Depends how big it is, the BFR that got the dinos was 6 miles across, this one may have been 50-100 feet. And besides it started to come apart 18 miles above the earth.
A few months ago, my seven year old said to me at bedtime "Dad, I think God used an asteroid to kill the dinasaurs to make room for the people." My wife and I thought it was a very profound statement for a youngster to make. It makes for a good story, eh? :)
MM
Can that size be detected, and if so ---why wasn't it news?
This is a theory, not fact. that is the dinos, were still around for another 10,000 years are so.