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"We no longer contrast matter with forces and field of force as different entities, we know now that these concepts have to be merged. It is true, we call a spatial region free of matter, call it empty if there is nothing but a gravitational field. But space is never really empty because even far away in the universe there is starlight, and that is matter [...]"

Erwin Schrödinger, 1952
Audio-document from the lecture "Was ist Materie?"
English translation: taken from the article
"Our Conception of Matter"
(in What is Life? and Other Scientific Essays)