Just weeks ago, scientists warned that a "city killer" asteroid had a small chance of hitting Earth. While that prediction was thankfully revised, the planet may have to worry about another object plummeting down from the heavens — a 1970s spacecraft called Kosmos 482.

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

It's too early to know where the half-ton mass of metal might come down or how much of it will survive reentry, according to space debris-tracking experts.

Dutch scientist Marco Langbroek, a lecturer at Delft University of Technology in the Netherlands, predicts the failed spacecraft will reenter around May 10. He estimates it will come crashing in at 150 mph, if it remains intact.