You can't rejoin this galaxy because you're already dead.

You can't enter this galaxy because the only computer player which may be taken over is already dead.

Someone is already taking over for a computer player this turn.  Wait until the next turn and try again.

You may not enter this galaxy since it is closed to new players.  

There are no computer players left to anthropomorphize.

A wormhole has popped up (as bugs often do) and altered reality among the players.  Please post recent game details and include any debug files within the Outland Games ƒ.

You can't create a game unless you are in the waiting room.

You can't rejoin this game.  Perhaps the game you were playing no longer exists.

You can't join that game since it is now full.

You can't join that game since it no longer exists.

You can't enter that game since it has already started and player(s) have elected not to allow humans take over computers.

To start the game, you must be waiting for that game to begin.

To leave a game, you must be playing one already.

To join a game, you must be in the waiting room.

The version of Spaceward Ho! you are running is old and needs to be updated.  Contact Outland about getting a new version.