The Tom Van Flandern model was first proposed in 1993 in the first edition of his book. In the revised version from 1999 and later, the original Solar System had six pairs of twin planets, and each fissioned off from the equatorial bulges of an overspinning Sun, where outward centrifugal forces exceeded the inward gravitational force, at different times, giving them different temperatures, sizes, and compositions, and having condensed thereafter with the nebular disk dissipating after some 100 million years, with six planets exploding. Four of these were helium-dominated, fluid, and unstable. These were V (Maldek, V standing for the fifth planet, the first four including Mercury and Mars), K (Krypton), T (transneptunian), and Planet X. In these cases, the smaller moons exploded because of tidal stresses, leaving the four component belts of the two major planetoid zones. Planet LHB-A, the explosion for which is postulated to have caused the Late Heavy Bombardment (LHB) about 4 eons ago, was twinned with Jupiter, and LHB-B, the explosion for which is postulated to have caused another LHB, was twinned with Saturn. In planets LHB-A, Jupiter, LHB-B, and Saturn, the inner and smaller partner in each pair was subjected to enormous tidal stresses, causing it to blow up. The explosions took place before they were able to fission off moons. As the six were fluid, they left no trace. Solid planets fissioned off only one moon, and Mercury was a moon of Venus but drifted away as a result of the Sun's gravitational influence. Mars was a moon of Maldek.