Spacebase DF-9 Wiki

Space Debris is an event that will happen more often if your star system has a high Stellar Density. A notification will warn you that space debris is about to strike your ship, and you will have only moments to prepare. A red target will appear in real-time to show you where the debris will strike.

When the debris strikes, it will damage citizens, objects, floor tiles, and wall tiles. It will also cause fires.