Today,the X-15 hangs in the Air and Space Museum in Washington,D.C.

VOA: special.2010.07.07

The Smithsonian's National Air and Space Museum in Washington,D.C.owns the plane.

VOA: special.2009.03.18

Science fiction writer Arthur C.Clarke described an object left on the moon to let aliens know when humans were able to travel in space.

VOA: standard.2010.04.16