1.   The crack that appeared Friday appeared near the hole for the left shuttle booster exhaust.

2.   The space station has solar panels that can be damaged by shuttle exhaust.

3.   The Wake Shield must fly free of Endeavour to avoid contamination from shuttle exhaust and waste water.

4.   The US shuttle Discovery was to end its nine-day mission Sunday after it completed studies on the effects of shuttle exhaust and the global climate.

5.   The crew of the US shuttle Discovery was preparing to end its ten-day mission after completing studies on the global climate and the effects of shuttle exhaust.