An unusually bright object was visible traveling across the sky at around 9:47 p.m. Pacific time on 27 July 2016:
— atty blatt (@AtticusBlatt) July 28, 2016
There was speculation that the object, which was reported from Colorado to California, was an unidentified flying object, a plane, or a meteor from the annual Delta Aquarid shower, which was especially active during that same timeframe.
Astronomer Phil Plait said despite the shower, the object likely wasn’t a meteor at all (but still not the mothership):
Observation reports from Utah indicate the second stage from the first Chang Zheng 7 rocket, launched Jun 25, reentered at 0440 UTC — Jonathan McDowell (@planet4589) July 28, 2016