Thank you for reply, Dave. I thought energy counts as matter, too. According to E=mc^2, matter and energy seem equivalent though they have different forms. Let me rephrase my question, is there a possibility of the space deprived of both energy and matter, "and" energy and matter without space?
What is the essence of space? Is it a property of matter? If not, is it an entirely new stuff distinct from matter? If the former is true, why does space seem so homogeneous to us while the distribution of matter seems so uneven. If the latter is the case, what does it mean by the matter without...