here - Ira-Inaf
... of H2CO, and Kasting (1993) developed atmospheric models of early Earth in an effort to address the conditions under which H2CO could have formed. In contrast to the above, there is evidence that the early terrestrial atmosphere may have been more neutral than reducing (Kasting and Catling, 2003). I ...
... of H2CO, and Kasting (1993) developed atmospheric models of early Earth in an effort to address the conditions under which H2CO could have formed. In contrast to the above, there is evidence that the early terrestrial atmosphere may have been more neutral than reducing (Kasting and Catling, 2003). I ...
Life Beyond Earth Exhibition
... exhibits housed in the Our Place In Space area of the building. Major sections of the exhibition cover the vastness of the universe, places in the solar system where life could exist, the search for exoplanets, and questions that remain to be answered. The exhibit includes several iconic elements. A ...
... exhibits housed in the Our Place In Space area of the building. Major sections of the exhibition cover the vastness of the universe, places in the solar system where life could exist, the search for exoplanets, and questions that remain to be answered. The exhibit includes several iconic elements. A ...
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... A5V). For more than a decade, this system has been under intense scrutiny because of its suspected similarity to either a forming or a young planetary system. With the growing realization that planetary systems are not uncommon, we are more than ever motivated to tackle questions such as how similar ...
... A5V). For more than a decade, this system has been under intense scrutiny because of its suspected similarity to either a forming or a young planetary system. With the growing realization that planetary systems are not uncommon, we are more than ever motivated to tackle questions such as how similar ...
Other Planetary Systems
... Now let’s add in the effects of Saturn, which exerts the second greatest gravitational tug on the Sun. Saturn takes 29.5 years to orbit the Sun, so by itself it would cause the Sun to orbit their mutual center of mass every 29.5 years. However, because Saturn’s influence is secondary to that of Jupi ...
... Now let’s add in the effects of Saturn, which exerts the second greatest gravitational tug on the Sun. Saturn takes 29.5 years to orbit the Sun, so by itself it would cause the Sun to orbit their mutual center of mass every 29.5 years. However, because Saturn’s influence is secondary to that of Jupi ...
The dust temperatures of the pre-stellar cores in the ρ Oph main
... Each clump is surrounded by a virtual ambient cloud, which has a uniform density. The role of these ambient clouds is to modify the ambient radiation field that heats each clump externally. The optical extinction through the ambient cloud is chosen so that the peak of computed SED of each clump corr ...
... Each clump is surrounded by a virtual ambient cloud, which has a uniform density. The role of these ambient clouds is to modify the ambient radiation field that heats each clump externally. The optical extinction through the ambient cloud is chosen so that the peak of computed SED of each clump corr ...
The physics of star formation
... suggests that the shapes of molecular clouds may be created by turbulence (Falgarone and Phillips 1991; Falgarone et al 1991). Molecular clouds are the densest parts of the interstellar medium, and they are surrounded by less dense envelopes of atomic gas. The abundance of molecules increases with d ...
... suggests that the shapes of molecular clouds may be created by turbulence (Falgarone and Phillips 1991; Falgarone et al 1991). Molecular clouds are the densest parts of the interstellar medium, and they are surrounded by less dense envelopes of atomic gas. The abundance of molecules increases with d ...
October 2013 - Skyscrapers, Inc.
... not show any parallax (difference in position as seen from multiple locations). These observations indicated that the comet was well outside of the Earth’s atmosphere. But if these celestial objects were out roaming amongst the planets of our solar system, where did they come from? Most all comets o ...
... not show any parallax (difference in position as seen from multiple locations). These observations indicated that the comet was well outside of the Earth’s atmosphere. But if these celestial objects were out roaming amongst the planets of our solar system, where did they come from? Most all comets o ...
Astronomy 150 The Planets
... This worksheet gives some examples of the types of gravity problems you will see on the midterm and final exams. This is almost the only math you will ever have to do on an exam. Make sure you really understand how to do each of these problems. For each of these problems, make sure you show all of y ...
... This worksheet gives some examples of the types of gravity problems you will see on the midterm and final exams. This is almost the only math you will ever have to do on an exam. Make sure you really understand how to do each of these problems. For each of these problems, make sure you show all of y ...
Nebulae.The Lagoon and Dumbbell Nebulae
... The nebulae often have star-forming regions, such as the Eagle nebula. Part of this nebula is shown in one of the most famous NASA photos - Pillars of Creation. In these regions, gas and dust gather together to form bigger and bigger volumes of matter. After reaching a crucial point, the mass of the ...
... The nebulae often have star-forming regions, such as the Eagle nebula. Part of this nebula is shown in one of the most famous NASA photos - Pillars of Creation. In these regions, gas and dust gather together to form bigger and bigger volumes of matter. After reaching a crucial point, the mass of the ...
interstellar dust - Ira-Inaf
... Solid particles pervade interstellar space in the Milky Way and other galaxies It occurs in a wide variety of astrophysical enviroments, from comets to giant molecular clouds, from circumstellar shells to galactic nuclei. ...
... Solid particles pervade interstellar space in the Milky Way and other galaxies It occurs in a wide variety of astrophysical enviroments, from comets to giant molecular clouds, from circumstellar shells to galactic nuclei. ...
Multiple scattering polarization
... source of energy and the thermal radiation from brown dwarfs arises from the release of gravitational potential energy during their formation and governed by the interaction with the atmospheric material [5]. The distinct features of the spectra of brown dwarfs, e.g., gradual disappearance of VO, Ti ...
... source of energy and the thermal radiation from brown dwarfs arises from the release of gravitational potential energy during their formation and governed by the interaction with the atmospheric material [5]. The distinct features of the spectra of brown dwarfs, e.g., gradual disappearance of VO, Ti ...
The physics of star formation - Yale Astronomy
... where the gas becomes dense enough for its self-gravity to overcome these tidal forces, for example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation m ...
... where the gas becomes dense enough for its self-gravity to overcome these tidal forces, for example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation m ...
The physics of star formation
... where the gas becomes dense enough for its self-gravity to overcome these tidal forces, for example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation m ...
... where the gas becomes dense enough for its self-gravity to overcome these tidal forces, for example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’ (GMCs), turbulence and magnetic fields may be the most important effects counteracting gravity, and star formation m ...
Constraints on a Chance Universe & The Anthropic Principle
... fp - the fraction of stars that have planets similar to Earth Based on the most recent successes in finding extrasolar planets orbiting distant stars, it would seem that the value of the first ½ of this factor would be rather high. Optimists placing its value at 1.0 and pessimists at 0.1 (about 10% ...
... fp - the fraction of stars that have planets similar to Earth Based on the most recent successes in finding extrasolar planets orbiting distant stars, it would seem that the value of the first ½ of this factor would be rather high. Optimists placing its value at 1.0 and pessimists at 0.1 (about 10% ...
Accretion and Current Discs Controlled by Strong Magnetic Field
... where c is light velocity. There are three basic modes of interaction of a neutron star with a surrounding disc: accretor, propeller, and ejector [15-17]. If the inner radius of the disc is beyond the corotation radius, but smaller than the light cylinder radius, the system is expected to be in the ...
... where c is light velocity. There are three basic modes of interaction of a neutron star with a surrounding disc: accretor, propeller, and ejector [15-17]. If the inner radius of the disc is beyond the corotation radius, but smaller than the light cylinder radius, the system is expected to be in the ...
Galactic Chemical Evolution and the Oxygen Isotopic Composition
... clouds may be self-enriched by the very massive stars they spawn. Malinie et al. (1993) proposed that star formation was both heterogeneous and bursting (episodic), and different parts of the galactic disk mix only after 0.1-1 Gyr had elapsed. Thomas et al. (1998) relaxed the IMA, dividing the ISM i ...
... clouds may be self-enriched by the very massive stars they spawn. Malinie et al. (1993) proposed that star formation was both heterogeneous and bursting (episodic), and different parts of the galactic disk mix only after 0.1-1 Gyr had elapsed. Thomas et al. (1998) relaxed the IMA, dividing the ISM i ...
The ages of pre-main-sequence stars
... models in this range. We describe our models in detail in the following sections, but note that, because we use very similar physics, they do not differ greatly from those of D'Antona & Mazzitelli. However, stars do continue to accrete long after their photospheres are exposed, and they can be place ...
... models in this range. We describe our models in detail in the following sections, but note that, because we use very similar physics, they do not differ greatly from those of D'Antona & Mazzitelli. However, stars do continue to accrete long after their photospheres are exposed, and they can be place ...
SPIRou Science Case
... mostly out of reach of existing instruments. In particular, carrying out a new largescale survey at nIR wavelengths will boost the sensitivity to habitable exo-Earths by typically an order of magnitude on planetary mass (with respect to existing instruments). SPIRou will also work in close collabora ...
... mostly out of reach of existing instruments. In particular, carrying out a new largescale survey at nIR wavelengths will boost the sensitivity to habitable exo-Earths by typically an order of magnitude on planetary mass (with respect to existing instruments). SPIRou will also work in close collabora ...
Dust production in debris discs: constraints on the smallest grains
... Aims. We numerically investigate the importance of this effect to find out under which conditions it can leave a signature in the small-size end of a disc’s particle size distribution (PSD). An important part of this work is to map out, in a disc at steady-state, what is the most likely collisional o ...
... Aims. We numerically investigate the importance of this effect to find out under which conditions it can leave a signature in the small-size end of a disc’s particle size distribution (PSD). An important part of this work is to map out, in a disc at steady-state, what is the most likely collisional o ...
The Most Luminous Protostars in Molecular Clouds: A Hint to
... (Dobashi et al. 1996), which was first pointed out by Sugitani et al. (1989) and was more recently confirmed by Yamaguchi et al. (1999). However, the cloud mass range for which we and other authors determined the LMAX –MCL relation was limited to 10 < MCL /M < 104 . It has been our particular inter ...
... (Dobashi et al. 1996), which was first pointed out by Sugitani et al. (1989) and was more recently confirmed by Yamaguchi et al. (1999). However, the cloud mass range for which we and other authors determined the LMAX –MCL relation was limited to 10 < MCL /M < 104 . It has been our particular inter ...
Masses of Dwarf Satellites of the Milky Way
... Q, for 526 subhaloes in the main halo of the Aq-A-1 simulation. haloes considered contain between 20 000 and nearly ∼10 million . The lines in different colours show averages in logarithmic mass each of the three profiles. ...
... Q, for 526 subhaloes in the main halo of the Aq-A-1 simulation. haloes considered contain between 20 000 and nearly ∼10 million . The lines in different colours show averages in logarithmic mass each of the three profiles. ...
Radial Velocity - Yale Exoplanet
... Catalogue of Stellar Radial Velocities (Wilson 1953) with a typical precision of 750 m s−1 , not the precision that is typically associated with planet-hunting. However, at that time, Otto Struve proposed that high precision stellar radial velocity work could be used to search for planets orbiting n ...
... Catalogue of Stellar Radial Velocities (Wilson 1953) with a typical precision of 750 m s−1 , not the precision that is typically associated with planet-hunting. However, at that time, Otto Struve proposed that high precision stellar radial velocity work could be used to search for planets orbiting n ...
Downloaded - Royal Society Open Science
... planetary literature; I attempt to consolidate these references. In figure 2, I characterize distances from the star in which various forces are important, or might be important. This figure may be used as a guide when modelling a particular system or set of systems. Table 1 lists some notable post- ...
... planetary literature; I attempt to consolidate these references. In figure 2, I characterize distances from the star in which various forces are important, or might be important. This figure may be used as a guide when modelling a particular system or set of systems. Table 1 lists some notable post- ...
Effect of the stellar spin history on the tidal evolution of close
... use a dissipation factor of σ∗,dM = 2.006 ×10−60 g−1 cm−2 s−1 for the 0.1 M stars in our calculations (Hansen 2010). No scaling of the M-dwarf dissipation factor has been performed compared to the brown dwarf value. In this work, we varied the stellar dissipation factor by a few orders of magnitude ...
... use a dissipation factor of σ∗,dM = 2.006 ×10−60 g−1 cm−2 s−1 for the 0.1 M stars in our calculations (Hansen 2010). No scaling of the M-dwarf dissipation factor has been performed compared to the brown dwarf value. In this work, we varied the stellar dissipation factor by a few orders of magnitude ...
How we think the planets were born
... "There cannot be more worlds than one.” - Aristotle (384-332 BC) "There are innumerable worlds which differ in size. In some worlds there is no sun and moon, in others they are larger than in our world, and in others more numerous. They are destroyed by colliding with each other. There are some worl ...
... "There cannot be more worlds than one.” - Aristotle (384-332 BC) "There are innumerable worlds which differ in size. In some worlds there is no sun and moon, in others they are larger than in our world, and in others more numerous. They are destroyed by colliding with each other. There are some worl ...