 There's been a string of incidents from falling debris from China's growing space sector. Much of it is what astrophysicists dub space junk, cast-off parts falling back to Earth from space. Last week, rocket debris from a satellite launch landed on a village in southwestern China. This past April, a blazing fireball was seen over California, the remains of a module from China's Tiangong space station burning up as it re-entered Earth's atmosphere.