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Rotating Stars and Revolving Planets: Bayesian Exploration of the
Rotating Stars and Revolving Planets: Bayesian Exploration of the

... astronomy: studies of pulsars (rapidly rotating neutron stars) and of extrasolar planets (“exoplanets,” planetary bodies revolving around other suns). New and upcoming instrumentation are producing rich data sets and challenging statistical inference problems in both pulsar and exoplanet astronomy. ...
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... to know how were they formed, why they had so many colors, why they were called planetary nebulae, the significance of their names, their composition, how many possibly existed in the Milky Way galaxy, their approximate age, their first discovery and the aftermath of their eventual death. To address ...
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... typical brightness of our occultation stars that we were observing anyway. We are about to submit a paper to the Astronomical Journal about our results. It is important to search in the Pluto system ahead of and behind Pluto itself, since the New Horizons spacecraft's radio signals are so weak that ...
Shouting in the Jungle: the SETI Transmission Debate
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... greater than this]. The pc is defined as the distance at which an object displays a parallax of 1 second of arc across a baseline of 1 astronomical unit (which is, of course, the radius of the Earth’s orbit). By symmetry, the Earth, as viewed from that star, will thus appear to be separated from the ...
White Paper on Nuclear Astrophysics
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... nuclei over millions of years, others use extremely unstable nuclei as stepping stones to build up new elements within seconds. For some of these reaction sequences experiments have provided data on reaction rates that allow to predict what elements they may have created. For most however, nuclear p ...
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... The recycling of stellar material has another, even more important, connection to our own existence. By studying stars of different ages, we have learned that the early universe contained only the simplest chemical elements: hydrogen and helium (and a trace amount of lithium). We and Earth are made ...
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... Dust exists everywhere—in inter- and circum-planetary, inter- and circum-stellar, and even intergalactic, space—since its first creation in the Universe. The first generation of cosmic dust must have been produced less than 1 Gyr after the Big Bang, for the reason that more than 108 solar masses of ...
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... Red supergiants and red giants share the same physical characteristics and properties, with size and luminosity the only major difference between them. To understand this size difference we use our sun as a reference point. Red giants have solar radii up to 10 to 100 times larger than our sun, while ...
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2016 Annual Report - International Dark

... gets their chance to survey the sites in their fullest physical context. As with many areas of research there have been a variety of people and institutions offering their methods and conclusions. Often disagreements abound. It is not the purpose of this booklet to favor one researcher over any of t ...
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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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