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 space, or the space without matter? If both is not the case, what is the fundamental relationship between space and matter? Is the concept of space just a convenience without real substance? Then what does it mean by general relativity describing distortion of space due to gravity? Pardon me, these may seem to be a bunch of dumb questions as I didn't study physics in college.