Even with all our modern telescopes, the professionals can't look at the whole sky at once. But the amateurs are everywhere. With relatively small telescopes, they can see these nearby supernovae, which are very bright - often brighter than their host galaxies.

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While this detector is smaller than those envisioned for the future, it's been in operation for a decade or two, so it actually stands a good chance of having detected the first neutrino from an identified supernova beyond the Milky Way and its closest companions.

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