The spacings of the planetary orbits are divided into three sequences, 1) equal differences ~.3 AU between Mercury, Venus and Earth, 2) equal-- 9.6 AU (32 times the former) between Uranus, Neptune and Pluto, and 3) the doubling of orbit spacings between Earth- Mars ~.6 AU ; Mars - Asteroids ~1.2 AU ; Asteroids - Jupiter ~2.4 AU; Jupiter - Saturn ~4.8 AU and Saturn -Uranus ~9.6 AU. The doubling sequence has it's 0, zero starting point at Venus, and ends at Uranus, both planets being bracketed by equal distance neighbours. interestingly, These two planets, Venus and Uranus, also happen to be the ones with retrograde rotation, possibly though,- from different causes. so: coincidences that are indicators of the causes of present stability ? *revisited from the cesspool. and the related Newton's Pebbles. thank you. may be they are related they definitely are linked.