Plutonian Eon

The Plutonian Eon is the second oldest eon of Espan History, and it is commonly accepted to have begun close to 5091 million (about 5.091 billion) years ago when Espa was hit by another planet. It is during the Plutonian Eon that life is thought to have first arisen on Espa.

The Plutonian Eon is named after the Roman god of the underworld Pluto.

Events
At some point around 5.09 BYA Espa had a disastrous encounter with another planet resulting in a glancing blow that deposited iron into the planet and ejected tonnes upon tons of debris which let to the creation of a ring around the planet which in turn would accrete into it's major moons Azhban and Yattuk. Similar to earth the planets spin was greatly accelerated by this early impact and its estimated Espa immediately after the impact had days that would have been only 8 hours long. Espas newly acquired moons would have a stabilizing effect on the planets rapid rotation over the ages this rotation would come to slow to 31 hours and 35 minutes we are familiar with. Additionally the moons would introduce tides to the oceans.

Initially formed extremely close to the planet, these moons gradually moved away from Espa over the eons reducing the tidal effect and rotation speed.

Around 4.95 BYA, 250 million years after its initial formation Espa was able to form the first fragments of a solid crust, due to the planets mass it took significantly longer than the earth did to cool off. While it was cooling these fragments gradually transformed into the first tectonic planets of Espa, though unlike today Espa back then had hundreds of small plates.

By this time Espa had an atmosphere of predominantly Carbon dioxide, Water Vapour and Helium as the planet began to cool the atmospheric water rained down upon the surface forming the first puddles and lakes. These early lakes were highly acidic and the first places for Espa to form its primordial soups by 4.90 BYA.

As the water rained down and the Hydrogen and Helium escaped into space, Espa retained an almost 70% Carbon dioxide atmosphere with a secondary amount of Nitrogen, Nitrogen is an geologically stable gas and as such it would gradually build up in the atmosphere over the eons.

More water arrived with the onset of the Late Heavy Bombardment of the Odjoran system 4.75 BYA, which was a 200 to 300 million year long bombardment of meteors and debris left over from the systems formation, these meteors carried Minerals, Carbon and primitive proteins from outer space, which got mixed with the already present primordial soup. It's thus not long after that Espan Abiogenisis occurs somewhere around 4.71 BYA with an Biosignature appearing in 4.68 BYA

With heavier elements such as Iron gradually sinking to the planets core a very weak magnetic field became active around 4.65 billion years ago, only about 10-20% as strong it is today. As the Late Heavy Bombardment comes to a gradual close around 4.5 BYA it marks the end of the Plutonian Eon and the start of the Katagogian Eon.