Extrasolar Planets: An Amateur`s Search
... extrasolar planets (Perryman 2000). Other detection methods include positional (astrometric) displacements, gravitational microlensing, and pulsar timing (Perryman 2000). All of these methods are out of reach for the casual astronomer or his equipment; however, professional astronomers today have b ...
... extrasolar planets (Perryman 2000). Other detection methods include positional (astrometric) displacements, gravitational microlensing, and pulsar timing (Perryman 2000). All of these methods are out of reach for the casual astronomer or his equipment; however, professional astronomers today have b ...
Video Lesson Information Astronomy: Observations & Theories Astronomy 1
... This lesson takes students on a journey from planet Earth to the distant galaxies and superclusters. It is illustrated with stunning computer animation and photographs from NASA, the Jet Propulsion Laboratory (JPL), and astronomical observatories. This journey introduces the planets, stars, and gala ...
... This lesson takes students on a journey from planet Earth to the distant galaxies and superclusters. It is illustrated with stunning computer animation and photographs from NASA, the Jet Propulsion Laboratory (JPL), and astronomical observatories. This journey introduces the planets, stars, and gala ...
PARALLAX – IT`S SIMPLE! Abstract
... measure. Even for the nearest star, Alpha Centauri the annual parallax is less than 1 arcsecond (less than 1/3600 of one arc degree). Until recent time the annual parallaxes of only a few hundreds of stars were known. The accuracy of parallax measurements was vastly improved when the European Space ...
... measure. Even for the nearest star, Alpha Centauri the annual parallax is less than 1 arcsecond (less than 1/3600 of one arc degree). Until recent time the annual parallaxes of only a few hundreds of stars were known. The accuracy of parallax measurements was vastly improved when the European Space ...
Jura et al. 2004 - Department of Physics and Astronomy
... estimated to be between 0.02 M⊕ and 0.1 M⊕ (Bernstein et al. 2003; Luu & Jewitt 2002). Typical analogs of the Kuiper Belt may have total masses ≤ 0.1 M⊕ (Jura 2004). Since we observed stars with notable infrared excesses, we probably selected objects with particularly massive systems of parent bodie ...
... estimated to be between 0.02 M⊕ and 0.1 M⊕ (Bernstein et al. 2003; Luu & Jewitt 2002). Typical analogs of the Kuiper Belt may have total masses ≤ 0.1 M⊕ (Jura 2004). Since we observed stars with notable infrared excesses, we probably selected objects with particularly massive systems of parent bodie ...
Chapter 1: Introduction to Galaxies File - QMplus
... Spiral galaxies have much gas within their discs, plus some embedded dust, which amounts to 1-20% of their visible mass (the rest of the visible mass is stars). This gas shows active star formation. The discs contain stars having a range of ages as a result of this continuing star formation. Spiral ...
... Spiral galaxies have much gas within their discs, plus some embedded dust, which amounts to 1-20% of their visible mass (the rest of the visible mass is stars). This gas shows active star formation. The discs contain stars having a range of ages as a result of this continuing star formation. Spiral ...
A radiogenic heating evolution model for cosmochemically Earth
... magnitude as the galactic rotation period in the Sun’s neighborhood, 250 Myr (e.g. Mihalas and Binney, 1981). Thus, within the solar annulus, short-lived nuclides may experience inhomogeneous mixing on the timescale of their half-lives, but the halflives of the long-lived radionuclides of interest ...
... magnitude as the galactic rotation period in the Sun’s neighborhood, 250 Myr (e.g. Mihalas and Binney, 1981). Thus, within the solar annulus, short-lived nuclides may experience inhomogeneous mixing on the timescale of their half-lives, but the halflives of the long-lived radionuclides of interest ...
Designed for portability and ease of use, this
... of shapes and sizes. No matter which astronomical niche you’re interested in, there seems to be a telescope to fit your needs. That is, except for one. What about a telescope for the youngest astronomers? Even the smallest refractors and reflectors are usually too large and too heavy for small-fry s ...
... of shapes and sizes. No matter which astronomical niche you’re interested in, there seems to be a telescope to fit your needs. That is, except for one. What about a telescope for the youngest astronomers? Even the smallest refractors and reflectors are usually too large and too heavy for small-fry s ...
Finnish Centre for Astronomy with ESO
... The stars in local universe galaxy discs can be divided into the thin and the thick disc components according to their vertical light distribution. While we see that the thin discs are still forming, the ubiquitous thick discs seem to be old. Their formation mechanism remains a mystery. Some authors ...
... The stars in local universe galaxy discs can be divided into the thin and the thick disc components according to their vertical light distribution. While we see that the thin discs are still forming, the ubiquitous thick discs seem to be old. Their formation mechanism remains a mystery. Some authors ...
CHP 15
... a. they did not count the brightest stars. b. they did not study the southern sky. c. they did not have large enough telescopes. d. they only observed stars in the disk of the galaxy and not the halo. e. they did not know about interstellar dust clouds. 2. Which of the following is not a characteris ...
... a. they did not count the brightest stars. b. they did not study the southern sky. c. they did not have large enough telescopes. d. they only observed stars in the disk of the galaxy and not the halo. e. they did not know about interstellar dust clouds. 2. Which of the following is not a characteris ...
What is a planet? - X-ray and Observational Astronomy Group
... massive, close-in planets • It is not yet sensitive to planets as small as Earth, even close-in • As orbital period increases, the method becomes insensitive to planets less massive than Jupiter • The length of time that the surveys have been active (since 1989) sets the upper orbital period limit – ...
... massive, close-in planets • It is not yet sensitive to planets as small as Earth, even close-in • As orbital period increases, the method becomes insensitive to planets less massive than Jupiter • The length of time that the surveys have been active (since 1989) sets the upper orbital period limit – ...
Chemical Evolution
... All stellar components of the Milky Way contain very old stars (but where are first stars?) Little evidence for variations in stellar IMF, over wide range of metallicity, age, local density… Small-scale problems with CDM persist, but things are evolving rapidly and the next few years will reall ...
... All stellar components of the Milky Way contain very old stars (but where are first stars?) Little evidence for variations in stellar IMF, over wide range of metallicity, age, local density… Small-scale problems with CDM persist, but things are evolving rapidly and the next few years will reall ...
Survey of Astrophysics A110 The Milky Way Galaxy
... – 3. They are found in the Galactic halo. – 4. Spectral analysis shows that they have a smaller amount of heavy elements than the Sun (hence Pop. II). – 5. They have short main sequences on the HR diagram which indicate that they are old (i.e., they do not contain O, B, A, and F Population II stars) ...
... – 3. They are found in the Galactic halo. – 4. Spectral analysis shows that they have a smaller amount of heavy elements than the Sun (hence Pop. II). – 5. They have short main sequences on the HR diagram which indicate that they are old (i.e., they do not contain O, B, A, and F Population II stars) ...
Sec 30.1 - Highland High School
... It is difficult to tell how big the Milky Way galaxy is, where its center is, or what Earth’s location is within this vast expanse of stars. Though astronomers have answers to these questions, they are still refining their measurements. ...
... It is difficult to tell how big the Milky Way galaxy is, where its center is, or what Earth’s location is within this vast expanse of stars. Though astronomers have answers to these questions, they are still refining their measurements. ...
Stellar Census
... one chooses the sample! Compared to the nearby stars, the Sun is luminous, hot, and big Compared to the apparently bright stars, the Sun is dim, cool, and small Compared to the stars in globular clusters, the Sun is very young Compared to the stars in open (galactic) clusters, the Sun is very old 22 ...
... one chooses the sample! Compared to the nearby stars, the Sun is luminous, hot, and big Compared to the apparently bright stars, the Sun is dim, cool, and small Compared to the stars in globular clusters, the Sun is very young Compared to the stars in open (galactic) clusters, the Sun is very old 22 ...
TELESCOPE
... 9. If the 25mm eyepiece was used with a Dobsonian scope which has a focal length of 1500 mm, what would the magnification be? 10. The ability of a telescope to collect light depends on the area of the objective lens or mirror. A telescope with a 10 inch diameter mirror will gather how may times the ...
... 9. If the 25mm eyepiece was used with a Dobsonian scope which has a focal length of 1500 mm, what would the magnification be? 10. The ability of a telescope to collect light depends on the area of the objective lens or mirror. A telescope with a 10 inch diameter mirror will gather how may times the ...
Vision and Voyages for Planetary Science 2013
... trained his crude telescope on the night sky in January 1610. Prior to this, the Moon and the planets were just lights in the heavens. After Galileo’s observations these lights were revealed as complex worlds in their own right. If Galileo’s observations mark the birth of the scientific study of the ...
... trained his crude telescope on the night sky in January 1610. Prior to this, the Moon and the planets were just lights in the heavens. After Galileo’s observations these lights were revealed as complex worlds in their own right. If Galileo’s observations mark the birth of the scientific study of the ...
Active Galactic Nuclei: are they important?
... Summary – where are we? •AGN are important •Central black hole evolves together in a coupled way with the host galaxy in mutual relation •We start to catch some global energetic effects qualitatively We are still very far from the detailed knowledge of the galaxy evolution which should include BH i ...
... Summary – where are we? •AGN are important •Central black hole evolves together in a coupled way with the host galaxy in mutual relation •We start to catch some global energetic effects qualitatively We are still very far from the detailed knowledge of the galaxy evolution which should include BH i ...
Exploring the physical properties of the first galaxies
... the study of the early Universe allowing us to push to much higher redshift and fainter luminosities. NIRSpec will also allow us to study optical emission lines in galaxies to z~7 (making confirmation possible for many candidates) as well as identifying the presence of Pop-III stars (through HeII em ...
... the study of the early Universe allowing us to push to much higher redshift and fainter luminosities. NIRSpec will also allow us to study optical emission lines in galaxies to z~7 (making confirmation possible for many candidates) as well as identifying the presence of Pop-III stars (through HeII em ...
Westerlund 1 : A Super-Star Cluster within the Milky Way
... sequence from mid-O to late-M stars. In addition, 23 Wolf-Rayet stars are now known. 6 A and F stars have been classified as hypergiants, each having luminosities of the order of 5-8 L - some of the highest observed in the Milky Way. ...
... sequence from mid-O to late-M stars. In addition, 23 Wolf-Rayet stars are now known. 6 A and F stars have been classified as hypergiants, each having luminosities of the order of 5-8 L - some of the highest observed in the Milky Way. ...
The Essential Cosmic Perspective, 6e
... 9) Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years. Answer: FALSE 10) Earth is always precisely 1 AU from the Sun. Answer: FALSE 1.3 Process of Science Questions 1) Light Travel Time: Because of the finite speed of light, we see more distant objects as they were in the ...
... 9) Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years. Answer: FALSE 10) Earth is always precisely 1 AU from the Sun. Answer: FALSE 1.3 Process of Science Questions 1) Light Travel Time: Because of the finite speed of light, we see more distant objects as they were in the ...
Studying the Universe Studying the Universe
... Tycho Brahe In the late-1500s Danish astronomer Tycho Brahe (TIE koh BRAH uh) used several large tools, such as the one illustrated in Figure 4, to study the sky. Tycho favored a theory of an Earthcentered universe that was different from Ptolemaic theory. Tycho believed that the other planets revol ...
... Tycho Brahe In the late-1500s Danish astronomer Tycho Brahe (TIE koh BRAH uh) used several large tools, such as the one illustrated in Figure 4, to study the sky. Tycho favored a theory of an Earthcentered universe that was different from Ptolemaic theory. Tycho believed that the other planets revol ...
Howard 2013 Observed properties of exoplanets
... The planet’s orbital period is the time interval between consecutive transits, and the orbital distance (semi-major axis) can be inferred from Kepler’s third law. The mass of a transiting planet can be measured from follow-up Doppler observations if the host star is bright enough and the Doppler amp ...
... The planet’s orbital period is the time interval between consecutive transits, and the orbital distance (semi-major axis) can be inferred from Kepler’s third law. The mass of a transiting planet can be measured from follow-up Doppler observations if the host star is bright enough and the Doppler amp ...
Stars - gilbertmath.com
... every colour white many different many same all oragne and yellow colour depends on distance from our eye ...
... every colour white many different many same all oragne and yellow colour depends on distance from our eye ...
pierrehumbert_lecture_1
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
... the atmosphere, and heat it to the point where the atmosphere can escape to space. • i.e. it’s the rocket fuel that brings molecules up to escape velocity and can launch atmosphere out of the gravity well. • Shorter wave ultraviolet drives photochemistry, and can break up heavy molecules into lighte ...
Hubble Error: Time, Money and Millionths of an inch
... had only a few days left for the final adjustment: the distance between the lower of the mirrors and the lens. Special rods had been manufactured to measure the spaces. The rods were made of Invar, a material that doesn’t expand or contract in heat or cold. They had been measured and cut, then shipp ...
... had only a few days left for the final adjustment: the distance between the lower of the mirrors and the lens. Special rods had been manufactured to measure the spaces. The rods were made of Invar, a material that doesn’t expand or contract in heat or cold. They had been measured and cut, then shipp ...
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.