... The spectrum of the brightest star, our Sun, shows several dark gaps perpendicular to the flow of it’s colours (figure 1). These so called spectral absorption lines where discovered in 1802 by the English scientist William Wollaston. ... Some stars as Pollux show a spectrum similar to that of our sun with strong Ca II and Fe II lines, others as Sirius or Vega show strong absorption lines of hydrogen, others, as Mira show very complicated spectra due to molecular absorption lines (see figure 5). ...
... Piotrovich Main Astronomical Observatory, Pulkovo, St. Petersburg, Russia Received May 24, 2006; in final form, July 7, 2006 Abstract--We have used two astrometric methods developed at the Main Astronomical Observatory of the Russian Academy of Sciences--the method of apparent-motion parameters (AMP) and a direct geometrical method (DGM)--to derive the orbit of the star S2 around the Galactic center, and thereby the mass of the supermassive black hole at the Galactic center. ... Relative positions. ...
... Освоение космоса (Модератор: Chepurny ) > . NASA - Cassini-Huygens . ... NASA . ... Оффлайн . ... Благодарностей: 0 . ... Ответ #40 : 27 Июнь 2007, 16:06:57 ? ... Июнь 13, 2007 - Результат обработки полученных зондом "Кассини" данных позволил ученым сделать вывод о том, что Энцелад, из которого в космос <хлещут> струи водяного пара, не уникален для системы Сатурна. ... http://www.universetoday.com/2007/06/13/two-more-of-saturns-moons-are-blasting-out-particles/ . ... Благодарностей: 1063 . ...
... Space activity at the beginning of XXI-st Century view from inside G.M.Chernyavskiy STC for Earth Space monitoring of FSUE , Russia 1. The systemic approach in astronautics Everyone who has linked his life with astronautics and those who are interested in the future of the inhabitancy medium and its expansion up to cosmic scales, are troubled about the current state and development of space activity in the World and in the Native Land of the first artificial Earth satellite (AES). ...
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