syrf3763 Messages 16 Reaction score 0 Apr 7, 2013 #2 Is Energy mean momentum in your question? I'm no pro, but still trying my best to answer your question.;p Does light count? electromagnetic wave? isn't that depending on the definition of energy?
Is Energy mean momentum in your question? I'm no pro, but still trying my best to answer your question.;p Does light count? electromagnetic wave? isn't that depending on the definition of energy?
Vanadium 50 Staff Emeritus Science Advisor Education Advisor Gold Member Dearly Missed Messages 35,014 Reaction score 21,725 Apr 7, 2013 #3 Since a universe without matter would be observer-free, no measurements could be made so this is clearly not science.
Since a universe without matter would be observer-free, no measurements could be made so this is clearly not science.