E:\2012-2013\SSU\PHS 207spring 2013\3rd test 4
... Why does the average chemical composition of stars now forming differ from that of older stars? The younger stars contain heavier elements created in massive stars and gathered from the supernovae of those stars. The older stars were created before the supernovae released the heavier elements. ...
... Why does the average chemical composition of stars now forming differ from that of older stars? The younger stars contain heavier elements created in massive stars and gathered from the supernovae of those stars. The older stars were created before the supernovae released the heavier elements. ...
"Earth" among 7 distant planets
... She also said scientists only have ideas about what makes a planet livable. They cannot test their ideas. The only planet they know with life on it is Earth. They do not know what life would really be like on other planets. Even if the planets do not have life, they are a good way for scientists to ...
... She also said scientists only have ideas about what makes a planet livable. They cannot test their ideas. The only planet they know with life on it is Earth. They do not know what life would really be like on other planets. Even if the planets do not have life, they are a good way for scientists to ...
Other Solar Systems Around Other Stars
... Doppler method tells you the MASS of the planet and DISTANCE from star Only transits can give you the size, density of exoplanets Direct imaging – very tough; only a handful Absorption lines from bright star transits may tell us atmospheric chemistry Infrared light variations during orbit can tell u ...
... Doppler method tells you the MASS of the planet and DISTANCE from star Only transits can give you the size, density of exoplanets Direct imaging – very tough; only a handful Absorption lines from bright star transits may tell us atmospheric chemistry Infrared light variations during orbit can tell u ...
Exoplanet, 51 Pegasi b, Solar System, VLT, La Silla. ESOcast
... richest planetary system yet. The system, located over 120 light-years away around the Sun-like star HD 10180, contains at least five exoplanets. There is also tantalising evidence that two more planets may be present in this system, one of which would have the lowest mass ever found. ...
... richest planetary system yet. The system, located over 120 light-years away around the Sun-like star HD 10180, contains at least five exoplanets. There is also tantalising evidence that two more planets may be present in this system, one of which would have the lowest mass ever found. ...
script
... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
Evan_Skillman_1
... cores are no longer on the main sequence. • All stars become larger and redder after exhausting their core hydrogen: giants and ...
... cores are no longer on the main sequence. • All stars become larger and redder after exhausting their core hydrogen: giants and ...
Webb Space Telescope’s mirror are mounted for testing in an ultracold
... All this involves unprecedented technical risks. Because of the telescope’s remote perch, no astronaut will be able to fix it if something goes wrong. Unlike with the Hubble, which has had several repairs and upgrades throughout the two decades it has been in operation, there will be no do-overs, no ...
... All this involves unprecedented technical risks. Because of the telescope’s remote perch, no astronaut will be able to fix it if something goes wrong. Unlike with the Hubble, which has had several repairs and upgrades throughout the two decades it has been in operation, there will be no do-overs, no ...
Mapping the Stars
... (Hertzsprung) and American astronomer (Henry Norris Russell) on the brightness and temperature of stars resulted in a graph called what? • H-R diagram • What does the diagram show? • It shows the relationship between a star’s surface temperature and its absolute magnitude (brightness). • On the H- R ...
... (Hertzsprung) and American astronomer (Henry Norris Russell) on the brightness and temperature of stars resulted in a graph called what? • H-R diagram • What does the diagram show? • It shows the relationship between a star’s surface temperature and its absolute magnitude (brightness). • On the H- R ...
General Astronomy - Stockton University
... At this point in time, the ‘jury is still out’ and we really don’t know if Barnard’s Star was the first discovery of extra-solar planets. ...
... At this point in time, the ‘jury is still out’ and we really don’t know if Barnard’s Star was the first discovery of extra-solar planets. ...
Page pour l`impression
... In Neptune's rings, the edge of the Adams ring is in a resonance 42:43 with the satellite Galatea. Resonances between the rotation motion of a body and its revolution motion are also possible. When the orbits are eccentric and/or inclined, other "velocities" can appear. The mutual perturbations betw ...
... In Neptune's rings, the edge of the Adams ring is in a resonance 42:43 with the satellite Galatea. Resonances between the rotation motion of a body and its revolution motion are also possible. When the orbits are eccentric and/or inclined, other "velocities" can appear. The mutual perturbations betw ...
Dark Matter - UW - Laramie, Wyoming | University of Wyoming
... • As yet, not detected (axions are predicted to change to and from photons in the presence of strong magnetic fields, and this property is used for creating experiments to detect axions) ...
... • As yet, not detected (axions are predicted to change to and from photons in the presence of strong magnetic fields, and this property is used for creating experiments to detect axions) ...
Our Solar System
... • A specific planetary system around our star • The region of space that falls within the gravitational influence of our Sun • If you consider the edge of the Solar System to be Pluto’s orbit, the Solar System has a diameter of ...
... • A specific planetary system around our star • The region of space that falls within the gravitational influence of our Sun • If you consider the edge of the Solar System to be Pluto’s orbit, the Solar System has a diameter of ...
binary star
... Death of Medium-Mass Stars • Stars with masses similar to the sun evolve in essentially the same way as low-mass stars. • During their collapse from red giants to white dwarfs, medium-mass stars are thought to cast off their bloated outer layer, creating an expanding round cloud of gas called plan ...
... Death of Medium-Mass Stars • Stars with masses similar to the sun evolve in essentially the same way as low-mass stars. • During their collapse from red giants to white dwarfs, medium-mass stars are thought to cast off their bloated outer layer, creating an expanding round cloud of gas called plan ...
lecture25
... Stars form from dense gas in molecular clouds Stars age and then give up their outer layers (via solar wind, planetary nebula, or supernova) The ejected gas eventually finds its way back into an overly dense region and become part of the next generation of stars. This process is repeated as long as ...
... Stars form from dense gas in molecular clouds Stars age and then give up their outer layers (via solar wind, planetary nebula, or supernova) The ejected gas eventually finds its way back into an overly dense region and become part of the next generation of stars. This process is repeated as long as ...
The Solar System (Ch. 6 in text) Consists of the sun (a typical star
... the distance from the planet to the star (in angular separation) is so small that we can’t resolve any planets if they are there. It may be possible to directly detect giant planets around very faint stars, but certainly not terrestrial-like planets. ...
... the distance from the planet to the star (in angular separation) is so small that we can’t resolve any planets if they are there. It may be possible to directly detect giant planets around very faint stars, but certainly not terrestrial-like planets. ...
The Search for Worlds Like Our Own
... for detailed study and possible implementation. This is commonly referred to as the Darwin mission study (Fridlund, 2000), which uses the new technology of nulling (or destructive on-axis) interferometry (Bracewell, 1978; Bracewell and MacPhie, 1979). For the Darwin study, the spectral region betwee ...
... for detailed study and possible implementation. This is commonly referred to as the Darwin mission study (Fridlund, 2000), which uses the new technology of nulling (or destructive on-axis) interferometry (Bracewell, 1978; Bracewell and MacPhie, 1979). For the Darwin study, the spectral region betwee ...
Paper - Astrophysics - University of Oxford
... properties then can be used to determine the albedos (reflectivities), and thereby the surface temperatures on detected planets. For large gas giants, rings like those around Saturn would reveal themselves as changes in the phase light curve of a planet (Fig. 1). On different timescales, the influen ...
... properties then can be used to determine the albedos (reflectivities), and thereby the surface temperatures on detected planets. For large gas giants, rings like those around Saturn would reveal themselves as changes in the phase light curve of a planet (Fig. 1). On different timescales, the influen ...
The Solar System (Ch. 6 in text) The solar system consists of the Sun
... the distance from the planet to the star (in angular separation) is so small that we can’t resolve any planets if they are there. It may be possible to directly detect giant planets around very faint stars, but certainly not terrestrial-like planets. ...
... the distance from the planet to the star (in angular separation) is so small that we can’t resolve any planets if they are there. It may be possible to directly detect giant planets around very faint stars, but certainly not terrestrial-like planets. ...
An Earth-sized Planet in the Habitable Zone of a
... out, the planet was likely vulnerable to photo-evaporation early in the star’s life when extreme ultra-violet (XUV) flux from the star was significantly higher. Hence any H/He envelope that was accreted would likely have been stripped via hydrodynamic mass loss (23). Although Kepler-186f likely does ...
... out, the planet was likely vulnerable to photo-evaporation early in the star’s life when extreme ultra-violet (XUV) flux from the star was significantly higher. Hence any H/He envelope that was accreted would likely have been stripped via hydrodynamic mass loss (23). Although Kepler-186f likely does ...
AST301.Ch6.15.SolarSystems - University of Texas Astronomy
... the distance from the planet to the star (in angular separation) is so small that we can’t resolve any planets if they are there. It may be possible to directly detect giant planets around very faint stars, but certainly not terrestrial-like planets. ...
... the distance from the planet to the star (in angular separation) is so small that we can’t resolve any planets if they are there. It may be possible to directly detect giant planets around very faint stars, but certainly not terrestrial-like planets. ...
What is a planet?
... This is a big problem for the nebular hypothesis. How to fix it: – minimum solar nebula is only a minimum – consider only formation of giant planets at large radii, where temperature is lower ...
... This is a big problem for the nebular hypothesis. How to fix it: – minimum solar nebula is only a minimum – consider only formation of giant planets at large radii, where temperature is lower ...
Observational Constraints The Nebular Hypothesis
... 2. The mass of the giant planets decreases with orbital distance. 3. Heavy element enrichment increases with decreasing mass. Outside of the Solar System: 1. While there are many observed extrasolar giant planets, they still appear to be less common than small (terrestrial) planets. An up-to-date ca ...
... 2. The mass of the giant planets decreases with orbital distance. 3. Heavy element enrichment increases with decreasing mass. Outside of the Solar System: 1. While there are many observed extrasolar giant planets, they still appear to be less common than small (terrestrial) planets. An up-to-date ca ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
... Since distance α 1 / parallax, Spica must be at twice the distance of Canopus. (The numbers are 100 pc and 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the ma ...
... Since distance α 1 / parallax, Spica must be at twice the distance of Canopus. (The numbers are 100 pc and 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the ma ...
The Stars - University of Redlands
... the Big Dipper. It was the first binary star system to be imaged with a telescope. Spectroscopic observations show periodic Doppler shifts in the spectra of Mizar A and B, indicating that they are each binary stars. But they were too close to be directly imaged - until 2 May 1996, when the NPOI prod ...
... the Big Dipper. It was the first binary star system to be imaged with a telescope. Spectroscopic observations show periodic Doppler shifts in the spectra of Mizar A and B, indicating that they are each binary stars. But they were too close to be directly imaged - until 2 May 1996, when the NPOI prod ...
Handout from Allaire Star Party
... known as planetary nebulae (even though these have nothing to do with planets); the white dwarf is visible at the center of some planetary nebulae. One of the best known planetary nebulae is the Ring Nebula in the constellation Lyra. The Ring Nebula is 57 light years from the Earth and is similar to ...
... known as planetary nebulae (even though these have nothing to do with planets); the white dwarf is visible at the center of some planetary nebulae. One of the best known planetary nebulae is the Ring Nebula in the constellation Lyra. The Ring Nebula is 57 light years from the Earth and is similar to ...
Space Interferometry Mission
The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope developed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman. One of the main goals of the mission was the hunt for Earth-sized planets orbiting in the habitable zones of nearby stars other than the Sun. SIM was postponed several times and finally cancelled in 2010.In addition to hunting for extrasolar planets, SIM would have helped astronomers construct a map of the Milky Way galaxy. Other important tasks would have included collecting data to help pinpoint stellar masses for specific types of stars, assisting in the determination of the spatial distribution of dark matter in the Milky Way and in the Local Group of galaxies and using the gravitational microlensing effect to measure the mass of stars.The spacecraft would have used optical interferometry to accomplish these and other scientific goals. This technique collects light with multiple mirrors (in SIM's case, two) which is combined to make an interference pattern which can be very precisely measured.The initial contracts for SIM Lite were awarded in 1998, totaling US$200 million. Work on the SIM project required scientists and engineers to move through eight specific new technology milestones, and by November 2006, all eight had been completed.SIM Lite was originally scheduled for a 2005 launch, aboard an Evolved Expendable Launch Vehicle (EELV). As a result of continued budget cuts, the launch date has been pushed back at least five times. NASA has set a preliminary launch date for 2015 and U.S. federal budget documents confirm that a launch date is expected ""no earlier"" than 2015. The budget cuts to SIM Lite are expected to continue through FY 2010. As of February 2007, many of the engineers working on the SIM program had moved on to other areas and projects, and NASA directed the project to allocate its resources toward engineering risk reduction. However, the preliminary budget for NASA for 2008 included zero dollars for SIM.In December 2007, the Congress restored funding for fiscal year 2008 as part of an omnibus appropriations bill which the President later signed. At the same time the Congress directed NASA to move the mission forward to the development phase. In 2009 the project continued its risk reduction work while waiting for the findings and recommendations of the Astronomy and Astrophysics Decadal Survey, Astro2010, performed by the National Academy of Sciences, which would determine the project's future.On 13 August 2010, the Astro2010 Decadal Report was released and did not recommend that NASA continue the development of the SIM Lite Astrometric Observatory. This prompted NASA Astronomy and Physics Director, Jon Morse, to issue a letter on 24 September 2010 to the SIM Lite project manager, informing him that NASA was discontinuing its sponsorship of the SIM Lite mission and directing the project to discontinue Phase B activities immediately or as soon as practical. Accordingly, all SIM Lite activities were closed down by the end of calendar year 2010.