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  1. [The wiki page source](https://en.wikipedia.org/wiki/SN_1987A)

    And a more complete description:

    >A time sequence of Hubble Space Telescope images, taken in the 15 years from 1994 to 2009, showing the collision of the expanding supernova remnant with a ring of dense material ejected by the progenitor star 20,000 years before the supernova.

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