sci-universe:

How did the Eta Carinae (Eta Car) star system create this unusual expanding nebula? No one knows for sure. About 170 years ago, it  mysteriously became the second brightest star system in the night sky. Twenty years later, after ejecting more mass than our Sun, Eta Car unexpectedly faded. Somehow, this outburst appears to have created the Homunculus Nebula. (via APOD)

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