In 1944, as Germany faced defeat, Nazi engineers proposed one of the most ambitious aircraft concepts in history: the Silbervogel, or “Silver Bird.” Designed by Eugen Sänger and Irene Bredt, it was a ...

In June 1944, a weapon of war quietly crossed the boundary of space, and almost no one was told. The scientists behind it would go on to build the rockets that took America to the moon.