SpaceEngine

Is the Facebook page Scientify related with Space Engine? Because the logo is very similar, almost identical... I don't know if that's a coincidence or not, but it's a bit weird.

It's not a small page, it has 163K followers, maybe even more than Space Engine

No it's not. I believe I have seen that user on Discord, asking if it was ok to use that logo, quite some time ago. As far as I know, the team was not against.