At Smithsonian Mag: Siraj and co-author Avi Loeb concluded from their analysis that Jupiter’s gravitational field was strong enough to bump many such long-period comets from the Oort cloud off course, bringing them very close to the Sun.
Okay but, seriously, if this data is correct, how would we know the extinction WASN’T fine-tuned?
t Phjys.org: Now, a research team from Imperial College London, the University of Bristol and University College London has shown that only the asteroid impact could have created conditions that were unfavourable for dinosaurs across the globe.
It’s certainly valuable new information. The outstanding puzzle has always been, why were all dinosaurs killed off but not all mammals or reptiles?
In which case, says an astrobiologist, the origin of life may be quite a bit easier than many of us envision.
Sixty-six million years ago, an asteroid hit the Yucatan Peninsula in Mexico and produced cataclysmic disruptions that, it is believed, killed off about 75% of species (the K/Pg extinction). But many researchers think there must have been other factors at work.