Is there a way to tell which spaceship parts the other civs have built, where they are, and how close they are to a science victory?
This will show you how far every nation has progressed towards completing the spaceship.
On my screenshots all nations are still unknown because I made this screenshots in a new game on turn 1.
It only shows the parts added to the capital. Although I don´t think CPU´s will do this, Human Players can (and likely will) simply leave them outside their capital, until they have all 6 Parts completed, them move them in and add them all in a single turn, and the other players will only see the "Completed Apollo Project" Notification. Therefore, getting visibility of enemy player´s capitols is important!