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Evolution Of Stars..............

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Posted by Yasir on March 24, 2001 17:57:10 UTC

i need answers to the questions for the following questions which arose after readin the following passage........
"the evolution of stars is considered to be a result of conservation of angular momentum. The stars are formed due to self gravitation of clouds of dust and gas in the interstellar space. These clouds of dust and gas may initially possess small angular velocity due to the rotation of the galaxy. Due to gravitational effect, these clouds of dust and gas may shrink to a dense object to conserve angular momentum
, the w of such an object increases tremendously.The process of gravitational contraction heats the stars to the point of luminescence and its internal temperature rises so much that a self sustaining nuclear reaction starts.The nuclear motion in some large stars become violently unstable nearly at the end of evolution, thus ending in a supernova explosion. The outer layer of the star is blown out in space,
leaving behind a very dense core where the nuclei come incontact with each other ,thus greatly reducing its mr^2 and increasing its angular velocity.Such a supernova remanant in the nearby crab nebula rotates 30 times per second .Such stars produce short pulses of radio and light."

the galaxy rotates.........about what?????
some details of supernova explosions. How are they caused?? what are the possible results/consequences?????????
why the outr layer is blown out?
what is the supernova remnant....the blown outer lyer or the left behind dense core......?????
a few lines about pulsars and why do they produce pulses of radio waves..?

there are a lot of them
ill be grateful if somebody answers in a comprehensive and simple manner avoiding complex equations....
i just want an introduction for furthur study///

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