An exhaustcloud forms around Launch Pad 39a at NASA's Kennedy space Center in Florida as space shuttle Endeavour soars into the sky on the STS-134 mission to the International space Station.
The bright yellow arcs that streak the marine cloud layer are ship tracks—clouds that form when water vapor condenses onto the myriad tiny pollution particles in ship exhaust.
划过海洋云层明亮的黄色弧线是船舶的航迹——那是些由水蒸汽与船舶排放出来的无数污染微粒凝结而成的云。
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At first it went up slowly in a cloud of orange exhaust and white vapor.