“is still classified as speculation”
One of the hypocrisies of science, UFO’s are considered paranormal, yet some wild theory like this is considered to be fact by many scientists, along with black holes and global warming.
And the public laughs at UFO’s while sucking up this asteroid theory.
there is no physical evidence of UFO’s
The earth has lots of impact craters that are physical reality. The effort here is to study not only the crater but the possible impact material from the impacting object.
Sceptics wallow in the bliss of certainty and are unable to tolerate anything that falls outside their comfort level. The purpose of scientific endeavor is to transform the unknown into hypothesis and theory with facts rather than myth