Stars and Stellar Evolution
http://amazing-space.stsci.edu/capture/stars/
http://www.geocities.com/CapeCanaveral/Launchpad/1364/Stars.html
http://btc.montana.edu/ceres/html/LifeCycle/starsbackground.htm
http://www.windows.ucar.edu/tour/link=/the_universe/Nebula.html
http://www.windows.ucar.edu/tour/link=/the_universe/Strange.html
http://www.windows.ucar.edu/tour/link=/the_universe/Galaxy.html
http://outreach.atnf.csiro.au/education/everyone/pulsars/
]]>]]>You must answer the next questions using the links
GENERAL ASTRONOMY
http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html