A Soviet spacecraft, Kosmos 482, originally launched in 1972 to reach Venus, is now expected to crash back to Earth. Due to a rocket failure, it remained in Earth’s orbit and is now being pulled down by gravity. Scientists predict it may re-enter on Saturday morning (U.S. Eastern Time), but the exact time and location remain uncertain due to the satellite’s age and solar activity.

Weighing over 1,000 pounds and 3 feet wide, the craft could hit Earth at around 150 mph. While the chances of it landing in a populated area are “infinitesimally minuscule,” experts warn that cities such as London, Brussels, Phoenix, São Paulo, and Hiroshima lie within the re-entry path. Most of the satellite is expected to survive re-entry, though it may be heavily damaged. Under international law, any wreckage remains the property of Russia.