As more space junk falls to Earth, should we be worried?

Last week, debris from a suspected Chinese booster rocket made an uncontrolled return to Earth, reportedly falling just metres from villages in Malaysia and Indonesia, and triggering a rebuke from Nasa. This follows the recent discovery of SpaceX debris on a sheep farm in regional NSW.Jane Lee speaks to ANU astrophysicist Dr Brad Tucker and reporter Natasha May about why more space junk is falling to Earth, what risks it poses to our safety