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Ejecta from SN 1987A impacted ring of material lost from the progenitor star 10 years after the explosion. The ring was 0.75 light years from

Ejecta from SN 1987A impacted ring of material lost from the progenitor star 10 years after the explosion. The ring was 0.75 light years from the supernova explosion. Assuming a constant velocity, how fast was the ejecta moving in km/s

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