  I present here a new, indivisible planetary science paradigm, a wholly
self-consistent vision of the nature of matter in the Solar System, and
dynamics and energy sources of planets. Massive-core planets formed by
condensing and raining-out from within giant gaseous protoplanets at high
pressures and high temperatures. Earth's complete condensation included a 300
Earth-mass gigantic gas/ice shell that compressed the rocky kernel to about 66%
of Earth's present diameter. T-Tauri eruptions stripped the gases away from the
inner planets and stripped a portion of Mercury's incompletely condensed
protoplanet, and transported it to the region between Mars and Jupiter where it
fused with in-falling oxidized condensate from the outer regions of the Solar
System and formed the parent matter of ordinary chondrite meteorites, the
main-Belt asteroids, and veneer for the inner planets, especially Mars. In
response to decompression-driven planetary volume increases, cracks form to
increase surface area and mountain ranges characterized by folding form to
accommodate changes in curvature. The differences between the inner planets are
primarily the consequence of different degrees of protoplanetary compression.
The internal composition of Mercury is calculated by analogy with the Earth.
The rationale is provided for Mars potentially having a greater subsurface
water reservoir capacity than before realized.
