What is the link between meteors and dinosaurs?

the link is that it is a theory that a huge meteor or comet wiped out the majority of the dinosaurs when it impacted on the earth's surface and caused a huge amount of dust to rise into the air and blocked out the sun which meant that the dinosaurs could not breathe and probably froze to death and the impact would have caused an explosion that would be an equivalent to thousands of atomic bombs going off at once I am not totally sure of the facts but this is a start for you...also I think this is a theory and may not have happened at all unless we have testamony from someone who was around back then...sorry about the pun