Venus Express was all set to launch, but ESA engineers discovered that small particles were contaminating the spacecraft, so the liftoff was pushed back. Engineers removed the spacecraft from its upper stage booster, opened up the fairing, and discovered that insulation material from the fairing had fallen onto the spacecraft. Fortunately, the pieces of material are large enough to see and remove with tweezers and vacuum cleaners. Once removal is complete, the spacecraft and booster will be reassembled and prepped for launch - before its launch window closes on November 24.