X-Rays Expose the Boundary Where an Ancient Supernova Slowed Down, Called RCW 86
In the year 185, sky watchers in China noticed a guest star that flared brilliantly enough to be visible during the day for weeks before disappearing. That brief flash turned out to be a white dwarf star breaking itself apart in a Type Ia supernova. Centuries later, its memory is preserved in the faint form [...]
In the year 185, sky watchers in China noticed a guest star that flared brilliantly enough to be visible during the day for weeks before disappearing. That brief flash turned out to be a white dwarf star breaking itself apart in a Type Ia supernova. Centuries later, its memory is preserved in the faint form [...]
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