
The label "space rock" feels like an understatement for what NASA just observed.
A rock is something you throw at a window to get someone's attention. A rock holds down your picnic blanket to keep it from flapping in the wind. This rock, at 660 feet wide, spans two American football fields — and then some.
The asteroid, called 1997 QK1, made its nearest approach in space on Aug. 20 at 1.9 million
