Amazing Photos of How Clouds Cast Thousand-Mile Shadows Into Space

While on board the International Space Station, geophysicist Alexander Gerst spent a lot of time looking back down to Earth from 205 miles above.  In his tenure aboard the ISS he took loads of photographs, documenting hurricanes, floods, dust storms, and oil fields.  One of his favorite things, however, was taking pictures of how clouds cast shadows.  The results can be quite dramatic.