A car-size asteroid flew within 1,830 miles of Earth over the weekend — the closest pass ever — and we didn't see it coming

· An asteroid the size of a car flew within about 1,830 miles of Earth this weekend — closer than any known space rock has ever come without crashing into the planet.
· A NASA-funded program detected the asteroid, called 2020 QG, six hours after its close approach.
· If the asteroid had hit Earth, it probably would have...