I read in the press, that such a Korschinek Gustaf and other researchers at the Technical University of Munich, announced in the "Physical Review Letters, which have found evidence of a supernova explosion in Pacific sediments, south of Hawaii.
specifically say they found about 5000 meters deep layers dated to 2.8 million years, rich in iron-60 isotope to look "weird" on Earth, and that they believe came from the issuance of a supernova .
The anecdote of the story is that aim to relate this finding to the origin of man: this issue had led to increased cosmic rays that would have caused an increase in the temperature of the Earth (again according to these authors), resulting in the extension of the sheets which is apparent at this time to Africa.
So this sounds very nice. But in my opinion, it seems to me that they want to brew for a ride. With the aim of striking a story can do, which otherwise would not be much (people give a damn about the sediments, even iron-60 which have, or are very star within the world of geology sediments , lol), I relate to the origin of man always attractive, and we happen to have some stories a bit strange.
First, the rise in temperatures in Africa (and the resulting extension of the sheets) based on climate models suggested was a response to the early development of glaciers in the northern hemisphere. So the increase in global temperatures, nothing.
Moreover, the human race and had originated much earlier, and was bipedal humans before. Although I must admit that this point should read the original article, then comments that "this was the time when hominids came down from the trees" and the like, I see them almost certainly more characteristic of journalists who commented on news that scientists who have done the study.
Anyway, The study is interesting because it is of the first times that recognizes an astronomical event of its kind in the geologic record. With what I can not agree is with the ways that seek to sell. A custom (that of ambiguity, selling what it studies is not to make them more attractive to the media) that is quite common in science, often causing confusion and inappropriate comments.
Anyway, that's when we all come from a powder ... but no stars.
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