Did 'dark matter' or a star called Nemesis kill the dinosaurs?
Friday, December 11, 2015 - 08:02
in Astronomy & Space
The dinosaur extinction 66m years ago was most likely caused by a comet or big asteroid hitting the Earth. But given that asteroids don't actually hit our planet very often, could this really be the whole story? Many scientists are now asking whether some sort of cosmological event could have boosted the number of comets at the time, making such a collision more likely.