The Pentagon has said it is tracking a chunk of a Chinese rocket that is expected to come back into the atmosphere in the coming days in an uncontrolled reentry. As of now, it does not know where the debris will land. The exact point where the rocket will enter the atmosphere will be known only within "hours" of its reentry, the US Space Command, a branch of the US military, said in a statement Tuesday. The core of the rocket, which China launched April 29, has been predicted to come back to Earth "around May 8", Space Command said....