The present note is basically an announcement of a theoretical and experimental resolution of one of the most basic fundamental problems of physics, namely the very existence and reality of the Aether [1][2][3][4][5][6][7][8][9][10][11]. This is not only basic philosophy of science or insightful results in theoretical physics and cosmology [1-24] but more than that because it may lead to actually realizing the futuristic dream of free energy [25][26][27][28].Our mathematical and indirect experimental verdict is that the Aether exists and it can be equated to the empty set of pure mathematics [3,[12][13][14][15][16]. More precisely the Aether may be understood for all mathematical and physical purposes as being identical to the empty set [8][9][10][11][12][13][14] underlying the Penrose fractal tessellation universe [17] which obeys the A. Connes' corresponding dimensional function of his noncommutative geometry [18][19][20][21].It is then a relatively short distance to conclude from the above that cosmic dark energy is simply the energy stored in the Aether empty set [22][23][24] so that the agreement between the theoretical calculation and the numerous accurate cosmological measurements may be taken as an indirect experimental confirmation of this spectacular model for the [22][23][24]. In fact the mere fact that Penrose fractal tessellation is a well known and valid model for quasi crystals, i.e. a real material with five fold symmetry as well as for the cosmos at large [10,17], is a sufficient fact to reinvigorate an old analogy between photons and phonon [7][8][9][10][11].Seen in this larger imaginative new reality [7], we can go on confidently repeating what we have claimed for many years, that spacetime is physically real and may be regarded as a highly advanced material which can be harnessed to yield practically infinite clean, free energy via what we called a dark energy-Casimir nanotech reactor [15]. Such a reactor was thought of by many visionaries before but was never given anything like a firm mathematical and experimental justification as we did within the E-infinity theory proposal [21][22][23][24][25][26][27][28].We leave it to the historians of science to relate our findings to that of the Tesla-Einstein discussion about the Aether [5]. However it is interesting to note that while Einstein started by thinking that his theory of relativity is a proof that the Aether could not exist or at a minimum is a totally unnecessary assumption, in his later years Einstein modified his stance and came much nearer to the thinking of N. Tesla who was a firm believer in the reality of the Aether [2,[5][6][7].We think that although within the limited space of the present announcement we could not possibly give any detailed mathematical derivation, we should at least state some of the most important equations Open Access