... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. June 6, 1998 . M100: A Grand Design . Credit: NASA . Explanation: Majestic on a truly cosmic scale, M100 is appropriately known as a Grand Design spiral galaxy . ... This Hubble Space Telescope image of the central region of M100 was made in 1993 with the Wide Field and Planetary Camera 2. ... About APOD > . ... NASA Technical Rep.: ...
... M100: A Grand Design . ... Credit: NASA Explanation: Majestic on a truly cosmic scale, M100 is appropriately known as a Grand Design spiral galaxy. A large galaxy of over 100 billion or so stars with well defined spiral arms , it is similar to our own Milky Way . One of the brightest members of the Virgo Cluster of galaxies , M100 (alias NGC 4321) is 56 million light-years distant in the spring constellation of Coma Berenices . ... Publications with keywords: M100 - spiral galaxy . ...
... 2000 August 4 . M15: Dense Globular Star Cluster . ... In fact, only 40,000 light-years away in the constellation Pegasus, M15 is one of the most densely packed globular star clusters in our Milky Way Galaxy. This stunning Hubble Space Telescope image of M15 shows thousands of individual stars across the central 10 or so light-years of the cluster, also cataloged as NGC 7078. ... Globular star clusters harbor from a hundred thousand up to a million stars and roam the Milky Way halo. ...
ASTEROIDAL DAMAGE TO THE EARTH: IMPLICATIONS BY ASTEROIDS RUBBLE PILES. ... 13, Moscow 119892, Russia, E-mail:san@sai.msu.ru In the cause of asteroids rubble piles its effective cross-section of collision to the Earth is determined not by consolidated body, but by cluster of its fragments. Since the stage of rubble piles may be ~108 years (see our communication at previous symposium), it may be significant for estimation the asteroidal damage to the Earth. ...
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