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September - Rose City Astronomers
September - Rose City Astronomers

... The 600 power telescope, due to its popularity, was remarketed by a number of different companies with their own model numbers. Meade ran continual ads for the small refractor during the 1970s, and labeled it their Model #300 (or #305 for 1 ¼" accessories—they changed the color of the dewcap to whit ...
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Star Formation in Our Galaxy - Wiley-VCH
Star Formation in Our Galaxy - Wiley-VCH

... Molecular Cloud (see Fig. 1.1), but only because it is closer. At a distance of 140 pc, the entire region measures about 30 pc in linear extent. As before, we have labeled some of the main dark clouds, which show up as local peaks in the CO emission; Barnard’s optical image is centered on L1521 and ...
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The Astrobiology Primer

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... consider, for comparison purposes, a porous icy sphere, and then consider a mixture of ice and dust in the form of SiO2 . When their periastron reaches star-grazing values, the FEBs evaporate volatiles and refractory material. These refractory species are actually the ones we observe as spectral var ...
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the next decade - Lowell Observatory

... reconstructions, and the effect of solar variations on terrestrial climate have diversified the literature even further. The connections between the various threads are complex enough that reviewing the field by any one criterion – chronology, method of observation, class of object – does not necess ...
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NSDL/NSTA Web Seminar: Celebrating Astronomy: A Star`s Story

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Stars as thermonuclear reactors: their fuels and ashes

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Department of Physics and Astronomy

... Intended as the second semester of calculus-based college physics for students majoring in science or mathematics. Topics include static electric fields and Coulomb's law, Gauss's law, electric potential, capacitors, Ohm's law, the magnetic field and Ampere's law, induction and Faraday's law, and el ...
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... elements (including the lowest [Fe/H] star yet discovered), and lack of over-abundances of neutron-capture elements (CEMP-no stars) Associated with production by “faint SNe” – progenitors with mass on the order of 10-100 Mo undergoing mixing and fallback, or rapidly rotating mega metal-poor (MMP; [F ...
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Cosmic Evolution - Planetarium Mannheim

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... galactic inflow/outflow, in understanding the factors affecting galaxy evolution. Disentangling the effect of internal (stellar mass) and external (environment) processes on the galaxy evolution is difficult because high mass galaxies tend to exist in dense environments. For the past decade, the dif ...
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supernova remnants: a link between massive stars and the

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... observer’s zenith, which is labeled ZA in the figure. A similar line is drawn for an observer standing at point B, with latitude beta (), pointing to their zenith which is labeled ZB and for an observer at C, with latitude gamma (), whose zenith is labeled ZC. It should be clear that the zenith is ...
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... The effective wavelengths of the filters are determined both by the shape of the incident stellar continuum and the amount of interstellar and atmospheric reddening, which are difficult to model. The redward shift in λeff caused by atmospheric extinction or large reddening is less of a problem for ...
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Riccioli Measures the Stars: Observations of the

... Sirius, complete with diffraction rings (figure 1). If Riccioli is then adjusting his telescope to remove those rings – by restricting its aperture to the point where the rings are no longer detectable – then he is using a procedure that will tend to produce relatively uniform appearance in stars fr ...
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Theoretical astronomy

Theoretical astronomy is the use of the analytical models of physics and chemistry to describe astronomical objects and astronomical phenomena.Ptolemy's Almagest, although a brilliant treatise on theoretical astronomy combined with a practical handbook for computation, nevertheless includes many compromises to reconcile discordant observations. Theoretical astronomy is usually assumed to have begun with Johannes Kepler (1571–1630), and Kepler's laws. It is co-equal with observation. The general history of astronomy deals with the history of the descriptive and theoretical astronomy of the Solar System, from the late sixteenth century to the end of the nineteenth century. The major categories of works on the history of modern astronomy include general histories, national and institutional histories, instrumentation, descriptive astronomy, theoretical astronomy, positional astronomy, and astrophysics. Astronomy was early to adopt computational techniques to model stellar and galactic formation and celestial mechanics. From the point of view of theoretical astronomy, not only must the mathematical expression be reasonably accurate but it should preferably exist in a form which is amenable to further mathematical analysis when used in specific problems. Most of theoretical astronomy uses Newtonian theory of gravitation, considering that the effects of general relativity are weak for most celestial objects. The obvious fact is that theoretical astronomy cannot (and does not try) to predict the position, size and temperature of every star in the heavens. Theoretical astronomy by and large has concentrated upon analyzing the apparently complex but periodic motions of celestial objects.
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