Atlas
Atlas is a sort of unknown in No Man’s Sky’s realm. In time, as you progress through the story and move ever closer to the universe’s center, you’ll come to understand just what powers this mystery and why it’s choosing to push you down the path of discovery. It’s one of the central elements of the entire game, so you’ll definitely want to pay close attention as you traverse through the world and learn from the many relics and monuments left behind by colonists long since gone.
You don’t meet Atlas immediately, though. After proving your skill out in space, helping others and seeking knowledge, you will become acquainted with this alien/entity/conglomerate/mind/thing. From there you will be offered a new path towards your goal, one that is all about embracing the unknown and unlocking pathways that would otherwise be locked to you. New technologies, resources, and a wealth of discovery are locked behind that weird sentient sphere.
The one thing that is very clear about Atlas, though, is that it has a direct connection to you on a primal level. Of all the beings you’ll meet, this one is clear at all times, speaking not out loud but to your very mind and soul. It knows what you want before you even do and it seeks to give you the tools to make those dreams reality should you decide to embrace your inner desires.