Maybe I’m misinformed about this. But I was always told matter cannot be destroyed or created. But I have been told space is constantly expanding. Is this expansion of space not made up of “matter”? Where does it come from?
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That phase commonly comes from a chemistry teacher and neglects a few key words: in a chemical reaction matter can’t be created or destroyed. Others have already explained that matter can indeed be created and destroyed; we do it all the time!
This is one of my favorite fun facts when giving tours (particle physics)
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