One of the end game condition is "Era Limit Reached". In tool tip we have following text: One Empire has reached the last Era.

If I or someone reach as first the last era then the game will end?  That cannot be right. 

Maybe has someone good answer for me. 

Obtaining all stars in the contemporary era ends the game, is what that means. Someone who manages that, usually, is someone who is already quite ahead of other players

The tool tipp text should be changed urgently, because unfortunately misleading.