Chinese rocket debris set to hit Earth this weekend — but no one knows where

It's 10-stories tall and twice as heavy as a school bus, and it's set to crash back to Earth this weekend — but no one is quite sure where or when.

A piece of a rocket launched by China in late April is expected to re-enter Earth's atmosphere sometime late Saturday or early Sunday, according to experts and officials.

The 98-foot-long, 20-ton section of China's Long March 5B rocket is tumbling through space in an uncontrolled orbit at 18,000 miles per hour after blasting off last month carrying part of...