You also see these spots from external damage from the sun.

这些黑斑也会因为严重的太阳晒伤产生。

According to Wang, solar wings are most susceptible to external damage, because they are large and thin, making them fragile when hit by space junk.

王亚男说，太阳能机翼最容易受到外部损坏，因为它们又大又薄，在被太空垃圾撞击时很脆弱。