过多地曝露于电视或电脑的人工光源中可能是一个原因。
Exposure to more artificial light from TVs or computers is one theory.
他称自己诡异的成像手法源自于不同光源下长时间的曝光。
He explains this weird photography USES different light sources during long exposure times.
比如，绿色北极光源自于60到120英里(100到200公里)高的氧原子的碰撞。
For example, the green aurora pictured was the result of oxygen-atom collisions about 60 to 120 miles (100 to 200 kilometers) up.
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