Ptogn

Ptogn(pronunced /'ptogn̩/ or /'ptogən/) is the mother planet of the Olgrns, it lies at about 1.25 AU from the star(named "On", a F-type star) it revolves around.

Ptogn revolves the star On, a F-type star, and due to its distance to the star, it can sustain liquid water in most parts of the planet, and has a suitable temperature for most carbon-based life forms.

Ptogn has no natural satellites, but the space junks are so numerous that they have formed a ring around the planet.

The length of one Ptogn day is equal to about 27 hours 46 minutes and 40 seconds of the earth, and one Ptogn year has about 420.5 Ptogn days, that means the length of one Ptogn year equals to about 1.34 earth years.

The average pollution level of Ptogn is very low, which indicated that they have successfully got rid of most pollutions caused by previous industry activities, despite of this fact, only less than one billion Olgrns are living on the Planet Ptogn, and most Olgrns live in space colonies and on other planets.