Scientists weren't expecting this.

The NY Post says an asteroid the size of a football field passed Earth by a close distance of 119,500 miles Sunday. Now, that may sound like a big distance by our standards, but from an astronomical standpoint it's very close. In fact, it's half the distance between the Earth and the Moon.

It's being called a "surprise" because it was only discovered this past Saturday. Had 2018 GE3 been just a little closer, scientists and officials would have had little warning once the space rock plunged into the Earth's atmosphere.

That would not have been a good day for quite a few folks. asteroid this big is capable of causing some regional damage, depending on various factors such as composition, speed, entry angle and location of impact.