The Milky Way galaxy
... of about 25 pc. He could then use their angular diameters to get approximate distance for clusters whose stars were too faint to study individually. He discovered that the center of the globular cluster system was situated in Sagittarius at a distance of some 50,000 light years. However, he did not ...
... of about 25 pc. He could then use their angular diameters to get approximate distance for clusters whose stars were too faint to study individually. He discovered that the center of the globular cluster system was situated in Sagittarius at a distance of some 50,000 light years. However, he did not ...
A Giant Planet Around a Metal-poor Star of Extragalactic Origin
... mimic a RV variation caused by an orbiting companion. Instead of measuring the bisectors, one can equivalently use the bisector velocity spans (BVS) to search for rotational modulation (20). Adopting this technique, we have measured BVS from the stellar spectra. There is only a weak correlation betw ...
... mimic a RV variation caused by an orbiting companion. Instead of measuring the bisectors, one can equivalently use the bisector velocity spans (BVS) to search for rotational modulation (20). Adopting this technique, we have measured BVS from the stellar spectra. There is only a weak correlation betw ...
Stars Chapter 21
... • It is a scatter plot • Shows the relationship between absolute brightness and surface temperature • This is the single most important diagram that astronomers use • Uses of H-R Diagram ...
... • It is a scatter plot • Shows the relationship between absolute brightness and surface temperature • This is the single most important diagram that astronomers use • Uses of H-R Diagram ...
Search for Other Worlds - Science fiction 20 years
... 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 influence of the objects will cause the star to move in a tiny circular or elliptical orbit a ...
... 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 influence of the objects will cause the star to move in a tiny circular or elliptical orbit a ...
SPECIAL REPORT
... planets like Earth. So far, astronomers have identified extrasolar planets with inferred masses as low as 5.5 Earths circling around normal stars. But while the pulsar planets are probably composed of rock and metal, the “super-Earths” could be made of ice — a composition closer to that of the ice-g ...
... planets like Earth. So far, astronomers have identified extrasolar planets with inferred masses as low as 5.5 Earths circling around normal stars. But while the pulsar planets are probably composed of rock and metal, the “super-Earths” could be made of ice — a composition closer to that of the ice-g ...
Galaxies, Cosmology and the Accelera`ng Universe
... • Current thinking is that the thick disk stars were originally in the thin disk but were sca?ered • (some recent observa6ons suggest that there is not such a big difference between the thick and ...
... • Current thinking is that the thick disk stars were originally in the thin disk but were sca?ered • (some recent observa6ons suggest that there is not such a big difference between the thick and ...
Lab 5: Searching for Extra-Solar Planets
... 1. With a sketch, show how two of the Balmer absorption lines, at 656 nm and 486 nm, would appear if four equally spaced observations were made in one complete cycle of the star’s motion. (Be sure to show the direction of the observer in your sketch.) 2. By measuring wavelength shifts in the star’s ...
... 1. With a sketch, show how two of the Balmer absorption lines, at 656 nm and 486 nm, would appear if four equally spaced observations were made in one complete cycle of the star’s motion. (Be sure to show the direction of the observer in your sketch.) 2. By measuring wavelength shifts in the star’s ...
Astronomy Final C - Tarleton State University
... 5. Degenerate gases ? cool without losing their pressure. A.can B.cannot 6. ? develop where supernova explosions leave behind a “core” of approximately 1.4 to 2 or 3 stellar masses. A.Brown Dwarfs B.Red Dwarfs C.White Dwarfs D.Neutron Stars E.Black Holes 7. Inertial Mass ? gravitational mass. A.equa ...
... 5. Degenerate gases ? cool without losing their pressure. A.can B.cannot 6. ? develop where supernova explosions leave behind a “core” of approximately 1.4 to 2 or 3 stellar masses. A.Brown Dwarfs B.Red Dwarfs C.White Dwarfs D.Neutron Stars E.Black Holes 7. Inertial Mass ? gravitational mass. A.equa ...
Planetary System Formation, Extrasolar Planets, Life in the Universe
... • First, must find nearby (within 150 lt yrs) terrestrial size planets in the habitable zone. • Find the ones that have atmospheres and establish if they are, indeed, habitable – Determine the temperature at the surface • Target the most promising planets for detailed spectroscopic observations to l ...
... • First, must find nearby (within 150 lt yrs) terrestrial size planets in the habitable zone. • Find the ones that have atmospheres and establish if they are, indeed, habitable – Determine the temperature at the surface • Target the most promising planets for detailed spectroscopic observations to l ...
- Europhysics News
... of exoplanets forces us to reconsider the model of planetary formation currently accepted for the solar system. This model is based upon the properties of planetary orbits, mostly coplanar, circular and concentric around the Sun. Following the early concepts developed by Kant and Laplace in the 18th ...
... of exoplanets forces us to reconsider the model of planetary formation currently accepted for the solar system. This model is based upon the properties of planetary orbits, mostly coplanar, circular and concentric around the Sun. Following the early concepts developed by Kant and Laplace in the 18th ...
Which exoEarths should we search for life
... main sequence lifetimes, at many hundreds of gigayears. However, there are a few problems that may limit the habitability of planets in orbit around them. First, the low luminosity of these stars means that their HZs are very close to the star. Even for the most luminous M dwarfs, the HZ only stretc ...
... main sequence lifetimes, at many hundreds of gigayears. However, there are a few problems that may limit the habitability of planets in orbit around them. First, the low luminosity of these stars means that their HZs are very close to the star. Even for the most luminous M dwarfs, the HZ only stretc ...
New Worlds - Universiteit Leiden
... exoplanet circles 51 Pegasi in just four days! Theoreticians had for decades come up with wonderful explanations why Jupiter is at precisely 5.5 astronomical units from the Sun in our solar system, that is at 5.5 times the distance from the Earth to the Sun (some 5.5 x 825 million km). But now all t ...
... exoplanet circles 51 Pegasi in just four days! Theoreticians had for decades come up with wonderful explanations why Jupiter is at precisely 5.5 astronomical units from the Sun in our solar system, that is at 5.5 times the distance from the Earth to the Sun (some 5.5 x 825 million km). But now all t ...
Slide 1
... the disks of spiral galaxies • B. It was a term used historically to refer to any galaxy • C. It is a cloud of hydrogen gas that we detect by looking at light from quasars • D. It is a cloud of matter that contracts to become a galaxy ...
... the disks of spiral galaxies • B. It was a term used historically to refer to any galaxy • C. It is a cloud of hydrogen gas that we detect by looking at light from quasars • D. It is a cloud of matter that contracts to become a galaxy ...
ph709-09
... follow-up will be possible for some planets as the stellar "wobble" signal is larger for shorter period orbits. However, for transiting planets that are low mass, or that orbit very distant stars, stellar radial velocity measurements may not be possible. For planets at larger orbital distances, radi ...
... follow-up will be possible for some planets as the stellar "wobble" signal is larger for shorter period orbits. However, for transiting planets that are low mass, or that orbit very distant stars, stellar radial velocity measurements may not be possible. For planets at larger orbital distances, radi ...
Lecture 1
... position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider two stars (C and D) that both exhibit parallax. ...
... position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider two stars (C and D) that both exhibit parallax. ...
“Crossroads of Astronomy.” Talk about Five Remarkable
... ionization (different temperatures), not different abundances of elements. She correctly concluded that silicon, carbon, and other common metals seen in the sun were found in about the same relative amounts as on Earth - but the helium and particularly hydrogen were vastly more abundant (by about a ...
... ionization (different temperatures), not different abundances of elements. She correctly concluded that silicon, carbon, and other common metals seen in the sun were found in about the same relative amounts as on Earth - but the helium and particularly hydrogen were vastly more abundant (by about a ...
Slide 1
... Which blows up, and later creates beautiful cloud like shapes called Nebulas. This is an example of a Spiral Galaxy. This is the Galaxy we live in. The “Milky Way” ...
... Which blows up, and later creates beautiful cloud like shapes called Nebulas. This is an example of a Spiral Galaxy. This is the Galaxy we live in. The “Milky Way” ...
Measuring the Stars
... looks quite different: These stars are all more luminous than the Sun. Two new categories appear here—the red giants and the blue giants. Clearly, the brightest stars in the sky appear bright because of their enormous luminosities, not their proximity. ...
... looks quite different: These stars are all more luminous than the Sun. Two new categories appear here—the red giants and the blue giants. Clearly, the brightest stars in the sky appear bright because of their enormous luminosities, not their proximity. ...
April 2006 Newsletter PDF - Cowichan Valley Starfinders Society
... was taken by the Chandra X-Ray observatory. It shows gasses millions of degrees hot rising above the disk of stars and cooler gas. This superheated gas is created by giant stars and supernovae explosions which blow huge bubbles of gas above the disk like smoke rising from chimneys. Shock Wave in Ste ...
... was taken by the Chandra X-Ray observatory. It shows gasses millions of degrees hot rising above the disk of stars and cooler gas. This superheated gas is created by giant stars and supernovae explosions which blow huge bubbles of gas above the disk like smoke rising from chimneys. Shock Wave in Ste ...
26.9 news and views feature mx
... the mass of Mercury, the smallest of the planets known before 1800 and itself less than 6% of the mass of the Earth. This realization, together with the discovery of many minor planets beyond Neptune during the past decade (the largest of which may be bigger than Ceres), has led astronomers to quest ...
... the mass of Mercury, the smallest of the planets known before 1800 and itself less than 6% of the mass of the Earth. This realization, together with the discovery of many minor planets beyond Neptune during the past decade (the largest of which may be bigger than Ceres), has led astronomers to quest ...
Introduction to Galaxies and Cosmology Exercises 2
... b) What is the mass of the black hole if one assume it to radiate at 10% of its Eddinton luminosity? c) What is the Schwarzschild radius of the black hole? 9. (Challenging) A quasar emits two radiating clouds in our general direction at 13/14 the speed of light. They are first observed when they app ...
... b) What is the mass of the black hole if one assume it to radiate at 10% of its Eddinton luminosity? c) What is the Schwarzschild radius of the black hole? 9. (Challenging) A quasar emits two radiating clouds in our general direction at 13/14 the speed of light. They are first observed when they app ...
What do “yellowballs” have to do with the birth of new stars?
... Using a different combination of infrared colors, the yellowballs would not pop out. Ideally, astronomers want to look at as many different colors of light as they can, but the reality is they can not build instruments that do everything. Before building astronomical instruments, scientists need to ...
... Using a different combination of infrared colors, the yellowballs would not pop out. Ideally, astronomers want to look at as many different colors of light as they can, but the reality is they can not build instruments that do everything. Before building astronomical instruments, scientists need to ...
AST1100 Lecture Notes
... From our own solar system, it seems that the total matter is dominated by the Sun, not the planets. The total mass of the planets only make up about one part in 1000 of the total mass of the solar system. If this is the normal ratio, and we have no reason to believe otherwise, then the planets can o ...
... From our own solar system, it seems that the total matter is dominated by the Sun, not the planets. The total mass of the planets only make up about one part in 1000 of the total mass of the solar system. If this is the normal ratio, and we have no reason to believe otherwise, then the planets can o ...
Feb 2015 - Bays Mountain Park
... primary duty involved communications with ground control. At some point during the long, grueling day, a short circuit sparked one of the wires in the capsule. This spark eventually led to a raging fire in the 100% high pressure oxygen conditions in the spacecraft. In less than a minute, the men wer ...
... primary duty involved communications with ground control. At some point during the long, grueling day, a short circuit sparked one of the wires in the capsule. This spark eventually led to a raging fire in the 100% high pressure oxygen conditions in the spacecraft. In less than a minute, the men wer ...
The Milky Way - TCNJ | The College of New Jersey
... • Some of these are compressed enough to form bright O-B STAR CLUSTERS, which can in turn ionize and light up parts of the clouds into H II regions. • Stars older than about 20-30 Myr are usually outside the arms. • NOTE: the arms are barely denser in stars than the rest of the disk but they stand o ...
... • Some of these are compressed enough to form bright O-B STAR CLUSTERS, which can in turn ionize and light up parts of the clouds into H II regions. • Stars older than about 20-30 Myr are usually outside the arms. • NOTE: the arms are barely denser in stars than the rest of the disk but they stand o ...
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.