Grades 9-12 - pdf - McDonald Observatory
... cold telescope (cooler than the light source) above Earth’s atmosphere to collect and detect infrared light. Once we have this, we can study the light of stars in distant galaxies, study the origin of those stars in the dusty clouds in our own and other galaxies, and study the disks that form planet ...
... cold telescope (cooler than the light source) above Earth’s atmosphere to collect and detect infrared light. Once we have this, we can study the light of stars in distant galaxies, study the origin of those stars in the dusty clouds in our own and other galaxies, and study the disks that form planet ...
No-Added Formaldehyde Medium Density
... Depending on species of wood, wood dust may cause allergic dermatitis from repetitive contact at elevated levels. Certain elevated levels and prolonged exposures to wood dust have been associated with nasal cancer. IARC classifies wood dust, depending on species, as a carcinogen to humans (group 1). ...
... Depending on species of wood, wood dust may cause allergic dermatitis from repetitive contact at elevated levels. Certain elevated levels and prolonged exposures to wood dust have been associated with nasal cancer. IARC classifies wood dust, depending on species, as a carcinogen to humans (group 1). ...
Nebulae - Innovative Teachers BG
... the ionization process - the recombination, in which the hydrogen nuclei “wrap back” electrons. During re-combination every electron releases energy in different wavelengths and the cloud begins “to shine”. Under certain conditions of the cloud matter – the temperature and density - the hydrogen ato ...
... the ionization process - the recombination, in which the hydrogen nuclei “wrap back” electrons. During re-combination every electron releases energy in different wavelengths and the cloud begins “to shine”. Under certain conditions of the cloud matter – the temperature and density - the hydrogen ato ...
Sample pages 1 PDF
... holy, and unchanging. Since the time of Aristotle, the celestial sphere was seen to be separate and detached from the terrestrial earth, where hurricanes, floods, volcanos, earthquakes, and other unpredictable misfortunes happen. In religious circles, such calamities were commonly believed to be cau ...
... holy, and unchanging. Since the time of Aristotle, the celestial sphere was seen to be separate and detached from the terrestrial earth, where hurricanes, floods, volcanos, earthquakes, and other unpredictable misfortunes happen. In religious circles, such calamities were commonly believed to be cau ...
- Department of Chemistry, York University
... *More than 70 different amino acids were detected in the Murchison meteorite! ...
... *More than 70 different amino acids were detected in the Murchison meteorite! ...
astrochemistry_caselli
... The timescale on which almost all carbon becomes contained in CO (nO > nC) is at least equal to the timescale for one hydrogen molecule to be ionized for every C: nC/[ n(H2)] = 2 nC/[ nH] For = 610-17 s-1 and nC/nH = 10-4, the above expression gives a value of 105 yr. ...
... The timescale on which almost all carbon becomes contained in CO (nO > nC) is at least equal to the timescale for one hydrogen molecule to be ionized for every C: nC/[ n(H2)] = 2 nC/[ nH] For = 610-17 s-1 and nC/nH = 10-4, the above expression gives a value of 105 yr. ...
Effect Of Convection For Gaseous Hydrochloride
... and 60% of scrap, containing number of different metals. Some of them, Ni, Cr, V make steel better etc., however metals like Zn, Cd, Pb are unwelcome. In modern steelmaking equipment using oxygen atmosphere in presence of lime, C is removed as CO gas, Si, P and S form slag. Small percentage of Fe is ...
... and 60% of scrap, containing number of different metals. Some of them, Ni, Cr, V make steel better etc., however metals like Zn, Cd, Pb are unwelcome. In modern steelmaking equipment using oxygen atmosphere in presence of lime, C is removed as CO gas, Si, P and S form slag. Small percentage of Fe is ...
Scientific requirements of ALMA, and its capabilities for key
... Image gas kinematics in protostars and protoplanetary disks around Sun-like stars at 140pc distance, enabling one to study their physical, chemical and magnetic field structures and to detect the gaps created by planets undergoing formation in the disk. Provide precise images at 0.1 arcsec resolutio ...
... Image gas kinematics in protostars and protoplanetary disks around Sun-like stars at 140pc distance, enabling one to study their physical, chemical and magnetic field structures and to detect the gaps created by planets undergoing formation in the disk. Provide precise images at 0.1 arcsec resolutio ...
Observing Nebulosities: The Cygnus Superbubble Chris
... possibly located along the line of sight. Indeed, recent X-ray emission findings (Uyaniker et al. 2001) suggest that the dominant nebulosity in the Cygnus field, Sh 2-109 (Sharpless, 1959), consists of overlapping, not physically related, features. According to current theories, stars form in clouds ...
... possibly located along the line of sight. Indeed, recent X-ray emission findings (Uyaniker et al. 2001) suggest that the dominant nebulosity in the Cygnus field, Sh 2-109 (Sharpless, 1959), consists of overlapping, not physically related, features. According to current theories, stars form in clouds ...
Delineating the Evolution of Organic Molecular Synthesis
... Diversity in the chemical and physical compositions of ice mantles is critical to understanding the process of chemical evolution in the interstellar medium and protoplanetary disks [3, 5]. Ice mantles are implicated as a site (among others discussed later) of molecular synthesis. Planetary formatio ...
... Diversity in the chemical and physical compositions of ice mantles is critical to understanding the process of chemical evolution in the interstellar medium and protoplanetary disks [3, 5]. Ice mantles are implicated as a site (among others discussed later) of molecular synthesis. Planetary formatio ...
Extinction curves in AGN
... It is definitively hard to go beyond the statement made by Richards et al. (2003), which is ...
... It is definitively hard to go beyond the statement made by Richards et al. (2003), which is ...
The IR Universe
... Spitzer has found optically invisible galaxies so distant that we see them as they were only 3 billion years after the Big Bang. These galaxies are obscured by silicate dust, suggesting that planets could have formed even at this early time in the history of the Universe. ...
... Spitzer has found optically invisible galaxies so distant that we see them as they were only 3 billion years after the Big Bang. These galaxies are obscured by silicate dust, suggesting that planets could have formed even at this early time in the history of the Universe. ...
In the icy near-vacuum of interstellar space are seething
... shields the gas within a cloud's deep interior from the effects of radiation from older, adjacent stars; dust grains provide surfaces on which chemical reactions can take place and dust radiates energy from the cloud during the star's early, formative stages. And yet these tiny grains—of uncertain c ...
... shields the gas within a cloud's deep interior from the effects of radiation from older, adjacent stars; dust grains provide surfaces on which chemical reactions can take place and dust radiates energy from the cloud during the star's early, formative stages. And yet these tiny grains—of uncertain c ...
On the Nature of the Dust in the Debris Disk Around HD69830
... exceeded the mass of any known comet suggesting an asteroidal rather than a cometary origin for the debris. However, the quality of their fit was less than ideal, as the nature of the dust in the two systems is significantly different upon detailed examination. In this work, a more sophisticated spe ...
... exceeded the mass of any known comet suggesting an asteroidal rather than a cometary origin for the debris. However, the quality of their fit was less than ideal, as the nature of the dust in the two systems is significantly different upon detailed examination. In this work, a more sophisticated spe ...
... rates of about 2 to 50 oC per hour. Most chondrules cooled faster, about 100-1000 oC per hour. The experiments also suggest that chondrules and CAIs formed from pre-existing solids, and chondrules were probably recycled through the melting process several times. Thus, these components record the eff ...
Star Formation - Leslie Looney
... stick too? In fact, we see water (H2O), ammonia (NH3), methane (CH4), and methanol (CH3OH) frozen to the dust grains. •! Hey, that’s the most important bioelements (H, O, N, and C) on dust grains! •! Mayo Greenberg and co-workers studied these ices in the lab and by adding a little of ultraviolet li ...
... stick too? In fact, we see water (H2O), ammonia (NH3), methane (CH4), and methanol (CH3OH) frozen to the dust grains. •! Hey, that’s the most important bioelements (H, O, N, and C) on dust grains! •! Mayo Greenberg and co-workers studied these ices in the lab and by adding a little of ultraviolet li ...
Our galaxy, the Milky Way, has about 3 billion solar masses of HI
... direction – called parallel spins. The state of parallel spins is just ever so slightly higher in energy – thus parallel spins represent an excited state of the hydrogen atom. The lower energy antiparallel spins represent the lower ground state. The energy difference between these two states is so s ...
... direction – called parallel spins. The state of parallel spins is just ever so slightly higher in energy – thus parallel spins represent an excited state of the hydrogen atom. The lower energy antiparallel spins represent the lower ground state. The energy difference between these two states is so s ...
A dust ring around Epsilon Eridani: analogue to the young Solar
... south of the star. However, the signal level in this region is uncertain, as it includes less than 10 map pixels. The most probable explanation for the ring-like structure is a young analogue of the Kuiper Belt. The central deficit of emission suggests accumulation of dust into planetesimals (which ...
... south of the star. However, the signal level in this region is uncertain, as it includes less than 10 map pixels. The most probable explanation for the ring-like structure is a young analogue of the Kuiper Belt. The central deficit of emission suggests accumulation of dust into planetesimals (which ...
An Unbiased Near-infrared Interferometric Survey for Hot
... for the statistical analysis. The targets for both surveys were selected carefully in order to avoid any relevant selection bias that could affect the statistics. In addition to the higher efficiency, PIONIER provides a few advantages over FLUOR. The simultaneous use of four telescopes allows the ...
... for the statistical analysis. The targets for both surveys were selected carefully in order to avoid any relevant selection bias that could affect the statistics. In addition to the higher efficiency, PIONIER provides a few advantages over FLUOR. The simultaneous use of four telescopes allows the ...
Astro 10: Introductory Astronomy
... • The “Fast” scenario: eddys form, merge. Eddys include not just dust (which is only ~2% of total mass recall), but hydrogen and helium as well (much more mass here). The growth rate would be much faster as gravity would kick in right away for such massive objects. ...
... • The “Fast” scenario: eddys form, merge. Eddys include not just dust (which is only ~2% of total mass recall), but hydrogen and helium as well (much more mass here). The growth rate would be much faster as gravity would kick in right away for such massive objects. ...
Stardust--Snapshots of Stars
... technique on the NanoSIMS that expands on automated methods developed in the early 2000s to study presolar grains . Preserved in primitive meteorites, presolar grains are literally stardust that formed in ancient stellar outflows and ejecta from supernova explosions, and became part of the molecular ...
... technique on the NanoSIMS that expands on automated methods developed in the early 2000s to study presolar grains . Preserved in primitive meteorites, presolar grains are literally stardust that formed in ancient stellar outflows and ejecta from supernova explosions, and became part of the molecular ...
Basic Debris Disk Model - Institute of Astronomy
... published Spitzer observations may not have had sufficient resolution to detect this (Su et al. 2005) ...
... published Spitzer observations may not have had sufficient resolution to detect this (Su et al. 2005) ...
PDF of story and photos
... dust streaming from its body like spokes on a wheel. Astronomers spotted the asteroid in our solar system’s asteroid belt, a reservoir of space rocks between the orbits of Mars and Jupiter. Asteroids are some of the leftover debris from the construction of our solar system 5 billion years ago. The o ...
... dust streaming from its body like spokes on a wheel. Astronomers spotted the asteroid in our solar system’s asteroid belt, a reservoir of space rocks between the orbits of Mars and Jupiter. Asteroids are some of the leftover debris from the construction of our solar system 5 billion years ago. The o ...
Into the sub-mm
... redshift 2 galaxy), is that there are far more than predicted from other wavelengths. A further factor, often overlooked, was discussed. This is source confusion, a major aspect for deep submillimetre surveys. Andrew showed that this will be a major problem for facilities with limited angular resolu ...
... redshift 2 galaxy), is that there are far more than predicted from other wavelengths. A further factor, often overlooked, was discussed. This is source confusion, a major aspect for deep submillimetre surveys. Andrew showed that this will be a major problem for facilities with limited angular resolu ...
Cosmic dust
Cosmic dust is dust which exists in space. It is for the most part a type of small dust particles which are a few molecules to 0.1 µm in size. A smaller fraction of all dust in space consists of larger refractory minerals that condensed as matter left the stars. It is called ""stardust"" and is included in a separate section below. The dust density in the local interstellar medium of the Local Bubble is approximately 10−6 × dust grain/m3 with each grain having a mass of approximately 10−17 kg.Cosmic dust can be further distinguished by its astronomical location: intergalactic dust, interstellar dust, interplanetary dust (such as in the zodiacal cloud) and circumplanetary dust (such as in a planetary ring). In the Solar System, interplanetary dust causes the zodiacal light. Sources of Solar System dust include comet dust, asteroidal dust, dust from the Kuiper belt, and interstellar dust passing through the Solar System. The terminology has no specific application for describing materials found on the planet Earth except for dust that has demonstrably fallen to Earth. By one estimate, as much as 40,000 tons of cosmic dust reaches the Earth's surface every year. In October 2011, scientists reported that cosmic dust contains complex organic matter (""amorphous organic solids with a mixed aromatic–aliphatic structure"") that could be created naturally, and rapidly, by stars.On August 14, 2014, scientists announced the collection of possible interstellar dust particles from the Stardust spacecraft since returning to Earth in 2006.