The Venera mission, which launched from Kazakhstan on March 31, 1972, failed long before the Soviet Union could attempt to touch down on Venus. Because of a propulsion problem, it never escaped Earth's orbit. A half-century later, the landing capsule was predicted to reenter the atmosphere. That day arrived on Saturday, May 10.

A Soviet-era spacecraft meant to land on Venus a half century ago is expected to plunge uncontrolled back to Earth within days.

The 50-plus-year-old spacecraft was trapped in Earth orbit for decades. Now, it has likely fallen back home, according to the European Space Agency.