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A More Reasonable Comet Recipe Dennis Schatz
... Comet Tempel 1 from Stardust-NeXT Spacecraft Credit: NASA, JPL-Caltech, Cornell 2011 February 16 Explanation: No comet has ever been visited twice before. Therefore, the unprecedented pass of the Stardust-NeXT spacecraft near Comet Tempel 1 earlier this week gave humanity a unique opportunity to se ...
... Comet Tempel 1 from Stardust-NeXT Spacecraft Credit: NASA, JPL-Caltech, Cornell 2011 February 16 Explanation: No comet has ever been visited twice before. Therefore, the unprecedented pass of the Stardust-NeXT spacecraft near Comet Tempel 1 earlier this week gave humanity a unique opportunity to se ...
Chemical analysis of 24 dusty (pre-) main
... we measured to check our analysis with respect to literature results. A first set of observations, concerning mostly the northern-hemisphere objects, was carried out by drs. Hans Van Winckel and Gwendolyn Meeus during the nights of 23 and 25 December 1996, with the William Herschel Telescope and the ...
... we measured to check our analysis with respect to literature results. A first set of observations, concerning mostly the northern-hemisphere objects, was carried out by drs. Hans Van Winckel and Gwendolyn Meeus during the nights of 23 and 25 December 1996, with the William Herschel Telescope and the ...
The Ages of Stars
... the point at which its age begins is ill-defined. Theory might use the point when hydrostatic equilibrium is established, but that is not easy to pinpoint observationally. One baseline that is reasonably well-defined in the observations of premain sequence stars is the deuterium-burning “birthline” ...
... the point at which its age begins is ill-defined. Theory might use the point when hydrostatic equilibrium is established, but that is not easy to pinpoint observationally. One baseline that is reasonably well-defined in the observations of premain sequence stars is the deuterium-burning “birthline” ...
Searching for and Identifying Pulsars
... some very interesting phenomena1 . The most important of these phenomena for us is that radiation is beamed from the magnetic poles of the pulsar. Let’s take a moment to discuss this more fully. If you have ever played with a bar magnet before, you know that magnets have a north and south pole. This ...
... some very interesting phenomena1 . The most important of these phenomena for us is that radiation is beamed from the magnetic poles of the pulsar. Let’s take a moment to discuss this more fully. If you have ever played with a bar magnet before, you know that magnets have a north and south pole. This ...
X-Ray Properties of Young Stars and Stellar Clusters
... Star and planet formation is generally viewed as a hydrodynamic process involving gravitational collapse of interstellar material at low temperatures, 10–100 K in molecular cloud cores and 100–1500 K in protoplanetary disks. If thermodynamical equilibrium holds, this material should be neutral excep ...
... Star and planet formation is generally viewed as a hydrodynamic process involving gravitational collapse of interstellar material at low temperatures, 10–100 K in molecular cloud cores and 100–1500 K in protoplanetary disks. If thermodynamical equilibrium holds, this material should be neutral excep ...
2 Justification and benefits in joining TMT
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
The achromatic design of an atmospheric dispersion corrector for
... (0.59-0.81 µm), I band (0.78-1.02 µm), J band (1.06-1.44 µm), H band (1.5-1.7 µm), and K band (1.96-2.44 µm) at 45 degrees off Zenith. Although the spot size produced at each individual wavelength is smaller than the Airy disk (the black circle), the image of a star in the R band would appear elonga ...
... (0.59-0.81 µm), I band (0.78-1.02 µm), J band (1.06-1.44 µm), H band (1.5-1.7 µm), and K band (1.96-2.44 µm) at 45 degrees off Zenith. Although the spot size produced at each individual wavelength is smaller than the Airy disk (the black circle), the image of a star in the R band would appear elonga ...
Statistical properties of a sample of periodically variable B-type supergiants ⋆
... He I 4471 line. Besides these, we observed one silicon line for each star with the goal to obtain an accurate temperature estimate. Depending on spectral type, this is either the Si II 4130 doublet (late B-type) or the Si III 4560 triplet (early B-type). The spectra were reduced in the standard way, ...
... He I 4471 line. Besides these, we observed one silicon line for each star with the goal to obtain an accurate temperature estimate. Depending on spectral type, this is either the Si II 4130 doublet (late B-type) or the Si III 4560 triplet (early B-type). The spectra were reduced in the standard way, ...
A Determination of the Deflection of Light by the Sun`s Gravitational
... light fro ii a star passing near the sun. (The maximum deflection by Jupiter is only 0" 017.) Evid.ently, the observation must be Spadeduring a total eclipse of the asn. Immediately after EINSTEIN'Sfirst suggestion, the matter was taken up by Dr. E. MFEUNDLICH, who attempted to collect information f ...
... light fro ii a star passing near the sun. (The maximum deflection by Jupiter is only 0" 017.) Evid.ently, the observation must be Spadeduring a total eclipse of the asn. Immediately after EINSTEIN'Sfirst suggestion, the matter was taken up by Dr. E. MFEUNDLICH, who attempted to collect information f ...
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... being developed. This situation is not yet resolved, but progress continues. The NSF process to compete the NRAO management contract resulted in a proposal by Associated Universities, Inc. (AUI) that charts their exciting vision for the Observatory over the next decade. An NSF decision regarding thi ...
... being developed. This situation is not yet resolved, but progress continues. The NSF process to compete the NRAO management contract resulted in a proposal by Associated Universities, Inc. (AUI) that charts their exciting vision for the Observatory over the next decade. An NSF decision regarding thi ...
The presence of gamma rays in space was known before they were
... theorised that gamma rays are produced in space. The first actual gamma rays detected from space were detected by sensors mounted on a high altitude balloon by the scientists Peterson and Winckler in 1958. This was in the same year the first few satellites to have gamma ray detectors were launched. ...
... theorised that gamma rays are produced in space. The first actual gamma rays detected from space were detected by sensors mounted on a high altitude balloon by the scientists Peterson and Winckler in 1958. This was in the same year the first few satellites to have gamma ray detectors were launched. ...
OBTAINING THE PROPERLY WEIGHTED AVERAGE ALBEDO OF
... A look at Figure 1 suggests a cause for these high average albedos. There are a number of data points where the absolute magnitude is several visual magnitudes away from the “albedo = 0.1” line. Those above the line have albedos less than 0.1 and those below the line have albedos greater than 0.1. T ...
... A look at Figure 1 suggests a cause for these high average albedos. There are a number of data points where the absolute magnitude is several visual magnitudes away from the “albedo = 0.1” line. Those above the line have albedos less than 0.1 and those below the line have albedos greater than 0.1. T ...
Gamma-Ray Bursts and Puzzles of Core
... evolution of the blueshifted Hα line were already found (using SYNOW code) in the analysis of a time series of optical spectra for usual CC-SNe with type Ic and Ib (Branch et al., 2001, 2002, Elmhamdi et al., 2006, …). ...
... evolution of the blueshifted Hα line were already found (using SYNOW code) in the analysis of a time series of optical spectra for usual CC-SNe with type Ic and Ib (Branch et al., 2001, 2002, Elmhamdi et al., 2006, …). ...
introduction - University of Arizona
... Antarctic station at Novolazarevskaya, very close to the end of the eclipse path and sunset, is planned, but the Sun will be very close (only a degree) above the horizon and obscuration by blowing snow or white-out conditions is a strong possibility. Until this juncture in time and technology Antarc ...
... Antarctic station at Novolazarevskaya, very close to the end of the eclipse path and sunset, is planned, but the Sun will be very close (only a degree) above the horizon and obscuration by blowing snow or white-out conditions is a strong possibility. Until this juncture in time and technology Antarc ...
ALMA - ESO
... Herschel and ALMA Science: The Cool Universe Herschel is best suited for surveys, ALMA a followup instrument ALMA has a small Field Of View (FOV), but high angular resolution and sensitivity Higher angular resolution to image the sources measured by Herschel Follow up to sources discovered with PAC ...
... Herschel and ALMA Science: The Cool Universe Herschel is best suited for surveys, ALMA a followup instrument ALMA has a small Field Of View (FOV), but high angular resolution and sensitivity Higher angular resolution to image the sources measured by Herschel Follow up to sources discovered with PAC ...
LIDAR MEASUREMENTS
... Remote sensing is defined as the measurement of object properties on the Earth's surface using data acquired from aircraft and satellites. It is therefore an attempt to measure something at a distance, rather than in situation. Since we are not in direct contact with the object of interest, we must ...
... Remote sensing is defined as the measurement of object properties on the Earth's surface using data acquired from aircraft and satellites. It is therefore an attempt to measure something at a distance, rather than in situation. Since we are not in direct contact with the object of interest, we must ...
The Nature of the Stars
... The closer the object you are You measure distances viewing, the greater the parallax shift. To see this, repeat the experiment around you by comparing with your hand held closer to your the images from your face. Your brain analyzes such paral- left and right eyes—we lax shifts constantly as it com ...
... The closer the object you are You measure distances viewing, the greater the parallax shift. To see this, repeat the experiment around you by comparing with your hand held closer to your the images from your face. Your brain analyzes such paral- left and right eyes—we lax shifts constantly as it com ...
Astronomical seeing conditions as determined by turbulence modelling and optical measurement
... Modern space geodetic techniques are required to provide measurements of millimetrelevel accuracy. A new fundamental space geodetic observatory for South Africa has been proposed. It will house state-of-the-art equipment in a location that guarantees optimal scientific output. Lunar Laser Ranging (L ...
... Modern space geodetic techniques are required to provide measurements of millimetrelevel accuracy. A new fundamental space geodetic observatory for South Africa has been proposed. It will house state-of-the-art equipment in a location that guarantees optimal scientific output. Lunar Laser Ranging (L ...
The Cosmos & the Bible
... • View postulates that all stars we see are just multiple images of the few within ten light-years. – Like the multiple images in paired mirrors in clothing stores or amusement parks ...
... • View postulates that all stars we see are just multiple images of the few within ten light-years. – Like the multiple images in paired mirrors in clothing stores or amusement parks ...
Engineering Lightweight Dobsonian Telescopes
... Secondary mirror size is a difficult choice. What you want overall is the smallest secondary you can get away with to catch all the available light from the main mirror, a minimum light obstruction, and adequate eyepiece illumination. The diameter and focal length of the eyepieces you want to use, a ...
... Secondary mirror size is a difficult choice. What you want overall is the smallest secondary you can get away with to catch all the available light from the main mirror, a minimum light obstruction, and adequate eyepiece illumination. The diameter and focal length of the eyepieces you want to use, a ...
The Origin of Comets and the Oort Cloud
... meant that comets became definitely established as celestial objects; but are they solar system or interstellar in origin? ...
... meant that comets became definitely established as celestial objects; but are they solar system or interstellar in origin? ...
Trapezium Fracture
... trapezoidal grouping of stars within the very heart of its structure. Known to astronomers as “the trapezium” because of their relative spatial arrangement, they are very young supermassive giants, each with over 100,000 times the radiant luminosity of our own Sun. They radiate ultraviolet radiation ...
... trapezoidal grouping of stars within the very heart of its structure. Known to astronomers as “the trapezium” because of their relative spatial arrangement, they are very young supermassive giants, each with over 100,000 times the radiant luminosity of our own Sun. They radiate ultraviolet radiation ...
Astronomy Astrophysics - Niels Bohr Institutet
... proper characterisation of their main astrophysical parameters remain seriously incomplete. Moreover, stars have often been selected for observation from criteria which induce correlations between the observed parameters that reflect the characteristics of the selection process more strongly than th ...
... proper characterisation of their main astrophysical parameters remain seriously incomplete. Moreover, stars have often been selected for observation from criteria which induce correlations between the observed parameters that reflect the characteristics of the selection process more strongly than th ...
20_Testbank
... galaxies. Once we determine the distance to another galaxy for which we have observed a whitedwarf supernova, we then can calibrate the average luminosity of white-dwarf supernovae. White-dwarf supernovae and Cepheids get us far enough away from the Milky Way that we then can calibrate Hubble's law ...
... galaxies. Once we determine the distance to another galaxy for which we have observed a whitedwarf supernova, we then can calibrate the average luminosity of white-dwarf supernovae. White-dwarf supernovae and Cepheids get us far enough away from the Milky Way that we then can calibrate Hubble's law ...
International Ultraviolet Explorer
![](https://en.wikipedia.org/wiki/Special:FilePath/International_Ultraviolet_Explorer.gif?width=300)
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.