Older tiles on Discovery look streaked from the plasma environment of re-entry. They stand out in photos because new tiles still appear a pristine dark black.

“发现号”上较老的板片的条纹是其在返回途中地球大气层等离子体环境造成的，在照片中它们更扎眼的原因是新的板片还保持着原来的深黑色。