Cosmo-torun April 2003

cosmo-torun@cosmo.torun.pl

1 participants
2 discussions

The Extragalactic Distance Scale
by Andrzej Marecki 28 Apr '03

28 Apr '03

Paper: astro-ph/0304427 From: Joseph B. Jensen <jjensen(a)gemini.edu> Date: Wed, 23 Apr 2003 23:52:07 GMT (67kb) Title: The Extragalactic Distance Scale Authors: Joseph B. Jensen (Gemini), John L. Tonry (Hawaii), John P. Blakeslee (JHU) Comments: 18 pages, 1 figure; contribution to Measuring and Modeling the Universe, Carnegie Observatories Astrophysics Series Vol. 2, ed. W. L. Freedman \\ Significant progress has been made during the last 10 years toward resolving the debate over the expansion rate of the Universe. [...] We discuss remaining systematic uncertainties, particularly related to the Cepheid calibration, and identify where improvements are likely to be made in the next few years. \\ ( http://de.arXiv.org/abs/astro-ph/0304427 , 67kb) ------------------------------------------------------------------------------ [...] ----- End of forwarded message from astro-ph -----

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"projective sphere" (fwd)
by boud 01 Apr '03

01 Apr '03

hi, i received this from a friend. The projective sphere is the 2-sphere S^2 where each point is identified with its opposite point. So the fundamental polygon is a hemisphere. Geodesics only intersect once in the projective sphere. > Hi Boud, > what an irony, but I am looking for your help with Polish !!! > Could you or your collaborators on topology in Torun > enlighten me with Polish term for "projective sphere" ? > Thanks in advance, Can anyone help? boud

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Cosmo-torun April 2003