20 years after 9/11: How satellites tracking disasters have changed

As the 20th anniversary of 9/11 approaches, satellite images show the devastation caused by the terror attacks that day and the evolution of disaster monitoring from space. The terrorist attacks on Sept. 11, 2001 involved four commercial airplanes that were hijacked and crashed into the World Trade Center towers in New York City, the Pentagon in Washington, D.C., and a field in Shanksville, Pennsylvania. More

(Source: Space.com - Sep 12)