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marcos , 5 hours ago Because they have mass. They don’t have “mass at rest”, but they are never at rest anyway. Do you remember that famous E = mc^2 equation? Everything that has energy has mass.
Because they have mass. They don’t have “mass at rest”, but they are never at rest anyway.
Do you remember that famous E = mc^2 equation? Everything that has energy has mass.
E = mc^2