1. For gravitational energy is negative, while rest mass and kinetic energy are positive.

2. For a compound particle, the constituents ' rest mass and also their kinetic energy of motion and potential energy of interactions contribute to the particle's total mass.

3. About 1046 joules, approximately 10% of the star's rest mass, is converted into a ten-second burst of neutrinos which is the main output of the event.

4. The higher rest mass energies of the proton and Antiproton yield a total of 1877 MeVt per annihilation event, compared with 1.02 MeV released by electron-positron annihilation.

5. Antiparticles A pair of elementary particles, such as the electron plus positron or the proton plus antiproton, that have an identical rest mass but a charge, strangeness, and other fundamental properties of equal magnitude but opposite sign (positive rather than negative and vice versa)