Open Exoplanet Catalogue

Open Exoplanet Catalogue
The Open Exoplanet Catalogue is a catalogue of all discovered extra-solar planets. It is a new kind of astronomical database, based on small text files and a distributed version control system. It is decentralized and completely open. Contribution and corrections are welcome. The Open Exoplanet Catalogue is furthermore the only catalogue that can correctly represent the orbital structure of planets in arbitrary binary, triple and quadruple star systems as well as orphan planets.

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www.cambridgeblog.org: The Universe on a Laptop – Exploring Space with Personal Techonology

www.cambridgeblog.org: The Universe on a Laptop – Exploring Space with Personal Techonology
With the rising power of personal computers, it is now possible to explore models in astrophysics computationally. Models that once were once analyzed purely by hand can be calculated with relative ease, and problems that were difficult to analyze can now be studied by undergraduate students. As an example, consider what is perhaps the simplest model for a star, known as a polytrope. This model treats the star as a gas is in hydrostatic equilibrium, with pressure of the gas balancing the force of gravity. The pressure, temperature, and density of the star as a function of depth can be determined by solving a differential equation known as the Lane-Emden equation. The exact form of the equation depends on the equation of state for the gas, from which one can determine what is known as the polytropic index n. While the Lane-Emden equation looks relatively simple, it only has an analytic solution for a few polytropic indices (n = 0,1,5) none of which are particularly useful for main seq

physics.ucsc.edu: On the possible existence of quark stars (with George Chapline)

physics.ucsc.edu: On the possible existence of quark stars (with George Chapline)
I received my Ph.D. in physics at Cornell under Hans Bethe in 1960. After a year and a half as a fellow at the Princeton Institute for Advanced Studies, I taught and did research in particle physics at Columbia and Stanford before coming in 1966 to the University of California at Santa Cruz. I was a founding member of its Physics Dept. initiating its program of particle and theoretical condensed matter physics. I retired from teaching in 1994 and now I am a Reseach Professor of Physics. My primary research interests have been in particle physics, condensed matter physics, astrophysics, and nonlinear dynamics. I also have had a long standing interest in the history of physics and mathematics, particularly during the 17-century, and I published articles on the works of Hooke, Newton and Huygens, and book reviews in this field. More recently I have written about more contemporary scientist like Poincare, Chandrasekhar and Stoner. I also have been in various activities which have brought