What’s worrying is not that we just saw a rock the size of a 10-story building flying past; what’s worrying is thinking about how many of these we haven’t seen. A rock that big made Meteor Crater in Arizona, and there haven’t (to the best of our knowledge) been any strikes that big since then. The closest we’ve come is Tunguska, and even that was over an uninhabited area. Something as big as this latest rock smacking down in a populated area would be a major catastrophe; not ELE by any means, but imagine if it hit on the outskirts of London, or Phoenix? The blast was estimated to be the equivalent of 10MT, which would level the city even if it wasn’t a direct hit. A strike out in the fields of Nebraska or Kansas would put a major dent in the crop growing there, and affect farming operations for years due to the ejecta.
Don’t want to worry you too much friend but stuff hits the Earth’s atmosphere all day, everyday. The majority of it is small stuff but we do get some big stuff. We’ve been hit by really big stuff in the past and we will be hit again. That’s just the way it is. Nothing we can really do about it. On the good side thanks be to God big old planet Jupiter is out there. Jupiter’s kind of like a cosmic short stop. It’s massive size and gravity pulls in a lot of the stuff that would otherwise come smashing into us.