Most of the Earth is water. Of the part that is not liquid, only a percentage of that is populated. Of the parts that are populated, only a very small percentage is densely populated, given farm land, forests, arenas, parks, and fields.
You have better odds in winning the lottery than getting hit by something falling from space. However, as Douglas Adams may say, the impossible has an integrity the merely improbable lacks. You never know. Always bring a towel, just in case. I have mine over my shoulder even as I write this.