Speeding space object triggered a warning. It wasn't an asteroid.

It's good to know that our planetary defense systems work. The European Space Agency revealed that on July 6 the automated systems that sleuth the skies for potentially hazardous objects like asteroids sent out a warning. "The object, estimated at around 50 m [164 feet] in diameter, was spotted hurtling towards Earth on a path that would take it uncomfortably close to the moon and our planet," ESA wrote. "But thankfully, this was no asteroid."SEE ALSO:If a scary asteroid will actually strike Ear