Tears don't flow the same in space

High above Earth on 12th September 2001, an astronaut writes home

Visible from space, a smoke plume rises from the Manhattan area after two planes crashed into the towers of the World Trade Center. This photo was taken the morning of September 11, 2001. Image: NASA.

On this day in 2001, the world looked on in horror as four commercial jets were hijacked by terrorists and used as weapons to kill almost 3,000 people on U…