... 2016 February 5 . MassiveStars in NGC 6357 . ... Explanation: Massivestars lie within NGC 6357 , an expansive emission nebula complex some 6,500 light-years away toward the tail of the constellation Scorpius . In fact, positioned near center in this ground-based close-up of NGC 6357, star cluster Pismis 24 includes some of the most massivestars known in the galaxy, stars with nearly 100 times the mass of the Sun. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...
... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 February 13 . Southwest Mercury . Credit: Mariner 10 , NASA . Explanation: The planet Mercury resembles a moon. ... In fact, the Earth is the only planet more dense. ... From Earth , Mercury's proximity to the Sun cause it to be visible only for a short time just after sunset or just before sunrise. ... About APOD | ...
. Prague, August 16, 2006 . Present classification : Suggested: . X, XB, XF, XI, XJ, XND, AM (move to cataclysmics), X, X N, XNB (approximately corresponds to XNG, a B star orbiting a compact object), Xlm (low mass), Xhm (high mass), Xmq (microquasars). In this class, advice from experts is especially needed . X-RAY VARIABLES
... 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. ...
Supernova Gallery The purpose of the Bright Supernovae web pages is to provide a place where people can find reference images of Supernovae. ... This is an RGB color image of Supernova 2003gs in NGC 936 Credit: Pablo Canadia . Used by permission. (click on image for full resolution) . ... This is an LRGB color image of Supernova 2003cg in NGC 3169 Credit: Pollux observatory . ... Credit: Nick Suntzeff Used by permission. (click on image for full resolution) . ... Credit: AURA/NOAO Image Library . ...
... 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; ...
... 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. ...
ABSOLUTE PROPER MOTIONS OF 331 OPEN CLUSTERS . ... The proper motions of stars in the fields of 331 open clusters were taken from Four-Million Star Catalog (4M-catalog) of positions and proper motions (Volchkov et al. ... The absolute proper motions for 21 young open clusters have been derived by comparison of precise relative proper motions of individual stars and their corresponding absolute proper motions. ... Sign of proper motions in RA . ... 0.0001 arcsec/yr . ... rms error in RA proper motion . ...
Shades of Deep Purple (USA: Tetragrammaton 1968 ; Europe: EMI Parlaphone 1968 ; Japan: Polydor 1968) (CD) . Deep Purple's debut album, recorded very hastily. ... Tracks: . ... Wring That Neck (Blackmore/Lord/Simper/Paice) . ... All tracks written by Blackmore/Gillan/Glover/Lord/Paice . ... Painted Horse (Blackmore/Gillan/Glover/Lord/Paice) . ... Child in Time (Live, 690924) (Blackmore/Gillan/Glover/Lord/Paice) . ... Bonus tracks on Japanese CD: Lazy (edited) (Blackmore/Gillan/Glover/Lord/Paice) . ...