Universal redshift, the Hubble constant The cosmic background
... photons scattered for the last time and continue expanding destiny of some of the photons was to be measured by us One can see it easier – since λM ∼ 1/T , TD/TC = LC /LD CMB is the picture of the Universe when it was 2000 (^3) times smaller. ...
... photons scattered for the last time and continue expanding destiny of some of the photons was to be measured by us One can see it easier – since λM ∼ 1/T , TD/TC = LC /LD CMB is the picture of the Universe when it was 2000 (^3) times smaller. ...
The science potential of atmospheric Cherenkov arrays used as intensity interferometers
... Multiple telescopes image the source of optical Cherenkov light created by charged secondary particles (“the shower”) from an incoming gamma-ray. ● The faint Cherenkov light requires large light collectors. ● The brief (~nanosecond) Cherenkov flash requires fast photon detectors. ● Shower image reco ...
... Multiple telescopes image the source of optical Cherenkov light created by charged secondary particles (“the shower”) from an incoming gamma-ray. ● The faint Cherenkov light requires large light collectors. ● The brief (~nanosecond) Cherenkov flash requires fast photon detectors. ● Shower image reco ...
Milky Way I
... molecular hydrogen (densest and coldest), stellar ejecta – Dust – Stars and failed stars (brown dwarfs) – Stellar remnants – black holes, neutron stars, white dwarfs ...
... molecular hydrogen (densest and coldest), stellar ejecta – Dust – Stars and failed stars (brown dwarfs) – Stellar remnants – black holes, neutron stars, white dwarfs ...
Document
... • The flattened shape of a spiral galaxy such as ours implies that it rotates. Our Sun and nearby stars move around the MW with speeds of 220 km/sec and the disk and the MW disk (near us) makes one complete rotation in approx. 240 million years. • What force keeps the galaxy together? – The collecti ...
... • The flattened shape of a spiral galaxy such as ours implies that it rotates. Our Sun and nearby stars move around the MW with speeds of 220 km/sec and the disk and the MW disk (near us) makes one complete rotation in approx. 240 million years. • What force keeps the galaxy together? – The collecti ...
neutron star - Livonia Public Schools
... • Stars less than one-half the mass of the sun never evolve to the red giant stage but remain in the stable main-sequence stage until they consume all their hydrogen fuel and collapse into a white dwarf. ...
... • Stars less than one-half the mass of the sun never evolve to the red giant stage but remain in the stable main-sequence stage until they consume all their hydrogen fuel and collapse into a white dwarf. ...
HIERARCHICAL GALAXY ASSEMBLY AND ITS MANIFESTATIONS
... gas, which turns into stars The formation mechanism is going to be imprinted in the bulge distribution. The distribution of bulge types seem to indicate that secular and classical channels are well separated. ...
... gas, which turns into stars The formation mechanism is going to be imprinted in the bulge distribution. The distribution of bulge types seem to indicate that secular and classical channels are well separated. ...
A Unique Environmental Studies Program
... The Clouds of Magellan. These clouds were first described by the explorer Magellan, and they are actually two satellites of our own Milky Way galaxy. These clouds are easily seen on a clear night, and they lie about 150,000 light years from earth. Close to the Small Mageflanic Cloud you may see what ...
... The Clouds of Magellan. These clouds were first described by the explorer Magellan, and they are actually two satellites of our own Milky Way galaxy. These clouds are easily seen on a clear night, and they lie about 150,000 light years from earth. Close to the Small Mageflanic Cloud you may see what ...
Planet formation - problems and future
... starting evolution of planetary systems. The most of the authors pay attention on interaction between solid bodies (planetesimals) and gas arround existing stars. In many used methods self-gravity is not included in calculations. More interesting for us is the beginning of planet formation from unif ...
... starting evolution of planetary systems. The most of the authors pay attention on interaction between solid bodies (planetesimals) and gas arround existing stars. In many used methods self-gravity is not included in calculations. More interesting for us is the beginning of planet formation from unif ...
Theme 7.2 -- The Complete Solar System
... So, we've discovered planetary systems around many stars but we should be aware of very strong ‘selection effects’ -- that is to say certain biases that are going to influence the kinds of planets we can detect and constrain our ability to draw general conclusions. For example, planets that are big ...
... So, we've discovered planetary systems around many stars but we should be aware of very strong ‘selection effects’ -- that is to say certain biases that are going to influence the kinds of planets we can detect and constrain our ability to draw general conclusions. For example, planets that are big ...
Search for Life in the Universe
... – Earth-size planets are very likely, unless we are unaware of something special in the formation process of our solar system ...
... – Earth-size planets are very likely, unless we are unaware of something special in the formation process of our solar system ...
Volcanoes and Igneous Activity Earth
... Binary Stars and Stellar Mass • A binary star is one of two stars revolving around a common center of mass under their mutual gravitational attraction. • Binary stars are used to determine the star property most difficult to calculate—its mass. ...
... Binary Stars and Stellar Mass • A binary star is one of two stars revolving around a common center of mass under their mutual gravitational attraction. • Binary stars are used to determine the star property most difficult to calculate—its mass. ...
Star and Galaxies
... Binary Stars and Stellar Mass • A binary star is one of two stars revolving around a common center of mass under their mutual gravitational attraction. • Binary stars are used to determine the star property most difficult to calculate—its mass. ...
... Binary Stars and Stellar Mass • A binary star is one of two stars revolving around a common center of mass under their mutual gravitational attraction. • Binary stars are used to determine the star property most difficult to calculate—its mass. ...
Our Galaxy, the Milky Way Galaxy
... There is a super massive black hole at the center of our (and every other) galaxy that is maybe a billion solar masses Only important to find out how the stars near the center of a galaxy rotate We do not know where the black holes came from Black holes do not hold galaxies together and are light co ...
... There is a super massive black hole at the center of our (and every other) galaxy that is maybe a billion solar masses Only important to find out how the stars near the center of a galaxy rotate We do not know where the black holes came from Black holes do not hold galaxies together and are light co ...
Are there Earth-like planets around other stars?
... just need to look for them with other methods. The main difficulty in detecting Earth-like exoplanets around distant stars is that Earth is small (so its light is obscured by the light of the star it orbits) and at the same time in a relatively large orbit (so its star must be observed for a very lo ...
... just need to look for them with other methods. The main difficulty in detecting Earth-like exoplanets around distant stars is that Earth is small (so its light is obscured by the light of the star it orbits) and at the same time in a relatively large orbit (so its star must be observed for a very lo ...
Hubble - STScI
... myriad of stars in our Milky Way Galaxy, he launched a revolution that changed our view of an Earth-centered universe. The launch of NASA’s Hubble Space Telescope aboard the space shuttle Discovery 15 years ago initiated another revolution in astronomy. For the first time, a large telescope that see ...
... myriad of stars in our Milky Way Galaxy, he launched a revolution that changed our view of an Earth-centered universe. The launch of NASA’s Hubble Space Telescope aboard the space shuttle Discovery 15 years ago initiated another revolution in astronomy. For the first time, a large telescope that see ...
AST 301 Fall 2007 Review for Exam 3 This exam covers only
... they are (e.g. did you remember to tell your visitor that most comets spend most of their time very far from the sun? Make sure you imagine being asked why this is so and how we know it—can you give a reasonable answer? Did you mention the “Oort cloud?”) Remember that you don’t have to know anything ...
... they are (e.g. did you remember to tell your visitor that most comets spend most of their time very far from the sun? Make sure you imagine being asked why this is so and how we know it—can you give a reasonable answer? Did you mention the “Oort cloud?”) Remember that you don’t have to know anything ...
KEPLER: Search for Earth-Size Planets in the Habitable Zone
... a minimum of three transits. Because the number of planets expected to be detected depends on the number and characteristics of those assumed for the model calculation, the values shown in Figures 4 and 5 are for illustrative purposes only! The sole purpose of the Kepler Mission is to determine thes ...
... a minimum of three transits. Because the number of planets expected to be detected depends on the number and characteristics of those assumed for the model calculation, the values shown in Figures 4 and 5 are for illustrative purposes only! The sole purpose of the Kepler Mission is to determine thes ...
So What All Is Out There, Anyway?
... see what you were shining the light on. It seems strange, doesn’t it?) The Solar System As you continue to grow you begin to notice some of the other planets of the solar system. The inner planets, Mercury, Venus and Mars, may start coming into view, depending on where they are in their orbits. But ...
... see what you were shining the light on. It seems strange, doesn’t it?) The Solar System As you continue to grow you begin to notice some of the other planets of the solar system. The inner planets, Mercury, Venus and Mars, may start coming into view, depending on where they are in their orbits. But ...
Universe and Star Formation - White Plains Public Schools
... Stellar Evolution Stellar Remnants Black Holes • A black hole is a massive star that has collapsed to such a small volume that its gravity prevents the escape of everything, including light. • Scientists think that as matter is pulled into a black hole, it should become very hot and emit a flood ...
... Stellar Evolution Stellar Remnants Black Holes • A black hole is a massive star that has collapsed to such a small volume that its gravity prevents the escape of everything, including light. • Scientists think that as matter is pulled into a black hole, it should become very hot and emit a flood ...
Lecture - Ann Arbor Earth Science
... Milky Way Galaxy* Where is our Sun and solar system located within the Milky Way galaxy? Scientists believe that our Sun is located about 26000 light years from the center of the Milky Way galaxy. Our Sun is moving at a velocity of about 220 km/s (136 mi/s) around the galaxy, with an orbital period ...
... Milky Way Galaxy* Where is our Sun and solar system located within the Milky Way galaxy? Scientists believe that our Sun is located about 26000 light years from the center of the Milky Way galaxy. Our Sun is moving at a velocity of about 220 km/s (136 mi/s) around the galaxy, with an orbital period ...
Two Summers in the UCSC Science Internship Program
... stars are unusual: Stars are known to form in clusters, so it is rare to find a young, recently formed star in isolation. This anomalous behavior makes field stars an exciting and hotly debated subject. One theory proposes that field stars do, in fact, form by themselves; another claims that field s ...
... stars are unusual: Stars are known to form in clusters, so it is rare to find a young, recently formed star in isolation. This anomalous behavior makes field stars an exciting and hotly debated subject. One theory proposes that field stars do, in fact, form by themselves; another claims that field s ...
A report of the SEEDS Direct Imaging Survey
... □ From SEEDS, 3 direct imaging discovery of planet candidates (GJ 504, Kappa And, GJ 758) and 2 brown dwarfs detection in Pleiades; - GJ 504b is a cold Jovian planet orbiting a relatively old Sun-like star and has unique atmospheric features. □ A few dozens of detections of circumstellar disks, and ...
... □ From SEEDS, 3 direct imaging discovery of planet candidates (GJ 504, Kappa And, GJ 758) and 2 brown dwarfs detection in Pleiades; - GJ 504b is a cold Jovian planet orbiting a relatively old Sun-like star and has unique atmospheric features. □ A few dozens of detections of circumstellar disks, and ...
ASTR2100 - Saint Mary's University | Astronomy & Physics
... In 1837 Argelander, of the Bonn Observatory and orginator of the BD catalogue, was able to derive an apex for the solar motion from studying stellar proper motions. His result is very similar to that recognized today. Also in 1837, Frederick Struve found evidence for interstellar extinction in star ...
... In 1837 Argelander, of the Bonn Observatory and orginator of the BD catalogue, was able to derive an apex for the solar motion from studying stellar proper motions. His result is very similar to that recognized today. Also in 1837, Frederick Struve found evidence for interstellar extinction in star ...
A Telescope as Sharp as Hubble — But On the Ground
... Impressive as AO technology is, this doesn't mean NASA should stop work on the James Webb Space Telescope, the Hubble's successor, which is slated to go into orbit in 2018. The new system sharpens only a small amount of Gemini's field of view, while JWST will have perfect vision across its entire 21 ...
... Impressive as AO technology is, this doesn't mean NASA should stop work on the James Webb Space Telescope, the Hubble's successor, which is slated to go into orbit in 2018. The new system sharpens only a small amount of Gemini's field of view, while JWST will have perfect vision across its entire 21 ...
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.