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New Radiation Map Called "Holy Grail" of Supernova Observations
Cassiopeia A - a well-documented supernova remnant of a star that was once eight times the size of our Sun - has revealed what astronomers are calling a "holy grail observation" of astrophysics: a map of radioactive material thrown out from the star as it exploded in 1671 that explains how the star's core collapsed and formed either a neutron star or black hole.
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