I think Ralgol is in fact... the green-bluish planet of Crys, Adan and perhaps even Sean's end.
The planet doesn’t have a name in PS3 so we are free to speculate that Ralgol is in fact that planet showed in some "alternative" endings.
1st. A shot from the Earth
2nd. A shot from the Untitled Planet [wich i think is Ralgol]
Can you find similarities with Earth? It's the same image! Only greener (which means the continents are the same) - the guys from SEGA didn't want to spend more hours with this ending =P
Ok, there are other differences... instead of a moon there are two other planets.
Ralgol in PSonline EpI&II intro
Hmm.... a green planet witch resembles Earth... where did I saw this before?
PSonline
A planet similar to Earth... but I don't see the moon... only 2 other planets (like that PS3 ending)
PSonline
Yes... no doubt, there are 3 planets... even the logo shows us 3 planets (I still believe the logo is meant to represent Algol, because I think this solar system has more than 3 planets)
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I am not saying PSonline follows PS3. This could be even after an PS4 disaster because PS3 proved this solar system to be one of the closest systems of Algol... (closer than that is obviously Copto = 1lightyear distance only)