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About matter and fields of forces 437 kB, 41 sek

"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)