Remnants of a large Chinese rocket launched last week are expected to plunge back through the atmosphere this weekend in an uncontrolled re-entry being tracked by U.S. Space Command, the U.S. military said on Wednesday.

The Long March 5B rocket blasted off from China's Hainan island on April 29 carrying the Tianhe module, which contains what will become living quarters for three crew on a permanent Chinese space station. The Tianhe launch was the first of 11 missions needed to complete the station.

The rocket's exact point of descent into Earth's atmosphere as it falls back from space "cannot be pinpointed until within hours of its reentry," which is projected to occur around May 8, Space Command said in a statement posted online.