In 1972, the Soviet Union launched a pair of space probes destined for Venus. While the USSR’s Venera 8 successfully reached its destination, a malfunctioning Soyuz rocket ensured its sibling Kosmos 482 craft never made it past Earth’s orbit.

The latest projections peg the 1,000-pound spacecraft’s reentry between May 8 and May 11. A complicating factor is that Kosmos 482 was designed to withstand the extreme heat and pressure of Venus, and so the module might not burn up upon reentry but instead hold together and crash into Earth.