Another day, another meteorite

20 Nov 2020

At https://phys.org/news/2020-11-asteroid-vt4-skimmed-earth.html ... the impact audit system in Hawaii spotted a close pass by of an asteroid on the 14th November [2020]. It was just 16 to 32 feet in diameter, about the size of a house. Not a mansion mind you. It came at the earth from our sunward blind spot and was not actually seen until 15 hours after approach, heading back out of earth's vicinity. It passed withing 1864 miles away, which could be regarded as a near miss, or nearly a near miss. It followed the edge of earth's shadow on its outbound journey. Puting it in context, the International Space Station is 250 miles upwards, so the asteroid came within about 7 times that distance.

 

One of the hotly disputed points of view of the K/T boundary event is the idea that the dinosaurs were already in decline prior to the arrival of the asteroid. This appears to be an artifact of uniformitarianism as sediments produced by the asteroid are dated over long periods of time, both sides of the event. Or that is one way to look at it. Mainstream would disagree. However, it would explain the idea of decline as the sediments are dated in diverse manner. Whatever the nature of the arguments it has captured the attention of paleontologists, and scientists do not like loose ends. They like to categorise what they find. In response to one group of paleontologists advocating a decline another group are not convinced. In a new study from the University of Bath and the Natural History Museum we have one side of the argument saying no decline happened - see https://phys.org/news/2020-11-analysis-refutes-dinosaurs-decline-asteroi... ... which is derived from www.royalsocietypublishing.org/doi/10.1098/rsos.201195 ... and presumably https://doi.org/10.1098/rsos.201195