Transits of planets: mean densities
... The main reason for the di↵erent mean densities are the di↵erent compositions, but also the di↵erent structure. As a very rough statement one can say, that high density objects ⇢¯ > 3.0 g cm 3 are composed of rocks and iron, intermediate density objects ⇢¯ ⇡ 2.0 g cm 3 contain in addition a substant ...
... The main reason for the di↵erent mean densities are the di↵erent compositions, but also the di↵erent structure. As a very rough statement one can say, that high density objects ⇢¯ > 3.0 g cm 3 are composed of rocks and iron, intermediate density objects ⇢¯ ⇡ 2.0 g cm 3 contain in addition a substant ...
Word
... That most of the Universe should be made of Hydrogen is reasonable since it is the simplest element, consisting of a single proton and electron. As we'll see in the third part of the course, we can also understand the very small contamination from "everything else" as due to the fusion reactions in ...
... That most of the Universe should be made of Hydrogen is reasonable since it is the simplest element, consisting of a single proton and electron. As we'll see in the third part of the course, we can also understand the very small contamination from "everything else" as due to the fusion reactions in ...
Cosmic Rays 3 - zainab
... Though very few particles may survive to the ground, the Cherenkov light will reach the ground. Thus, air Cherenkov telescopes can detect lower energy cosmic rays than extensive air shower arrays. However, since they are optical instruments they can only operate on clear moonless nights and they can ...
... Though very few particles may survive to the ground, the Cherenkov light will reach the ground. Thus, air Cherenkov telescopes can detect lower energy cosmic rays than extensive air shower arrays. However, since they are optical instruments they can only operate on clear moonless nights and they can ...
Peer-reviewed Article PDF - e
... along with R presents also the revolution periods and the velocities of rotation of the objects in the Solar System but these data are not consistent. It should also be noted that the data on the parameters of planetary orbits are given without errors, which is likely to be connected with not very h ...
... along with R presents also the revolution periods and the velocities of rotation of the objects in the Solar System but these data are not consistent. It should also be noted that the data on the parameters of planetary orbits are given without errors, which is likely to be connected with not very h ...
Lecture2 - UCSB Physics
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
PDF format
... a) rotation of Earth; motion of the Sun around the center of the Milky Way; motion of Earth around the Sun b) motion of the Sun around the center of the Milky Way; motion of Earth around the Sun; rotation of Earth c) motion of Earth around the Sun; rotation of Earth; motion of the Sun around the ...
... a) rotation of Earth; motion of the Sun around the center of the Milky Way; motion of Earth around the Sun b) motion of the Sun around the center of the Milky Way; motion of Earth around the Sun; rotation of Earth c) motion of Earth around the Sun; rotation of Earth; motion of the Sun around the ...
What kind of stuff
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
... Milky Way) • Thus, the size of M31 is 70 kpc, larger than our own Milky Way. • The same is true for billions of galaxies that populate the universe! Our Milky Way is just and “average Joe” galaxy • Overnight people realized that the universe was thousands of times bigger than they thought ...
Brown spots mark impact sites of Comet Shoemaker–Levy on
... massive outer planets of the Solar System (Jupiter, Saturn, Uranus, and Neptune), or passing stars. Rare hyperbolic comets pass once through the inner Solar System before being thrown out into interstellar space along hyperbolic trajectories. Comets are distinguished from asteroids by the presence o ...
... massive outer planets of the Solar System (Jupiter, Saturn, Uranus, and Neptune), or passing stars. Rare hyperbolic comets pass once through the inner Solar System before being thrown out into interstellar space along hyperbolic trajectories. Comets are distinguished from asteroids by the presence o ...
Starry Dome: Astronomy in Art and the Imagination
... independent body that was captured by the Earth’s gravitational pull. The prevalent theory suggests that the Moon was formed from a giant collision during the Earth’s formation. A planetary body, roughly the size of Mars, is thought to have collided with Earth, dislodging enough material to form the ...
... independent body that was captured by the Earth’s gravitational pull. The prevalent theory suggests that the Moon was formed from a giant collision during the Earth’s formation. A planetary body, roughly the size of Mars, is thought to have collided with Earth, dislodging enough material to form the ...
the K-12 Teacher Resource Packet for
... independent body that was captured by the Earth’s gravitational pull. The prevalent theory suggests that the Moon was formed from a giant collision during the Earth’s formation. A planetary body, roughly the size of Mars, is thought to have collided with Earth, dislodging enough material to form the ...
... independent body that was captured by the Earth’s gravitational pull. The prevalent theory suggests that the Moon was formed from a giant collision during the Earth’s formation. A planetary body, roughly the size of Mars, is thought to have collided with Earth, dislodging enough material to form the ...
Solutions to Homework #6, AST 203, Spring 2012
... Further calculations correctly done based on this erroneous value should be given full credit. However, if the resulting answer is completely ludicrous (e.g., 10−30 seconds for the time to travel to the nearest star, 50 stars in the visible universe), and no mention is made that the value seems wron ...
... Further calculations correctly done based on this erroneous value should be given full credit. However, if the resulting answer is completely ludicrous (e.g., 10−30 seconds for the time to travel to the nearest star, 50 stars in the visible universe), and no mention is made that the value seems wron ...
PH109 Exploring the Universe, Test#4, Spring 2005 Please indicate
... b) is best detected from the x-rays it produces in the intergalactic medium. c) will have no effect on the fate of the universe. d) comprises over 90% of the entire mass of the universe. 30. Which of these astronomers first related speeds and distances for galaxies? a) Harlow Shapley , b) Edwin Hubb ...
... b) is best detected from the x-rays it produces in the intergalactic medium. c) will have no effect on the fate of the universe. d) comprises over 90% of the entire mass of the universe. 30. Which of these astronomers first related speeds and distances for galaxies? a) Harlow Shapley , b) Edwin Hubb ...
physics/0610030 PDF
... relativistic velocity will, for now, remain that of propulsion, and it is far too early to suggest anything worthwhile for engineering design. Antimatter propulsion could one day provide the answer. However, it is beyond what we can create with existing technology and a thruster system utilizing it ...
... relativistic velocity will, for now, remain that of propulsion, and it is far too early to suggest anything worthwhile for engineering design. Antimatter propulsion could one day provide the answer. However, it is beyond what we can create with existing technology and a thruster system utilizing it ...
Static, Infinite, Etern and Auto sustentable Universe
... expansion just that this doesn‟t have a beginning; but as the matter expands, there is loss of density by its expansion (with a velocity according with the Hubble‟s law). To compensate this loss, Thomas Gold proposed a C field that creates matter with a continuous rate of one atom of hydrogen by cub ...
... expansion just that this doesn‟t have a beginning; but as the matter expands, there is loss of density by its expansion (with a velocity according with the Hubble‟s law). To compensate this loss, Thomas Gold proposed a C field that creates matter with a continuous rate of one atom of hydrogen by cub ...
Astronomy
... (C) relate the position of the Moon and Sun to their effect on ocean tides. (8) Earth and space. The student knows characteristics of the universe. The student is expected to: (A) describe components of the universe, including stars, nebulae, and galaxies, and use models such as the Herztsprung-Russ ...
... (C) relate the position of the Moon and Sun to their effect on ocean tides. (8) Earth and space. The student knows characteristics of the universe. The student is expected to: (A) describe components of the universe, including stars, nebulae, and galaxies, and use models such as the Herztsprung-Russ ...
WFIRST-2.4: What Every Astronomer Should Know
... Euclid weak lensing survey uses a wide optical filter and reaches an AB-magnitude depth similar to what LSST achieves in each of its g, r, and i filters. The cumulative imaging depth in the WFIRST-2.4 supernova survey fields, which will be observed many times over a 2-year interval, reaches 0.5 – 2. ...
... Euclid weak lensing survey uses a wide optical filter and reaches an AB-magnitude depth similar to what LSST achieves in each of its g, r, and i filters. The cumulative imaging depth in the WFIRST-2.4 supernova survey fields, which will be observed many times over a 2-year interval, reaches 0.5 – 2. ...
April 2015 - Southern Astronomical Society
... A new addition to the library is Jane Hawking’s ‘Travelling to Infinity’ which is the basis for the popular and academy award winning movie – ‘The Theory of Everything’. The movie is an interesting portrayal of Stephen Hawking’s story told though the eyes of his wife, Jane Hawking. The book gives a ...
... A new addition to the library is Jane Hawking’s ‘Travelling to Infinity’ which is the basis for the popular and academy award winning movie – ‘The Theory of Everything’. The movie is an interesting portrayal of Stephen Hawking’s story told though the eyes of his wife, Jane Hawking. The book gives a ...
The following slide show is a compilation of slides from... have been produced by different members of the fusion and...
... Same as large bulb except – Current density is higher – Sound is louder---what does this mean? – Colors are similar to the large bulb but more intense ...
... Same as large bulb except – Current density is higher – Sound is louder---what does this mean? – Colors are similar to the large bulb but more intense ...
The observational characteristics of the
... h Mpc, represented as ‘bumps’ in the 2-point correlation functions at the same scale. The BAO signal was “frozen” at this scale, and thus can be used as a standard ruler to study the cosmological model. The BAO signal has been previously detected using galaxy samples, with only a weak signature in s ...
... h Mpc, represented as ‘bumps’ in the 2-point correlation functions at the same scale. The BAO signal was “frozen” at this scale, and thus can be used as a standard ruler to study the cosmological model. The BAO signal has been previously detected using galaxy samples, with only a weak signature in s ...
Astroparticle physics A.M. van den Berg () O. Scholten
... If (t=0) > 1 the Universe would have recollapsed at once If (t=0) < 1 the Universe would have cooled very quickly HORIZON PROBLEM Regions on the CMB sky separated by more than 1o had no time to interact, yet their temperature is the same to 100 ppm What is needed An initial condition of the Univer ...
... If (t=0) > 1 the Universe would have recollapsed at once If (t=0) < 1 the Universe would have cooled very quickly HORIZON PROBLEM Regions on the CMB sky separated by more than 1o had no time to interact, yet their temperature is the same to 100 ppm What is needed An initial condition of the Univer ...
The First Stars in the Universe - Scientific American
... system to separate from the dark matter. The cooling hydrogen settles into a flattened rotating configuration that is clumpy and filamentary and possibly shaped like a disk. But because the darkmatter particles would not emit radiation or lose energy, they would remain scattered in the primordial cl ...
... system to separate from the dark matter. The cooling hydrogen settles into a flattened rotating configuration that is clumpy and filamentary and possibly shaped like a disk. But because the darkmatter particles would not emit radiation or lose energy, they would remain scattered in the primordial cl ...
20 – N10/4/PHYSI/SP3/ENG/TZ0/XX Option E
... (iii) State why the method of parallax can only be used for stars at a distance of less than a few hundred parsecs from Earth. ...
... (iii) State why the method of parallax can only be used for stars at a distance of less than a few hundred parsecs from Earth. ...
perspectives on state, space and scalar geographies
... have a geographical readership – whose work engages with the question of state spatiality but who (thus far) have not been incorporated into the intellectual lineages constructed for, or future agendas set by, state theory. The work of Manuel Castells (1996; 2000), for instance, is central to schola ...
... have a geographical readership – whose work engages with the question of state spatiality but who (thus far) have not been incorporated into the intellectual lineages constructed for, or future agendas set by, state theory. The work of Manuel Castells (1996; 2000), for instance, is central to schola ...
Lecture 29: Ellipticals and Irregulars
... The appearance of a stellar spectrum is determined mostly by the star’s temperature. Hot stars live short lives, therefore must be young. Spectra with O and B star features indicate a young stellar population In addition, lines from nebulae, particularly ionized H regions, can be present as well ...
... The appearance of a stellar spectrum is determined mostly by the star’s temperature. Hot stars live short lives, therefore must be young. Spectra with O and B star features indicate a young stellar population In addition, lines from nebulae, particularly ionized H regions, can be present as well ...
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.