Special & General Relativity Questions and Answers
How can matter just appear out of nowhere?
Because that is the way that the physical vacuum operates. This phenomenon can be explored in great detail in accelerator labs. I do not think that anyone really understands WHY nature is like this.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.