THE 2MASS WIDE-FIELD T DWARF SEARCH. II. DISCOVERY OF
... models, since the latter differ only in the absence of an external radiating source (Seager & Sasselov 1998; Seager & Sasselov 2000; Sudarsky et al. 2000; Baraffe et al. 2003). The observed properties of T dwarfs have served to constrain these models. The currently known collection of nearby T dwarfs ...
... models, since the latter differ only in the absence of an external radiating source (Seager & Sasselov 1998; Seager & Sasselov 2000; Sudarsky et al. 2000; Baraffe et al. 2003). The observed properties of T dwarfs have served to constrain these models. The currently known collection of nearby T dwarfs ...
STARLAB
... you told the first time. If time allows, show the Earth Cylinder or other cylinders. Try some activities from your Planetarium Activities for Student Success (PASS) volumes. (Did you send in your Product Registration form? See Note.) 6. It’s important that the students realize that you are learning ...
... you told the first time. If time allows, show the Earth Cylinder or other cylinders. Try some activities from your Planetarium Activities for Student Success (PASS) volumes. (Did you send in your Product Registration form? See Note.) 6. It’s important that the students realize that you are learning ...
- ISP 205, sec 1 - Visions of the
... able to gain gas through the process of bombardment, while Earth has not gained gas in this way. B Earth has lost much more gas to thermal escape than has Venus. C Earth has lost much more atmospheric gas than Venus, primarily to condensation of water vapor into liquid water and to chemical reaction ...
... able to gain gas through the process of bombardment, while Earth has not gained gas in this way. B Earth has lost much more gas to thermal escape than has Venus. C Earth has lost much more atmospheric gas than Venus, primarily to condensation of water vapor into liquid water and to chemical reaction ...
CoRoT III programme
... Because CoRoT is probing effects that were not detectable so far, new types of signal analysis as well as new theoretical tools are being developed. All these data are being interpreted in terms of planetary systems evolution and physical processes in stellar interiors. Most of these results are pub ...
... Because CoRoT is probing effects that were not detectable so far, new types of signal analysis as well as new theoretical tools are being developed. All these data are being interpreted in terms of planetary systems evolution and physical processes in stellar interiors. Most of these results are pub ...
Science Bowl Questions and Answers
... 4,000 Kelvins), and have a large radius-about 100 times that of the Sun. What am I? ANSWER: RED GIANT ASTR-91; Short Answer: A 5th magnitude star is how many times brighter than an 8th magnitude star? ANSWER: 15.85 (accept any answer between 15 and 16) ASTR-91; Multiple Choice: Which of the followin ...
... 4,000 Kelvins), and have a large radius-about 100 times that of the Sun. What am I? ANSWER: RED GIANT ASTR-91; Short Answer: A 5th magnitude star is how many times brighter than an 8th magnitude star? ANSWER: 15.85 (accept any answer between 15 and 16) ASTR-91; Multiple Choice: Which of the followin ...
SOHO`s Frequently Asked Questions
... starts to bubble upwards). By the time the energy gets out to the surface of the Sun, it is spread out over a very large area, so the temperature of any particular location is much lower than it is at the center. In fact, the surface of the Sun is at a temperature of "only" about 5,800 degrees Kelvi ...
... starts to bubble upwards). By the time the energy gets out to the surface of the Sun, it is spread out over a very large area, so the temperature of any particular location is much lower than it is at the center. In fact, the surface of the Sun is at a temperature of "only" about 5,800 degrees Kelvi ...
Full text - FNWI (Science) Education Service Centre
... The group of comets that holds the main focus of this research is the group of dynamical comets on hyperbolic orbits. These comets have eccentricities larger than unity and are thus unbound to any star. From here on out, the term interstellar comets (ISC’s) will represent this particular group of co ...
... The group of comets that holds the main focus of this research is the group of dynamical comets on hyperbolic orbits. These comets have eccentricities larger than unity and are thus unbound to any star. From here on out, the term interstellar comets (ISC’s) will represent this particular group of co ...
Search For Gas Giants Around Late-m Dwarfs - STARS
... M dwarfs. This survey was the first of its kind undertaken to monitor radial velocity variability of these faint dwarfs. For this unique survey we employed the 10-m Keck II on Mauna Kea in Hawaii. With a resolution of 20,000 on the near-infrared spectrograph, NIRSPEC, we monitored these stars over f ...
... M dwarfs. This survey was the first of its kind undertaken to monitor radial velocity variability of these faint dwarfs. For this unique survey we employed the 10-m Keck II on Mauna Kea in Hawaii. With a resolution of 20,000 on the near-infrared spectrograph, NIRSPEC, we monitored these stars over f ...
La Sapienza – 2015
... measure stellar parallaxes with unprecedented precision • Gaia space mission will feature accuracy of ~30micro arc-sec • Gaia is predicted to discover 10,000 planets using astrometry in our local surrounding alone ...
... measure stellar parallaxes with unprecedented precision • Gaia space mission will feature accuracy of ~30micro arc-sec • Gaia is predicted to discover 10,000 planets using astrometry in our local surrounding alone ...
Absolute Flux Calibration
... - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
... - They are quite compact (hence better for extended configurations and/or higher frequencies than planets) and still sufficiently bright (>500mJy@3mm) ...
Astronomy
... Astronomy is a natural science that deals with the study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics, chem ...
... Astronomy is a natural science that deals with the study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics, chem ...
Descartes and sunspots: Matters of fact and systematizing strategies
... third element (terrestrial matter) are neither present in the cosmogony, nor produced by the cosmogonical process. They come into being from (some types of) first matter—and may also be transformed back into it—only during the business as usual cosmological patterns of activity on the surfaces of st ...
... third element (terrestrial matter) are neither present in the cosmogony, nor produced by the cosmogonical process. They come into being from (some types of) first matter—and may also be transformed back into it—only during the business as usual cosmological patterns of activity on the surfaces of st ...
Stellarium User Guide
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
PLUTO - Department of Earth and Planetary Sciences, Northwestern
... solar system (and 'aptly' named) Pluto is more complicated and ambiguous than any other object (with few exceptions) in our solar system. It's lopsided orbit and the fact that it has an atmosphere (at ~50K !!) are jut a start. Its five known moons along with Pluto make up a very complex system of ma ...
... solar system (and 'aptly' named) Pluto is more complicated and ambiguous than any other object (with few exceptions) in our solar system. It's lopsided orbit and the fact that it has an atmosphere (at ~50K !!) are jut a start. Its five known moons along with Pluto make up a very complex system of ma ...
Properties of White Dwarfs, Teacher Guide
... lower than another looks about twice as bright, rather than 5 100 = 2.5 times as bright. ...
... lower than another looks about twice as bright, rather than 5 100 = 2.5 times as bright. ...
Science Case for the Chinese Participation of TMT
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
Stars, Galaxies, and Beyond
... manageable look at astronomy and astrophysics applying to space well beyond the solar system. It is likely that humankind will not reach other stars or galaxies in the foreseeable future, but our understanding of our place in the universe is remarkably enriched by pursuing this knowledge. I thank pr ...
... manageable look at astronomy and astrophysics applying to space well beyond the solar system. It is likely that humankind will not reach other stars or galaxies in the foreseeable future, but our understanding of our place in the universe is remarkably enriched by pursuing this knowledge. I thank pr ...
Multiplicity in Early Stellar Evolution - Astronomy Group
... cluster formation, other groups have instead pursued highresolution core scale simulations of HD collapse of much lower mass, initially Bonnor-Ebert-like clouds, delineating how factors such as the initial rotation rate, metallicity, turbulence, and density determine whether the cloud forms a single ...
... cluster formation, other groups have instead pursued highresolution core scale simulations of HD collapse of much lower mass, initially Bonnor-Ebert-like clouds, delineating how factors such as the initial rotation rate, metallicity, turbulence, and density determine whether the cloud forms a single ...
manual .
... motions of the planets. The later explanation of this simplicity is the origin of modern physical science. The empirical discovery of laws of planetary motion by Johannes Kepler around 1600, and the dynamical explanation of these laws by Isaac Newton around 1685 form a remarkable chapter in the hist ...
... motions of the planets. The later explanation of this simplicity is the origin of modern physical science. The empirical discovery of laws of planetary motion by Johannes Kepler around 1600, and the dynamical explanation of these laws by Isaac Newton around 1685 form a remarkable chapter in the hist ...
2 Justification and benefits in joining TMT
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
... questions with the next generation extremely large class telescopes such as the Thirty Meter Telescope (TMT). The Chinese participation in the TMT will place China in the forefront of astronomy for many decades to come; it can be a transformational experience for Chinese astronomy in terms of scienc ...
Proposal - ESA Science
... ESA’s Cosmic Vision aims to investigate what are the conditions for planet formation and the emergence of life? For this, one must investigate and characterise extra-Solar planets. Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like p ...
... ESA’s Cosmic Vision aims to investigate what are the conditions for planet formation and the emergence of life? For this, one must investigate and characterise extra-Solar planets. Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like p ...
Clusters: age scales for stellar physics
... In order to define an age scale (or several), it is very important to keep in mind that we cannot make experiments except in very few situations and we rely on observations and theory. Thus, observational phenomena with very well defined ages, our anchors, are extremely important. As a matter of fac ...
... In order to define an age scale (or several), it is very important to keep in mind that we cannot make experiments except in very few situations and we rely on observations and theory. Thus, observational phenomena with very well defined ages, our anchors, are extremely important. As a matter of fac ...
Multiplicity in Early Stellar Evolution
... While powerful theoretical tools now exist, along with widespread access to large computational clusters, the huge volume of parameter space that needs to be explored has to date prevented a comprehensive theoretical picture from emerging. Nevertheless, it is clear that in spite of the various magne ...
... While powerful theoretical tools now exist, along with widespread access to large computational clusters, the huge volume of parameter space that needs to be explored has to date prevented a comprehensive theoretical picture from emerging. Nevertheless, it is clear that in spite of the various magne ...
Planet X, Comets and Earth Changes
... There are few people who would have the tenacity to pursue and uphold their beliefs for as long as he has had to do in facing the odds pitted against him over the past decades, and to emerge in tact with as full a commitment as when he started that long ago. His personal philosophy states that he wi ...
... There are few people who would have the tenacity to pursue and uphold their beliefs for as long as he has had to do in facing the odds pitted against him over the past decades, and to emerge in tact with as full a commitment as when he started that long ago. His personal philosophy states that he wi ...
Untitled - NMSU Astronomy
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
Planetary habitability
Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and sustain life. Life may develop directly on a planet or satellite or be transferred to it from another body, a theoretical process known as panspermia. As the existence of life beyond Earth is unknown, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear favourable to life's flourishing—in particular those factors that have sustained complex, multicellular organisms and not just simpler, unicellular creatures. Research and theory in this regard is a component of planetary science and the emerging discipline of astrobiology.An absolute requirement for life is an energy source, and the notion of planetary habitability implies that many other geophysical, geochemical, and astrophysical criteria must be met before an astronomical body can support life. In its astrobiology roadmap, NASA has defined the principal habitability criteria as ""extended regions of liquid water, conditions favourable for the assembly of complex organic molecules, and energy sources to sustain metabolism.""In determining the habitability potential of a body, studies focus on its bulk composition, orbital properties, atmosphere, and potential chemical interactions. Stellar characteristics of importance include mass and luminosity, stable variability, and high metallicity. Rocky, terrestrial-type planets and moons with the potential for Earth-like chemistry are a primary focus of astrobiological research, although more speculative habitability theories occasionally examine alternative biochemistries and other types of astronomical bodies.The idea that planets beyond Earth might host life is an ancient one, though historically it was framed by philosophy as much as physical science. The late 20th century saw two breakthroughs in the field. The observation and robotic spacecraft exploration of other planets and moons within the Solar System has provided critical information on defining habitability criteria and allowed for substantial geophysical comparisons between the Earth and other bodies. The discovery of extrasolar planets, beginning in the early 1990s and accelerating thereafter, has provided further information for the study of possible extraterrestrial life. These findings confirm that the Sun is not unique among stars in hosting planets and expands the habitability research horizon beyond the Solar System.The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the Universe was only 10–17 million years old. According to the panspermia hypothesis, microscopic life—distributed by meteoroids, asteroids and other small Solar System bodies—may exist throughout the universe. Nonetheless, Earth is the only place in the universe known to harbor life. Estimates of habitable zones around other stars, along with the discovery of hundreds of extrasolar planets and new insights into the extreme habitats here on Earth, suggest that there may be many more habitable places in the universe than considered possible until very recently. On 4 November 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs within the Milky Way. 11 billion of these estimated planets may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists.