Lecture Eight (Powerpoint format) - Flash
... complex structure to the ISM. Most of the gas is concentrated in “clouds” of various types, and ranges from tens to millions of degrees in temperature. Hydrogen clouds -- an “average” interstellar cloud containing mostly atomic hydrogen at hundreds to thousands of degrees, with roughly a few ato ...
... complex structure to the ISM. Most of the gas is concentrated in “clouds” of various types, and ranges from tens to millions of degrees in temperature. Hydrogen clouds -- an “average” interstellar cloud containing mostly atomic hydrogen at hundreds to thousands of degrees, with roughly a few ato ...
Search for Other Worlds - Science fiction 20 years
... 12. Astrometry is the measurement of stellar positions on the celestial sphere. This method consists of precisely measuring a star's position in the sky, and then making observations of the movement of the star over time. If the star has an orbiting planet or planets, then the gravitational influenc ...
... 12. Astrometry is the measurement of stellar positions on the celestial sphere. This method consists of precisely measuring a star's position in the sky, and then making observations of the movement of the star over time. If the star has an orbiting planet or planets, then the gravitational influenc ...
Chapter 10
... nebulae are blue. Why are these colors different from what Wien's law tells us about the radiation emitted by a blackbody? a. The gases in an emission nebula do not emit light like a blackbody. b. We see reflection nebulae by reflected light, not emitted light. c. The dust grains in reflection nebul ...
... nebulae are blue. Why are these colors different from what Wien's law tells us about the radiation emitted by a blackbody? a. The gases in an emission nebula do not emit light like a blackbody. b. We see reflection nebulae by reflected light, not emitted light. c. The dust grains in reflection nebul ...
absorption lines
... nebulae are blue. Why are these colors different from what Wien's law tells us about the radiation emitted by a blackbody? a. The gases in an emission nebula do not emit light like a blackbody. b. We see reflection nebulae by reflected light, not emitted light. c. The dust grains in reflection nebul ...
... nebulae are blue. Why are these colors different from what Wien's law tells us about the radiation emitted by a blackbody? a. The gases in an emission nebula do not emit light like a blackbody. b. We see reflection nebulae by reflected light, not emitted light. c. The dust grains in reflection nebul ...
Planet migration
... and is responsible for Kuiper belt structure (e.g., Hahn & Malhotra 1999) Migration faster in more massive disk (Gomes et al. 2004), and can reverse when planet encounters planetesimal disk outer edge ...
... and is responsible for Kuiper belt structure (e.g., Hahn & Malhotra 1999) Migration faster in more massive disk (Gomes et al. 2004), and can reverse when planet encounters planetesimal disk outer edge ...
View PDF - Sara Seager
... thousands of known exoplanets and planet candidates are extremely diverse in terms of their masses atmospheres orbiting main-sequence stars [see (10) or sizes, orbits, and host star type. The diversity extends to new kinds of planets, which are very and references therein]. This article reviews upco ...
... thousands of known exoplanets and planet candidates are extremely diverse in terms of their masses atmospheres orbiting main-sequence stars [see (10) or sizes, orbits, and host star type. The diversity extends to new kinds of planets, which are very and references therein]. This article reviews upco ...
chapter16StarBirth
... particles/cm3) must contain at least a few hundred solar masses for gravity to overcome pressure • Emission lines from molecules in a cloud can prevent a pressure buildup by converting thermal energy into infrared and radio photons that escape the cloud. If there are no molecules, but only H, He, Li ...
... particles/cm3) must contain at least a few hundred solar masses for gravity to overcome pressure • Emission lines from molecules in a cloud can prevent a pressure buildup by converting thermal energy into infrared and radio photons that escape the cloud. If there are no molecules, but only H, He, Li ...
powerpoint - High Energy Physics at Wayne State
... Estimated 1012 comets in the Oort cloud. 10 times this number of comets could be orbiting the Sun between the planets and the Oort cloud. Such objects undiscovered because to small, to reflect sufficient light to be detectable at large distances, and because their stable orbit do not bring them clos ...
... Estimated 1012 comets in the Oort cloud. 10 times this number of comets could be orbiting the Sun between the planets and the Oort cloud. Such objects undiscovered because to small, to reflect sufficient light to be detectable at large distances, and because their stable orbit do not bring them clos ...
East Valley Astronomy Club
... If true, the planets formed closer to the Sun, which speeds up their formation, but still not < 10 Myr. However, if the planets formed closer together, the Minimum Mass Solar Nebula must be wrong! The planets were spread out from 5-15 AU, not 5-30 AU. One quarter the area = 4 x denser!! ...
... If true, the planets formed closer to the Sun, which speeds up their formation, but still not < 10 Myr. However, if the planets formed closer together, the Minimum Mass Solar Nebula must be wrong! The planets were spread out from 5-15 AU, not 5-30 AU. One quarter the area = 4 x denser!! ...
Our solar system
... Summary of Chapter 4, cont. • Four inner planets – terrestrial planets – are rocky, small, and dense. • Four outer planets – Jovian planets – are gaseous and large. • Nebular theory of solar system formation: Cloud of gas and dust gradually collapsed under ...
... Summary of Chapter 4, cont. • Four inner planets – terrestrial planets – are rocky, small, and dense. • Four outer planets – Jovian planets – are gaseous and large. • Nebular theory of solar system formation: Cloud of gas and dust gradually collapsed under ...
Seeing another Earth: Detecting and Characterizing Rocky Planets
... In the past decade, astronomers have discovered nearly 1000 planetary systems. Microlensing, radial velocity, and transit surveys have yielded more than 300 planets with masses ranging from a few Earth masses (ME) to 20-30 Jupiter masses (MJ). Observations in the thermal infrared with the IRAS and S ...
... In the past decade, astronomers have discovered nearly 1000 planetary systems. Microlensing, radial velocity, and transit surveys have yielded more than 300 planets with masses ranging from a few Earth masses (ME) to 20-30 Jupiter masses (MJ). Observations in the thermal infrared with the IRAS and S ...
Planet Formation
... will be given of what theories exist to explain the formation of planets. Also will be noted were these theories need to be improved, as well as what is missing. Next, the stage after planet formation will be discussed, in which the planetary systems evolve due to interactions among the planets. The ...
... will be given of what theories exist to explain the formation of planets. Also will be noted were these theories need to be improved, as well as what is missing. Next, the stage after planet formation will be discussed, in which the planetary systems evolve due to interactions among the planets. The ...
Molecular Line Emission in Star
... Stars are formed within extended regions of higher density in the interstellar medium. These regions, called molecular clouds, observationally can be traced with carbon monoxide (CO) whereas their dense cores can be traced with ammonia (NH3). The concentration of dust is normally sufficient to block ...
... Stars are formed within extended regions of higher density in the interstellar medium. These regions, called molecular clouds, observationally can be traced with carbon monoxide (CO) whereas their dense cores can be traced with ammonia (NH3). The concentration of dust is normally sufficient to block ...
meteor shower
... stretches along the orbit of the comet Swift-Tuttle. The cloud consists of particles ejected by the comet as it travels on its 130-year orbit. • Most of the dust in the cloud today is around a thousand years old. However, there is also a relatively young filament of dust in the stream that was pulle ...
... stretches along the orbit of the comet Swift-Tuttle. The cloud consists of particles ejected by the comet as it travels on its 130-year orbit. • Most of the dust in the cloud today is around a thousand years old. However, there is also a relatively young filament of dust in the stream that was pulle ...
Chapter 16 Star Birth
... • Elements like carbon and oxygen had not yet been made when the first stars formed • Without CO molecules to provide cooling, the clouds that formed the first stars had to be considerably warmer than today’s molecular clouds • The first stars must therefore have been more massive than most of today ...
... • Elements like carbon and oxygen had not yet been made when the first stars formed • Without CO molecules to provide cooling, the clouds that formed the first stars had to be considerably warmer than today’s molecular clouds • The first stars must therefore have been more massive than most of today ...
Chapter 16 Star Birth Where do stars form? Star
... • Gravity can create stars only if it can overcome the force of thermal pressure in a cloud • Emission lines from molecules in a cloud can prevent a pressure buildup by converting thermal energy into infrared and radio photons ...
... • Gravity can create stars only if it can overcome the force of thermal pressure in a cloud • Emission lines from molecules in a cloud can prevent a pressure buildup by converting thermal energy into infrared and radio photons ...
The HARPS search for southern extra-solar planets
... planet resides in the habitable zone of this low luminosity star. With a radius close to 1.5 R⊕ , the planet is the closest Earth twin to date. The HARPS radial velocities also reveal a longer-period planetary companion of mass 7.7 M⊕ , on a 83.6-d period orbit. Further measurements are planned to c ...
... planet resides in the habitable zone of this low luminosity star. With a radius close to 1.5 R⊕ , the planet is the closest Earth twin to date. The HARPS radial velocities also reveal a longer-period planetary companion of mass 7.7 M⊕ , on a 83.6-d period orbit. Further measurements are planned to c ...
here
... It is far from the Sun (more than 40 times the Earth-Sun distance), hence it receives little sunlight. In turn, we see very little light ...
... It is far from the Sun (more than 40 times the Earth-Sun distance), hence it receives little sunlight. In turn, we see very little light ...
NAM_f2
... searching for planetary transit signals we decided to try such a method in our search. In order to test the effectiveness of such period searching algorithms for this project we initially used synthetic data consisting of white Gaussian noise with a transit signal implanted within it and we varied t ...
... searching for planetary transit signals we decided to try such a method in our search. In order to test the effectiveness of such period searching algorithms for this project we initially used synthetic data consisting of white Gaussian noise with a transit signal implanted within it and we varied t ...
chapter16StarBirth
... Thought Question What would happen to a contracting cloud fragment if it were not able to radiate away its thermal energy? A. It would continue contracting, but its temperature would not change B. Its mass would increase C. Its internal pressure would increase ...
... Thought Question What would happen to a contracting cloud fragment if it were not able to radiate away its thermal energy? A. It would continue contracting, but its temperature would not change B. Its mass would increase C. Its internal pressure would increase ...
Internal structure of a cold dark molecular cloud inferred
... background star ®eld is suf®ciently rich to permit a detailed sampling of the extinction across the entire extent of the cloud. Third, the cloud is suf®ciently nearby that foreground star contamination is negligible. Fourth, Barnard 68 does not appear to harbour any star-formation activity14, making ...
... background star ®eld is suf®ciently rich to permit a detailed sampling of the extinction across the entire extent of the cloud. Third, the cloud is suf®ciently nearby that foreground star contamination is negligible. Fourth, Barnard 68 does not appear to harbour any star-formation activity14, making ...
4P38.pdf
... The results from the “Sun in Time” program suggest that the coronal X-ray-EUV emissions of the young main-sequence Sun were ~100-1000 times stronger than those of the present Sun. Similarly, the transition region and chromospheric FUV-UV emissions of the young Sun are expected to be 20-60 and 10-20 ...
... The results from the “Sun in Time” program suggest that the coronal X-ray-EUV emissions of the young main-sequence Sun were ~100-1000 times stronger than those of the present Sun. Similarly, the transition region and chromospheric FUV-UV emissions of the young Sun are expected to be 20-60 and 10-20 ...
ph507-16-4form
... Stage 4. The high thermal pressure resists gravity and this ends the first collapse, forming what is traditionally called the first core at a density of 1013cm-3 - 1014cm-3 and temperature of 100-200K. Stage 5. A shock wave forms at the outer edge of the first core. The first core accretes from the ...
... Stage 4. The high thermal pressure resists gravity and this ends the first collapse, forming what is traditionally called the first core at a density of 1013cm-3 - 1014cm-3 and temperature of 100-200K. Stage 5. A shock wave forms at the outer edge of the first core. The first core accretes from the ...