ASTR 330: The Solar System
... than 4.6 billion years, even though the Galaxy that contains the solar system is much older than this. Furthermore, many meteorites share this common age, which we have called “the age of the solar system”. • Around 100 years ago, a very different theory for the formation of the planets was in favor ...
... than 4.6 billion years, even though the Galaxy that contains the solar system is much older than this. Furthermore, many meteorites share this common age, which we have called “the age of the solar system”. • Around 100 years ago, a very different theory for the formation of the planets was in favor ...
Star Dust By the Rev. Tom Garrison
... There are some 59 elements in the human body that are also found on the earth’s crust. iv And scientists like Margaret Meixner say the “earth on which we stand is made almost entirely of ...
... There are some 59 elements in the human body that are also found on the earth’s crust. iv And scientists like Margaret Meixner say the “earth on which we stand is made almost entirely of ...
Lecture 30 Solar System Formation and Early Evolution
... The composition and density of solid materials at any radius from the sun will reflect the P-T path the material took as the solar nebula cooled. Those compositions should be broadly true in what’s left today, the planets, which accumulated from dust sized particles that form, collide, and accrete.. ...
... The composition and density of solid materials at any radius from the sun will reflect the P-T path the material took as the solar nebula cooled. Those compositions should be broadly true in what’s left today, the planets, which accumulated from dust sized particles that form, collide, and accrete.. ...
Editorial Introduction: Planetary geosciences, the Dutch contribution
... conditions. Measurements of the Si isotope composition of solar system materials has been used to trace the conditions of core formation in the Earth and the other terrestrial planets (and larger asteroids), but the authors show that a much larger experimental database will be required to be able to ...
... conditions. Measurements of the Si isotope composition of solar system materials has been used to trace the conditions of core formation in the Earth and the other terrestrial planets (and larger asteroids), but the authors show that a much larger experimental database will be required to be able to ...
Molecular cloud - University of Western Ontario
... - largest (supersonic) speeds in outermost parts of stratified cloud - significant power generated on largest scales even with driving on smaller scales, due to stratification effect - dissipation time is related to cloud size, not internal driving scale: provides a way out of “luminosity problem” i ...
... - largest (supersonic) speeds in outermost parts of stratified cloud - significant power generated on largest scales even with driving on smaller scales, due to stratification effect - dissipation time is related to cloud size, not internal driving scale: provides a way out of “luminosity problem” i ...
1 HABITABLE ZONES IN THE UNIVERSE GUILLERMO GONZALEZ
... Hart (1978, 1979) presented a detailed and mathematical study of the CHZ. He modeled the evolution of the Earth’s climate since its formation, including volcanic outgassing, atmospheric loss, the greenhouse effect, albedo variations, biomass variation, various geophysical processes, and the gradual ...
... Hart (1978, 1979) presented a detailed and mathematical study of the CHZ. He modeled the evolution of the Earth’s climate since its formation, including volcanic outgassing, atmospheric loss, the greenhouse effect, albedo variations, biomass variation, various geophysical processes, and the gradual ...
A Drastic Chemical Change Occurring in Birth of Planetary System
... picture seen in L1527 is applicable to other star-forming regions. Although many observational efforts aiming at understandings of planetary-system formation have been made, this study is novel in focusing on the chemical change. By extending this new method to various solar-type protostars, diversi ...
... picture seen in L1527 is applicable to other star-forming regions. Although many observational efforts aiming at understandings of planetary-system formation have been made, this study is novel in focusing on the chemical change. By extending this new method to various solar-type protostars, diversi ...
New Worlds on the Horizon: Earth-Sized Planets Close to Other Stars.
... their diameters and mean densities can be calculated from the small (~1%) fraction of starlight that is occulted as well as knowledge of their stars’ diameters. These planets turn out to have densities similar to those of the gas giants in our solar system and are presumed to be made mostly of hydro ...
... their diameters and mean densities can be calculated from the small (~1%) fraction of starlight that is occulted as well as knowledge of their stars’ diameters. These planets turn out to have densities similar to those of the gas giants in our solar system and are presumed to be made mostly of hydro ...
Document
... the trapped plasma into an unstable magnetic torus orbitting the star (a tokamak). The torus reconnects into self gravitating magnetic spheroids (spheromaks) that become planetary cores. The reconnection radiation and winds heat and compress the disk causing agglomeration out to the snow line. The c ...
... the trapped plasma into an unstable magnetic torus orbitting the star (a tokamak). The torus reconnects into self gravitating magnetic spheroids (spheromaks) that become planetary cores. The reconnection radiation and winds heat and compress the disk causing agglomeration out to the snow line. The c ...
A rocky planet transiting a nearby low-mass star
... altitudes where it could be destroyed by photolysis and its hydrogen rapidly lost to space. When the star was young and bright at ultraviolet wavelengths, an atmosphere with high concentrations of water could lose hydrogen at the diffusion limit, of the order of 1013 atoms per cm2 per second or 10 E ...
... altitudes where it could be destroyed by photolysis and its hydrogen rapidly lost to space. When the star was young and bright at ultraviolet wavelengths, an atmosphere with high concentrations of water could lose hydrogen at the diffusion limit, of the order of 1013 atoms per cm2 per second or 10 E ...
New Worlds on the Horizon: Earth-Sized Planets Close to Other
... conditions that could support life as we understand it? Close-in planets around lowluminosity M dwarfs can orbit within the habitable zone (Fig. 3). However, charged particles in flares from the nearby host star or impacts at the high velocities of these orbits may remove such planets’ atmospheres, ...
... conditions that could support life as we understand it? Close-in planets around lowluminosity M dwarfs can orbit within the habitable zone (Fig. 3). However, charged particles in flares from the nearby host star or impacts at the high velocities of these orbits may remove such planets’ atmospheres, ...
Seeding the Universe with Life
... As Life needs to adapt to diverse environments in space, traits from very different species will become useful in new combinations. For example, self-contained humans living in space will need photosynthesis to create their own food internally. This can be achieved by implanting algae into human ski ...
... As Life needs to adapt to diverse environments in space, traits from very different species will become useful in new combinations. For example, self-contained humans living in space will need photosynthesis to create their own food internally. This can be achieved by implanting algae into human ski ...
Hiroyuki_Hirashita
... Implication for shattering: cs ~ 10 km/s in warm (~ 8000 K) medium → above the shattering threshold (~ a few km/s). Implication for coagulation: vturb grain thermal speed. → If grain motion is coupled with turbulence, grain-grain collision occurs frequently (e.g., Ossenkopf 1993). ...
... Implication for shattering: cs ~ 10 km/s in warm (~ 8000 K) medium → above the shattering threshold (~ a few km/s). Implication for coagulation: vturb grain thermal speed. → If grain motion is coupled with turbulence, grain-grain collision occurs frequently (e.g., Ossenkopf 1993). ...
Here
... to the protostar’s surface. Additional radiated energy comes from nuclear fusion and the quasistatic contraction of the interior. However, these contributions are minor compared to Lacc for low and intermediate masses. It is therefore conventional to define a protostar as a mass-gaining star whose l ...
... to the protostar’s surface. Additional radiated energy comes from nuclear fusion and the quasistatic contraction of the interior. However, these contributions are minor compared to Lacc for low and intermediate masses. It is therefore conventional to define a protostar as a mass-gaining star whose l ...
Transits of planets: mean densities
... therefore the orbital period and the radius ratio between planet and star. Because the radii of stars are quite well known, the planet radius can be derived and with the planet mass from the radial velocity method also the mean density. Planet transits have been detected for more than 1000 stars. Su ...
... therefore the orbital period and the radius ratio between planet and star. Because the radii of stars are quite well known, the planet radius can be derived and with the planet mass from the radial velocity method also the mean density. Planet transits have been detected for more than 1000 stars. Su ...
Habitability and Life Parameters in our Solar System
... Even on a habitable planet with enough radioisotopes to power, various prebiotic molecules are required in order to produce life; therefore, the distribution of these molecules in the galaxy is important in determining the galactic habitable zone. A 2008 study by Samantha Blair and colleagues attemp ...
... Even on a habitable planet with enough radioisotopes to power, various prebiotic molecules are required in order to produce life; therefore, the distribution of these molecules in the galaxy is important in determining the galactic habitable zone. A 2008 study by Samantha Blair and colleagues attemp ...
Asteroids and Comets - Wayne State University
... Origin and Evolution of Comets Comets originate from very great distances The aphelia of new comets are typically around 50,000 AU This clustering of aphelia was first noted by Dutch astronomer Jan Oort in 1950 He then proposed an idea for the origin of those comets, which is still accepted by most ...
... Origin and Evolution of Comets Comets originate from very great distances The aphelia of new comets are typically around 50,000 AU This clustering of aphelia was first noted by Dutch astronomer Jan Oort in 1950 He then proposed an idea for the origin of those comets, which is still accepted by most ...
PDF Full-text
... which would lead to topographical complexity and geochemical cycling [40]. It also is more likely to interact gravitationally with other massive bodies nearby, and to have a more complex planetary history. Density alone does not guarantee any of these things, and different models lead to different p ...
... which would lead to topographical complexity and geochemical cycling [40]. It also is more likely to interact gravitationally with other massive bodies nearby, and to have a more complex planetary history. Density alone does not guarantee any of these things, and different models lead to different p ...
Assessing the Possibility of Biological Complexity on Other
... which would lead to topographical complexity and geochemical cycling [40]. It also is more likely to interact gravitationally with other massive bodies nearby, and to have a more complex planetary history. Density alone does not guarantee any of these things, and different models lead to different p ...
... which would lead to topographical complexity and geochemical cycling [40]. It also is more likely to interact gravitationally with other massive bodies nearby, and to have a more complex planetary history. Density alone does not guarantee any of these things, and different models lead to different p ...
Delineating the Evolution of Organic Molecular Synthesis
... The goal of this project is to reach a deeper understanding of the mechanistic pathway associated with the early synthesis of organic molecules. One considerable challenge lies in the lack of understanding surrounding the process of non-enzymatic carbon fixation. Presently, the only known transfer p ...
... The goal of this project is to reach a deeper understanding of the mechanistic pathway associated with the early synthesis of organic molecules. One considerable challenge lies in the lack of understanding surrounding the process of non-enzymatic carbon fixation. Presently, the only known transfer p ...
A dust ring around Epsilon Eridani: analogue to the young Solar
... The central deficit of emission suggests accumulation of dust into planetesimals (which emit much less per unit mass than individual grains). The ǫ Eri system could thus be analogous to the young Solar System, seen when planet formation is ongoing or complete, but some dust is still present at all r ...
... The central deficit of emission suggests accumulation of dust into planetesimals (which emit much less per unit mass than individual grains). The ǫ Eri system could thus be analogous to the young Solar System, seen when planet formation is ongoing or complete, but some dust is still present at all r ...
June, 2001 AAS poster - David P. Bennett
... These figures show light curves of massive planet events from our VISTA simulations. As the lens mass increases, the probability that the event will pass our time sampling criteria decreases quite sharply as indicated in our “# of detected planets” plot (on page 7). For planets in the 10-100 M⊕ rang ...
... These figures show light curves of massive planet events from our VISTA simulations. As the lens mass increases, the probability that the event will pass our time sampling criteria decreases quite sharply as indicated in our “# of detected planets” plot (on page 7). For planets in the 10-100 M⊕ rang ...
Volume 2 - Euresis Journal
... Other sites in the solar system, such as the moons of Jupiter and Saturn, have not been ruled out yet as sites for some form of life. But, if we are to find more definitive evidence for extraterrestrial life, or the lack thereof, we need to expand the search beyond the confines of the solar system. ...
... Other sites in the solar system, such as the moons of Jupiter and Saturn, have not been ruled out yet as sites for some form of life. But, if we are to find more definitive evidence for extraterrestrial life, or the lack thereof, we need to expand the search beyond the confines of the solar system. ...
Comet Observers Club Chair
... As of 1995, 878 comets have been cataloged and their orbits at least roughly calculated. Of these, 184 are periodic comets (orbital periods less than 200 years); some of the remainder are no doubt periodic as well, but their orbits have not been determined with sufficient accuracy to tell for sure. ...
... As of 1995, 878 comets have been cataloged and their orbits at least roughly calculated. Of these, 184 are periodic comets (orbital periods less than 200 years); some of the remainder are no doubt periodic as well, but their orbits have not been determined with sufficient accuracy to tell for sure. ...
The Distribution of Stars Most Likely to Harbor Intelligent Life
... Fig. 1 Tf as a function of Ti in solar units. Here Ti is the time of appearance of a set of intelligent observers orbiting habitable stars with lifetimes T > Ti . The fraction of these habitable stars with lifetimes between Ti and Tf is f . That is, Tf is the lifetime of the habitable star that divi ...
... Fig. 1 Tf as a function of Ti in solar units. Here Ti is the time of appearance of a set of intelligent observers orbiting habitable stars with lifetimes T > Ti . The fraction of these habitable stars with lifetimes between Ti and Tf is f . That is, Tf is the lifetime of the habitable star that divi ...