... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. October 5, 1998 . A Sunspot Up Close . ... Visible above is a close-up picture of a sunspot , a depression on the Sun's face that is slightly cooler and less luminous than the rest of the Sun . ... This high-resolution picture also shows clearly that the Sun's face is a bubbling sea of separate cells of hot gas. ... About APOD > . ...

... October 9, 1997 . Hale-Bopp and the North American Nebula . ... Explanation: Comet Hale-Bopp 's recent encounter with the inner Solar System allowed many breath-taking pictures. Above, Comet Hale-Bopp was photographed on March 8th in the constellation of Cygnus . ... The North American Nebula is about 1500 light years away, much farther than the comet, which was about 8 light minutes away. ... About APOD > . ...

Supernova 2009js in NGC 918 . This page is devoted to information on Supernova 2009js in NGC 918 . Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. Discovered independently by Lick Observatory Supernova Search (USA) and Koichi Itagaki (Japan). ... 2009/10/11.44 . 17.2 . ... Joseph Brimacombe . ...

... Scientific Topics · · · · · · · · · · · · Historical surveys : spectral and colorimetric surveys for AGN , surveys for UV-excess galaxies AGN fro m IR/submm surveys : 2MASS, IRAS, ISO, AKARI, SCUBA, SST, WISE, Herschel AGN fro m radio/ mm surveys : NVSS, FIRST, ALMA, Planck, and others AGN fro m X-ray/gamma-ray surveys : ROSAT, ASCA, BeppoSAX, Chandra, XMM, INTEGRAL, Fermi, HESS, MAGIC, VERITAS Mult iwavelength AGN ... The deadline for early online registration is April 30, 2013. ...

... 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. ...

... The distance scales of the objects are matched both by comparing the first derivatives of the angular velocity determined separately from radial velocities and proper motions and by the statistical-parallax method. ... Good agreement between the inferred 0 and our calculations based on space velocities suggests that the Lindblad relation holds throughout the entire sample volume. ... Brandt and Blitz (1993) published the distances and radial velocities for a total of 206 H II-regions. ... Astron. ...