Class 28 (Jun 2) - Physics at Oregon State University
... Missing Mass • We can calculate the mass of the Milky Way by measuring the orbital velocities of dwarf galaxies in orbit around our galaxy. • We can also count the number of stars in the galaxy, and estimate the galactic mass. The two numbers do not agree. By a factor of 10! • Rotation curves do no ...
... Missing Mass • We can calculate the mass of the Milky Way by measuring the orbital velocities of dwarf galaxies in orbit around our galaxy. • We can also count the number of stars in the galaxy, and estimate the galactic mass. The two numbers do not agree. By a factor of 10! • Rotation curves do no ...
Unit 1
... We can also count the number of stars in the galaxy, and estimate the galactic mass. The two numbers do not agree! Rotation curves do not show the expected decrease in stars’ orbital velocities with distance from the galactic center, so there must be much more mass present in our galaxy Astronomers ...
... We can also count the number of stars in the galaxy, and estimate the galactic mass. The two numbers do not agree! Rotation curves do not show the expected decrease in stars’ orbital velocities with distance from the galactic center, so there must be much more mass present in our galaxy Astronomers ...
HABITABLE PLANETS For every star with planets, how many of
... and we should be searching for signals from them. Also, they have very long main sequence lifetimes, so you could have civilizations as old as 1015 billion years on planets orbiting these stars. Conclusion: avg. number of habitable planets per star ~ 0.01--0.5, with huge uncertainty (mostly due to u ...
... and we should be searching for signals from them. Also, they have very long main sequence lifetimes, so you could have civilizations as old as 1015 billion years on planets orbiting these stars. Conclusion: avg. number of habitable planets per star ~ 0.01--0.5, with huge uncertainty (mostly due to u ...
September 3 and 5 slides
... Curtis noted that many of the spirals had dark, thick bands of obscuring material and gave 3 big “ifs”: (1) if the MW has such a band, (2) if we are located in the mid-plane of the band, and (3) if the spirals are located outside the MW, then the Zone of Avoidance is caused by the obscuring material ...
... Curtis noted that many of the spirals had dark, thick bands of obscuring material and gave 3 big “ifs”: (1) if the MW has such a band, (2) if we are located in the mid-plane of the band, and (3) if the spirals are located outside the MW, then the Zone of Avoidance is caused by the obscuring material ...
γ The potential for intensity interferometry with -ray telescope arrays
... Michelson interferometers such as Ohana [10] which operate in the K band. Limiting mv of a CTA concept is illustrated in the right panel of Fig. 1. Targets are limited to a mv ≈ 8.5m for a S/N = 5, and a 5 hours integration in case of 50% visibility (see Le Bohec et al., these proceedings). These sp ...
... Michelson interferometers such as Ohana [10] which operate in the K band. Limiting mv of a CTA concept is illustrated in the right panel of Fig. 1. Targets are limited to a mv ≈ 8.5m for a S/N = 5, and a 5 hours integration in case of 50% visibility (see Le Bohec et al., these proceedings). These sp ...
Study Island
... 10. There are eight planets in the solar system. Each planet is different from the others, but they all share some common characteristics. Which of the following is a similarity of all planets? A. All planets have organisms on them. B. All planets orbit a star. C. All planets have liquid water. D. A ...
... 10. There are eight planets in the solar system. Each planet is different from the others, but they all share some common characteristics. Which of the following is a similarity of all planets? A. All planets have organisms on them. B. All planets orbit a star. C. All planets have liquid water. D. A ...
Astronomy_Stars_n_Galaxies_PowerPoint
... • In the 1920’s, American astronomer Edwin Hubble discovered that the light given off by a star or galaxy gets “stretched” if it is moving away from us. This causes the light being given off to have a longer wavelength and the object to appear redder than it really is. This is called the red shift. ...
... • In the 1920’s, American astronomer Edwin Hubble discovered that the light given off by a star or galaxy gets “stretched” if it is moving away from us. This causes the light being given off to have a longer wavelength and the object to appear redder than it really is. This is called the red shift. ...
Infinity Express
... MS-ESS1- Analyze and interpret data to determine scale properties of objects in the solar ...
... MS-ESS1- Analyze and interpret data to determine scale properties of objects in the solar ...
Passport to the Universe Educator`s Guide Text
... your students well beyond the two-dimensional view of the night sky. Your students will take a virtual voyage through the three-dimensional universe and come to understand, in a way never before possible, the astronomical meaning of space and scale. Museum scientists have taken data from the Hubble ...
... your students well beyond the two-dimensional view of the night sky. Your students will take a virtual voyage through the three-dimensional universe and come to understand, in a way never before possible, the astronomical meaning of space and scale. Museum scientists have taken data from the Hubble ...
globular clusters - Jeremiah Horrocks Institute
... The Moses Holden Telescope at Alston Observatory is still in the process of being commissioned, but it has already been used to image some deep-sky objects, such as nebulae, globular clusters and distant galaxies. The telescope has a very large collecting area, which allows it to detect these faint ...
... The Moses Holden Telescope at Alston Observatory is still in the process of being commissioned, but it has already been used to image some deep-sky objects, such as nebulae, globular clusters and distant galaxies. The telescope has a very large collecting area, which allows it to detect these faint ...
How Big Is Our Universe? - Harvard
... stars and galaxies formed. The bright patterns show clumps of simple matter that will eventually form stars and galaxies. Although this light fills the entire night sky, it is so faint and has so little energy that it is detectable only with special instruments. This colorized image was taken by NAS ...
... stars and galaxies formed. The bright patterns show clumps of simple matter that will eventually form stars and galaxies. Although this light fills the entire night sky, it is so faint and has so little energy that it is detectable only with special instruments. This colorized image was taken by NAS ...
Sample final exam
... to be. To help with your classification, this galaxy emits more radiation, from gamma rays to radio waves, than the Milky Way does. Explain why this type of galaxy would be expected to emit such extra radiation. 24. Below are some characteristics of stars. Your task is to separate them into two cate ...
... to be. To help with your classification, this galaxy emits more radiation, from gamma rays to radio waves, than the Milky Way does. Explain why this type of galaxy would be expected to emit such extra radiation. 24. Below are some characteristics of stars. Your task is to separate them into two cate ...
Planet formation
... • The Gases gather around a large asteroid in space by gravity and slowly start to grow more dense. • The rock becomes the center of the planet as the gases keep surrounding it. • As the planet grows bigger, its gravitational pull increases, dragging in more gasses. • Since Gaseous planets are farth ...
... • The Gases gather around a large asteroid in space by gravity and slowly start to grow more dense. • The rock becomes the center of the planet as the gases keep surrounding it. • As the planet grows bigger, its gravitational pull increases, dragging in more gasses. • Since Gaseous planets are farth ...
Cepheid Variables and the Faulkes Telescope
... programs for Australian schools. The Australian telescope is due for completion in early 2004. How far away are the stars? This question has long been the focus of astronomical research. Early civilisations built pyramids to climb so that they could be closer to the stars to make better observations ...
... programs for Australian schools. The Australian telescope is due for completion in early 2004. How far away are the stars? This question has long been the focus of astronomical research. Early civilisations built pyramids to climb so that they could be closer to the stars to make better observations ...
The Milky Way Galaxy
... To determine the rotation curve of the Galaxy, we will introduce a more convenient coordinate system, called the Galactic coordinate system. Note that the plane of the solar system is not the same as the plane of the Milky Way disk, and the Earth itself is tipped with respect to the plane of the sol ...
... To determine the rotation curve of the Galaxy, we will introduce a more convenient coordinate system, called the Galactic coordinate system. Note that the plane of the solar system is not the same as the plane of the Milky Way disk, and the Earth itself is tipped with respect to the plane of the sol ...
Stars and Galaxies – Notes
... Many stars are found in multiple-star systems. Alpha Centauri is in a multiple star system. It is made up of three stars called a triple star system. Over half of the stars in the sky have at least one companion star. Most of these stars are doublestar systems in which two stars revolve around each ...
... Many stars are found in multiple-star systems. Alpha Centauri is in a multiple star system. It is made up of three stars called a triple star system. Over half of the stars in the sky have at least one companion star. Most of these stars are doublestar systems in which two stars revolve around each ...
Perimeter Dark Matter Online Game Worksheet #1 1. Match the
... 7. What changes if you add dark matter to a galaxy? a. Mass b. Brightness c. Both mass and brightness d. Neither mass or brightness 8. The mass difference between theory and observation can’t be stars or other luminous objects because: a. If the mass difference was stars, the mass would be too great ...
... 7. What changes if you add dark matter to a galaxy? a. Mass b. Brightness c. Both mass and brightness d. Neither mass or brightness 8. The mass difference between theory and observation can’t be stars or other luminous objects because: a. If the mass difference was stars, the mass would be too great ...
Science 9 Unit 5: Space Name - Science 9
... Bigger telescopes enable astronomers to discover new bodies in space. Sir William Herschel built a huge reflecting telescope and discovered the planet Uranus with it in 1773. The largest refracting telescope was built at the Yerkes Observatory near the end of the nineteenth century. With it, Gerald ...
... Bigger telescopes enable astronomers to discover new bodies in space. Sir William Herschel built a huge reflecting telescope and discovered the planet Uranus with it in 1773. The largest refracting telescope was built at the Yerkes Observatory near the end of the nineteenth century. With it, Gerald ...
70 Thousand Million, Million, Million Stars in Space
... These contain millions of galaxies and can measure hundreds of millions of light-years across. ...
... These contain millions of galaxies and can measure hundreds of millions of light-years across. ...
Prime Focus - Tri-City Astronomy Club
... Observatory, two teams of astronomers have now found that the system consists of a Uranus-sized planet orbiting about 370 million miles from its parent star, slightly less than the distance between Jupiter and the sun. The host star, however, is about 70 percent as massive as our sun. "These chance ...
... Observatory, two teams of astronomers have now found that the system consists of a Uranus-sized planet orbiting about 370 million miles from its parent star, slightly less than the distance between Jupiter and the sun. The host star, however, is about 70 percent as massive as our sun. "These chance ...
Issue 122 - Aug 2014
... Only, that's not quite right. Depending on how thick the Earth's crust is, whether you're slightly closer to or farther from the Earth's center, or what the density of the material beneath you is, you'll experience slight variations in Earth's gravity as large as 0.2%, something you'd need to accoun ...
... Only, that's not quite right. Depending on how thick the Earth's crust is, whether you're slightly closer to or farther from the Earth's center, or what the density of the material beneath you is, you'll experience slight variations in Earth's gravity as large as 0.2%, something you'd need to accoun ...
Skillen HARPS-NEF - University of Hertfordshire
... characterise Earth-like planets from candidates identified by NASA's Kepler mission, launched on 6th March this year. It will incorporate several improvements on the original HARPS spectrograph at the European Southern Observatory in Chile, most notably the use of a laser frequency grid or 'astro co ...
... characterise Earth-like planets from candidates identified by NASA's Kepler mission, launched on 6th March this year. It will incorporate several improvements on the original HARPS spectrograph at the European Southern Observatory in Chile, most notably the use of a laser frequency grid or 'astro co ...
Day-26
... Concept Quiz Hot Protostars We know that stars have different temperatures. Consider a newly forming star that was much hotter than the protoSun. What would we expect about its planets? A. The planets orbit at random angles around the star. B. Rocky planets might be formed over a wider range of dis ...
... Concept Quiz Hot Protostars We know that stars have different temperatures. Consider a newly forming star that was much hotter than the protoSun. What would we expect about its planets? A. The planets orbit at random angles around the star. B. Rocky planets might be formed over a wider range of dis ...
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.