What faint signals might be observable in the minutes or hours leading up to the visible supernova blast?

Answer

Neutrino bursts or subtle changes in the star’s luminosity or shape.

There are potentially observable, faint changes in the minutes or hours before the visible blast, such as neutrino bursts or subtle alterations in the star’s luminosity or shape as instability takes over.

What faint signals might be observable in the minutes or hours leading up to the visible supernova blast?

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