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NASA
Astronomy Picture of the Day: Supernova 1987 A
Details of the brightest supernova of modern times - supernova 1987A in the Large Magellanic Cloud. There are many links for additional information.
California Institute of Technology
Spitzer Science Center: Luminous Blue Variable
In examining the "Luminous Blue Variable" this site seeks to determine if the blue variable is "Destined To Be a Supernova." An image (or chart) is provided along with a brief description of the details of the picture.