Compared with Mercury (whose orbit, within our planetary family, is the most egg-shaped and tilted), the paths of the four outer giant ... tweaked these planets' paths around 4 billion years ...

A weak magnetic field likely attracted matter inward, contributing to the formation of the outer planetary bodies, from ...

until more dwarf planets were discovered and it was reclassified. There are many comets in the outer solar system. Comets are icy objects, which orbit the sun at very large distances. Halley's ...