[Swagman105 (Geoff)]

I am sure the controversy referred to here was the lack of a permit given for the recovery of the fragments but not to the controversy about interstellar objects falling to Earth.
Our solar system itself evolved from a cloud of interstellar gas and dust. It was probably one of a cluster of stars that formed from an even larger region of gas and dust.
The powerful solar winds that resulted would have blown away most of the interstellar gas left over from the formation of our and other stars.
But what of the dust, the solid particulate matter of different sizes formed of generations of star deaths?
Our own solar system has vast numbers of these solid (ice or rocky) objects left over from its formation in the Kuiper belt and Oort cloud loosely held by our solar systems gravity.
How many more would have been lost to interstellar space wandering through its vast distances over billions of years. We are now starting to get an idea that there maybe just as many planets wandering in interstellar space as there are in orbit around stars.
I think it reasonable to think that interstellar space is not as empty of meteoric objects as perhaps we generally realise and that many of these wanderers formed in more exotic locations of our galaxy and with exotic compositions may find their way to our solar system and be trapped here and hidden among the many that formed in our local cloud.
It may still be considered a long shot to have one do a bullseye hit on our earth, but then there are probably many more entering our solar system being trapped or merely passing through than we probably think.