Hydra

Rapid observations using the European Southern Observatory’s (ESO) Very Large Telescope (VLT) have revealed the explosive death of a star just as the blast wave burst through the front of the star. For the first time, astronomers have revealed the shape of the explosion in its earliest and most fleeting phase. This brief phase was not observable even a day later, and it helps answer a host of questions about how massive stars become supernovae. Photo: ESO

Supernova explosion shape revealed hours after discovery

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26 hours after its discovery in the galaxy NGC 3621 (in the direction of the Hydra cluster, about 22 million light-years away), spectropolarimetry observations on ESO's Very Large Telescope revealed for the first time the early geometry of the explosion — when the shock erupted
Hydra. Source: Frank Fox / Wikimedia.

How does the hydra know where to regrow missing body parts?

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Hydra. Photo: University of California, Santa Barbara

The source of the evidence is 600 million years ago

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