... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2013 December 29 . Time-Lapse Auroras Over Norway . Credit Copyright: Terje SЬrgjerd ; Music: Gladiator Soundtrack: Now we are Free . ... Pictured in the above time-lapse movie , auroras flow over snow covered landscapes, trees, clouds, mountains and lakes found near Kirkenes , Norway . ... Free lecture: APOD editor to speak in NYC on Jan. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2001 January 21 . Resolving Mira . ... FOC , ESA , NASA . Explanation: Most stars appear only as points of light. ... Mira was discovered to be the first variable star about 400 years ago by David Fabricus. ... Possible explanations include gravitational perturbation and/or heating from Mira's white dwarf star companion. ... About APOD | ...

Nova 1998 2 in M31 this image of the second Nova in M31 in 1998, was made from 38 exposures of 45 seconds integration time. It was made at September 21, 22h 20m UT. Telescope was a CG11 at f/6.3, no filters were used. The long list of processing steps caused the artefacts at the overexposed center of the galaxy and in many of the brighter stars. During the exposures thin clouds covered the sky but the CCD cuts through them, allowing me to obtain this result. ...

GCVS Variability Types and Distribution Statistics of Designated Variable Stars According to their Types of Variability ======================================================================== I. GCVS Variability Types. ... Amplitudes usually do not exceed 0.1 mag. ... RR Variables of the RR Lyrae type, which are radially-pulsating giant A-F stars having amplitudes from 0.2 to 2 mag in V. Cases of variable light-curve shapes as well as variable periods are known. ... RV Variables of the RV Tauri type. ...

... E.V. Kazarovets, N.N . Samus , O.V. Durlevich, S.V. Antipin, M.S. Frolov, N.N . Kireeva, E.N. Pastukhova Institute of Astronomy of Russian Academy of Sciences and Sternberg State Astronomical Institute of ... the Moscow State University ================================================================================ The 74th Special Name-list of Variable Stars , A.V. Kazarovets, N.N . Samus , O.V. Durlevich, S.V. Antipin, M.S.,Frolov, ... 3323 Samus, N.N., IBVS, 1997, No. ...

... Отмеченная наградами АстроТоп-а . ... 1) К участию в конкурсе допускаются все российские сайты на тему астрономии и космонавтики, и все русскоязычные сайты за пределами России. ... II) Сайт года . ... Победитель: Астронет - http://www.astronet.ru/ : подано голосов экспертов - 109 (всего - 129) . ... 3-е место разделили: Астрономия и Телескопостроение - http://www.astronomer.ru/ и Лента новостей космонавтики от Железнякова - http://www.cosmoworld.ru/spaceencyclopedia/hotnews/ : подано по 37 голосов; ...

... Here is a brief outline of the current theory of the events in the early history of the solar system: . A cloud of interstellar gas and/or dust (the "solar nebula") is disturbed and collapses under its own gravity. ... The gas cools off enough for the metal, rock and (far enough from the forming star) ice to condense out into tiny particles. (i.e. some of the gas turns back into dust). ... Once the larger of these particles get big enough to have a nontrivial gravity, their growth accelerates. ...