neutrino absorption cross sections, so that the neutrino luminosity, hence the ee, might be 20-30% higher at one neutron star throat than at the other. This WILL give an overall ee. ...
... Maruyama et al.): B affects the neutrino absorption cross sections, so that the neutrino luminosity, hence the ee, might be 20-30% higher at one neutron star throat than at the other. This WILL give an overall ee. ...
PPT - ALFALFA survey
... Schneider (2000). It was a drift-scan survey taken in a series of declination strips with the Arecibo 305-m telescope. The velocity limit of the ADBS is 8000 km/s (it is volume limited!). The full ADBS sample includes 265 galaxies over ~420 sq. deg. • Since it is a “blind” HI survey, it does not suf ...
... Schneider (2000). It was a drift-scan survey taken in a series of declination strips with the Arecibo 305-m telescope. The velocity limit of the ADBS is 8000 km/s (it is volume limited!). The full ADBS sample includes 265 galaxies over ~420 sq. deg. • Since it is a “blind” HI survey, it does not suf ...
Space, Commerce, and National Security
... services. On the other side are those who contend that weapons should never be employed in space. They urge instead that arms control and other cooperative measures are the best means to protect American equities in space, as well as to prevent space from becoming an arena for armed conflict. This d ...
... services. On the other side are those who contend that weapons should never be employed in space. They urge instead that arms control and other cooperative measures are the best means to protect American equities in space, as well as to prevent space from becoming an arena for armed conflict. This d ...
Astronomy 101-lecture 8 Astrochemistry
... Astrochemistry studies molecules anywhere in the universe: –how ...
... Astrochemistry studies molecules anywhere in the universe: –how ...
The Physical Nature of Cosmic Accretion of Baryons and Dark Matter
... Finally, although the model presented here is exAndrewtremely Wetzel simple to evaluate, we also provide a very rough ...
... Finally, although the model presented here is exAndrewtremely Wetzel simple to evaluate, we also provide a very rough ...
10. Atmospheres of Planets and of Exoplanets - ETH E
... short time by photoevaporation, i.e. by ionization and acceleration of the particles with escape velocity into the free space. Since Mercury can, however, maintain his residual Atmosphere over long periods of time, there must exist a constant replenishment of particles (s. p. 422). It must, however, ...
... short time by photoevaporation, i.e. by ionization and acceleration of the particles with escape velocity into the free space. Since Mercury can, however, maintain his residual Atmosphere over long periods of time, there must exist a constant replenishment of particles (s. p. 422). It must, however, ...
Invited Talks at Major Meetings Andreas Albrecht Updated 8/31
... 31. Cosmology with a time varying speed of light Cosmo-98, Asilomar 1998 32. Cosmology with a time varying speed of light 19th Texas meeting on relativistic Astrophysics Paris, December 1998 33. Varying speed of light as a solution to cosmological problems Pritzker Symposium Workshop Chicago, Januar ...
... 31. Cosmology with a time varying speed of light Cosmo-98, Asilomar 1998 32. Cosmology with a time varying speed of light 19th Texas meeting on relativistic Astrophysics Paris, December 1998 33. Varying speed of light as a solution to cosmological problems Pritzker Symposium Workshop Chicago, Januar ...
presentation (PPT format)
... times the mass of MW…we also know that only 10% of the typical galaxy mass is in radiation…the rest is in …dark matter… • Most galaxies are in Groups and in Clusters • Remote clusters of galaxies are receding from us…what is called the Hubble Law • (this law reveals that the Universe is expanding) ...
... times the mass of MW…we also know that only 10% of the typical galaxy mass is in radiation…the rest is in …dark matter… • Most galaxies are in Groups and in Clusters • Remote clusters of galaxies are receding from us…what is called the Hubble Law • (this law reveals that the Universe is expanding) ...
MS-SCI-PS-Unit 4 -- Chapter 15- Stars, Galaxies
... atmosphere. To detect these wavelengths, astronomers have placed telescopes in space. Some space telescopes are designed to detect visible light or infrared radiation, since Earth's atmosphere also interferes with the transmission of these forms of radiation. The Hubble Space Telescope is a reflecti ...
... atmosphere. To detect these wavelengths, astronomers have placed telescopes in space. Some space telescopes are designed to detect visible light or infrared radiation, since Earth's atmosphere also interferes with the transmission of these forms of radiation. The Hubble Space Telescope is a reflecti ...
NASA/TM—2005–213688 National Aeronautics and Space Administration AD33
... Center (MSFC) to assess a list of “Revolutionary Physical Sciences Radiation Protection Strategies,” (app. A) that had been assembled by Headquarters’ Advanced Radiation Protection Working Group, and other concepts found in the literature. For planetary missions, the necessity of adequately shieldin ...
... Center (MSFC) to assess a list of “Revolutionary Physical Sciences Radiation Protection Strategies,” (app. A) that had been assembled by Headquarters’ Advanced Radiation Protection Working Group, and other concepts found in the literature. For planetary missions, the necessity of adequately shieldin ...
Draft paper (Published in ApJL)
... the z-component of the gas velocity along the cylinder delineated by the vertical lines in the left-hand panel. The cylinder, whose radius is chosen to be the same as the virial radius of the galaxy, is aligned with the z axis and therefore roughly perpendicular to the pancake. The gas density in th ...
... the z-component of the gas velocity along the cylinder delineated by the vertical lines in the left-hand panel. The cylinder, whose radius is chosen to be the same as the virial radius of the galaxy, is aligned with the z axis and therefore roughly perpendicular to the pancake. The gas density in th ...
Comparison of Precession Theories: An
... was Sir Isaac Newton, who had just developed his theories of gravity that said if the Earth did wobble it must be due to the mass of the Sun and the Moon, the only bodies considered close enough or large enough to have such an effect. But Newton’s equations never did match observed precession rates. ...
... was Sir Isaac Newton, who had just developed his theories of gravity that said if the Earth did wobble it must be due to the mass of the Sun and the Moon, the only bodies considered close enough or large enough to have such an effect. But Newton’s equations never did match observed precession rates. ...
chapter5 - Homework Market
... makes the coils in your toaster glow when they are hot. • You probably have also noticed that your toaster’s coils glow different colors as they heat up. • If they are not too hot, the coils are deep red. • As they heat up, though, they grow brighter and ...
... makes the coils in your toaster glow when they are hot. • You probably have also noticed that your toaster’s coils glow different colors as they heat up. • If they are not too hot, the coils are deep red. • As they heat up, though, they grow brighter and ...
Quasars- The Brightest Black Holes
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
A Planetary Overview
... also found that the direction of the interplanetary magnetic field beyond the shock varies much slower (every 100 days or so) than expected (every 13 days or so, half of the Sun’s rotational period); this field is carried out by the solar wind, with the alternating directions forming a pattern of st ...
... also found that the direction of the interplanetary magnetic field beyond the shock varies much slower (every 100 days or so) than expected (every 13 days or so, half of the Sun’s rotational period); this field is carried out by the solar wind, with the alternating directions forming a pattern of st ...
HON 392 - Chapman University
... Like the familiar nesting "Russian dolls" arrangement, this earth is enveloped inside a series of crystalline revolving layers, the “heavens.” The Earth itself is at the center of the universe. It is a sphere (only a small minority have ever believed it to be actually flat). Above, quite visibly, ar ...
... Like the familiar nesting "Russian dolls" arrangement, this earth is enveloped inside a series of crystalline revolving layers, the “heavens.” The Earth itself is at the center of the universe. It is a sphere (only a small minority have ever believed it to be actually flat). Above, quite visibly, ar ...
The Quest for Gamma Rays: Exploring the Most Violent Places in the
... Prize in physics. The Compton effect and the inverse effect, the scattering of photons to higher energies by electrons, are both fundamental to the production of cosmic gamma rays and the methods which we use to detect them. How to Make Gamma Rays Gamma rays are primarily produced by radioactive dec ...
... Prize in physics. The Compton effect and the inverse effect, the scattering of photons to higher energies by electrons, are both fundamental to the production of cosmic gamma rays and the methods which we use to detect them. How to Make Gamma Rays Gamma rays are primarily produced by radioactive dec ...
PHY306 Introduction to Cosmology Practice Problems
... distance indicator measures luminosity distance (standard candle) or angular diameter distance (standard ruler)? (b) For the local universe (z ≪ 1), the Hubble law can be written cz = H0 d, where d is the distance. (i) Galaxies have typical peculiar velocities of order 1000 km s−1 . If we assume tha ...
... distance indicator measures luminosity distance (standard candle) or angular diameter distance (standard ruler)? (b) For the local universe (z ≪ 1), the Hubble law can be written cz = H0 d, where d is the distance. (i) Galaxies have typical peculiar velocities of order 1000 km s−1 . If we assume tha ...
NASA FUSE Satellite Solves the Case of the Missing Deuterium
... atoms within a hundred light years of the sun and values as low as 5 parts per million elsewhere. When a region is disturbed by a supernova or hot stars, dust grains are vaporized, releasing deuterium atoms back into a gas phase. FUSE detects high deuterium levels in such regions. Primordial deuteri ...
... atoms within a hundred light years of the sun and values as low as 5 parts per million elsewhere. When a region is disturbed by a supernova or hot stars, dust grains are vaporized, releasing deuterium atoms back into a gas phase. FUSE detects high deuterium levels in such regions. Primordial deuteri ...
Video Lesson Information Astronomy: Observations & Theories Astronomy 1
... important for the study of stars and their mass–luminosity relation. Lesson 9 - Stellar Births The study of stellar evolution is presented by examining the birth of stars. Different types of nebulae are introduced and the necessary ingredients to produce a star: dust, gas, gravity, and maybe a littl ...
... important for the study of stars and their mass–luminosity relation. Lesson 9 - Stellar Births The study of stellar evolution is presented by examining the birth of stars. Different types of nebulae are introduced and the necessary ingredients to produce a star: dust, gas, gravity, and maybe a littl ...
Evolutionary properties of galaxies and mass assembly up
... While the higher fraction of bright galaxies in over-dense regions seen locally is already present at z ~ 1.2, the environmental dependency of the LF shape at high redshift appears to be different from what is seen at low redshift. Is this difference due to an increase with cosmic time of the number ...
... While the higher fraction of bright galaxies in over-dense regions seen locally is already present at z ~ 1.2, the environmental dependency of the LF shape at high redshift appears to be different from what is seen at low redshift. Is this difference due to an increase with cosmic time of the number ...
Outer space
Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.