Early Chinese astronomers thought the flashes of light in the sky were stars that appeared briefly then vanished.
Archaeologists have also found more clay horses, chariots and weapons.
One member of the group washes her face and eyes in her urine every morning.
Researchers think puppies may have been reared for sacrifice or plucked from the streets.
The system, dated to around the 3rd or 4th century A.D. and lost for centuries, lies in the foothills of the Tian Shan Mountains.
Among the thousands of artifacts were fossilized skeletons of rabbits, sheep, donkeys, rhinos, bears and birds.
Thousands of inscriptions record an executive order to find a magical elixir and "assorted awkward replies" from those who'd failed to do so.
The discovery rewrites the history of early Chinese engineering.
The pit may have belonged to a member of a noble family from the Zheng State.