What is “NOTHING”? And did NOTHING exist before the Big Bang?

What was before the Big Bang? What is in a perfect cosmic vacuum? Nothing? No, because “nothing” does not exist! Instead, quantum foam exists...

Translated from German - Original by @AstroTim
Voice clone by ElevenLabs.io

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Photo credit: NASA/ESA

Sources:
https://www.popularmechanics.com/science/a28733/what-is-nothing/
https://bigthink.com/hard-science/nothing-exists-quantum-foam/