Source: ESA
Astronomers using images from the Hubble Space Telescope (HST) have been trying to find stars before they explode as supernovae. In 2006, supernova SN 2006bc was spotted in spiral galaxy NGC 2397, so astronomers got to work, sifting through previous images taken by the HST. They found that star, in the rising stage of brightness as it exploded. This seems to bring new evidences to supernova theories. It appears that stars with masses as low as seven times the size of our Sun can explode as supernovae. (read more)
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