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In 1965 Fritz Zwicky proposed a category of supernovae that he known as "Type V", defined as "excessively faint at maximum". there have been in simple terms participants, SN1961v and Eta Carinae. We now recognize that Eta Carinae used to be now not a real supernova, but when it have been saw at the present time in a far off galaxy we might name it a "supernova impostor". one hundred seventy years in the past it skilled a "great eruption" lasting twenty years, expelling 10 sun lots or extra, and survived. Eta Carinae is now stated because the so much sizeable, such a lot luminous big name in our quarter of the Galaxy, and it can be our simply instance of a truly big celebrity in a pre-supernova country. during this publication the editors and contributing authors overview its extraordinary historical past, actual country of the superstar and its ejecta, and its carrying on with instability. Chapters additionally contain its relation to different tremendous, volatile stars, the large celebrity progenitors of supernovae, and the "first" stars within the Universe.

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