What was that thing that hit the earth 66 million years ago?


The impact hypothesis was bolstered by the discovery of the 180-kilometre-wide (112 mi) Chicxulub crater in the Gulf of Mexico in the early 1990s,^[6] which provided conclusive evidence that the K–Pg boundary clay represented debris from an asteroid impact.^[7] The fact that the extinctions occurred at the same time as the impact provides strong situational evidence that the K–Pg extinction was caused by the asteroid.^[7] However, some scientists maintain the extinction was caused or exacerbated by other factors, such as volcanic eruptions,^[8] climate change, or sea level change, separately or together.