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Look up: protostar

  1. protostar
    Very dense regions (or cores) of molecular clouds where stars are in the process of forming.
    Found on http://skyview.gsfc.nasa.gov/help/dictio

  2. Protostar
    A `protostar` is an object that forms by contraction out of the gas of a giant molecular cloud in the interstellar medium. The protostellar phase is an early stage in the process of star formation. For a solar-mass star it lasts about 100,000 years. It starts with a core of increased density in a molecular cloud and ends with the formation of a T Tauri star, which then develops into a main sequence star. This is heralded by the T Tauri wind, a ty...
    Found on http://en.wikipedia.org/wiki/Protostar

  3. protostar
    (from the article `nebula`) ...has been collapsing, it does not have a smooth density distribution but rather consists of a chaotic jumble of smaller clouds. These cloudlets ... ...of a molecular cloud, one or more of its cores become unstable and subject to gravitational collapse. Good arguments exist that the central ... Strong win...
    Found on http://www.britannica.com/eb/a-z/p/124

  4. protostar
    A stage in the evolution of a young star after it has fragmented from a interstellar gas cloud but before it has collapsed sufficiently for nuclear fusion reactions to begin. It may last from 100,000 to 10 million years, depending on the mass of the star. A protostar is surrounded by a dense cocoon ...
    Found on http://www.daviddarling.info/encyclopedi


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23 November 2009

This day in history:
At sixteen minutes past five on 23rd November 1963, a British television institution was born. Doctor Who would go on to become the longest-running science-fiction programme in the world, eventually spawning twenty six seasons of adventures from 1963 to 1989. In total, eight actors have played the part of Gallifrey's most famous Time Lord. From the very first - William Hartnell in 1963 - to the very last - Paul McGann, in the 1996 TV Movie - the Doctor has wandered through time and space in his trusty time machine, an old type-40 TARDIS (Time and Relative Dimensions in Space). Although appearing to be nothing more than a battered blue police box, it is in fact vastly bigger on the inside than on the outside, and always departs with its familiar wheezing, groaning sound. read more

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