A new feature that I like is the addition of the markers indicating that a battle took place there during an AI turn that resulted the loss of one of the player's assets (ship, shipyard, etc.).  However, if the marker is in the same place as a shipyard (see screen snapshot below), you cannot click or double-click on the shipyard to select it because the marker is eating the clicks.

Note: This scenario occurred because an AI destroyed my shipyard and then, when I had Ceibo I create a new shipyard, the new shipyard was placed in the same cell as the marker.

Note: Players can still access the shipyard by going to the planet management screen and clicking on the shipyard icon.

Question:  Do these markers have a life of some number of months or do they stay for the rest of the game?  If they have a life, how long is it?