Hermian Type

Massive planetary impacts during the final stages of planetary formation are a common and often integral component to planetary evolution.  Such impacts formed Earth's Moon, and may well have given Venus its slow, retrograde rotation.  In the case of Mercury, such an impact made it into a Hermian Type planet.

When the great impact occurred, it blew off most of the planet's crust, revealing its mantel.  What was left was a relatively small world with what seemed to be a quite large metallic core, the result of the merger between the original planetary core and the core of the impactor.

In short, Hermian worlds are cratered, relatively airless bodies with an exceptionally high metallic content.  In many cases, they may even have a substantial magnetic field. 

On the surface, there is little difference between Ferrinian worlds and other airless, cratered planetary bodies.

Many Hermian worlds lie close to their suns.

Quick Facts

Hermian Worlds As Sunchasers: Many Hermian worlds orbit very close to their suns.  It is believed that the strong stellar winds of forming suns drive away most of the lighter materials that would otherwise go into forming the planet;  in many cases, the remaining lighter materials in the crust are removed through impact events during the planet's formation, leaving behind a metal-rich Hermian planet.


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ArcBuilder Universe concept John M. and Margo L. Dollan 2002-2004
This Page first uploaded June 13, 2004
Most recent update for this page June 13, 2004