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from the The-sky-is-falling!-The-sky-is-falling! dept.
Scientists find increase in asteroid impacts on ancient Earth by studying the Moon
An international team of scientists is challenging our understanding of a part of Earth's history by looking at the Moon, the most complete and accessible chronicle of the asteroid collisions that carved our solar system.
In a study published today in Science, the team shows the number of asteroid impacts on the Moon and Earth increased by two to three times starting around 290 million years ago.
"Our research provides evidence for a dramatic change in the rate of asteroid impacts on both Earth and the Moon that occurred around the end of the Paleozoic era," said lead author Sara Mazrouei, who recently earned her PhD in the Department of Earth Sciences in the Faculty of Arts & Science at the University of Toronto (U of T). "The implication is that since that time we have been in a period of relatively high rate of asteroid impacts that is 2.6 times higher than it was prior to 290 million years ago."
It had been previously assumed that most of Earth's older craters produced by asteroid impacts have been erased by erosion and other geologic processes. But the new research shows otherwise.
"The relative rarity of large craters on Earth older than 290 million years and younger than 650 million years is not because we lost the craters, but because the impact rate during that time was lower than it is now," said Rebecca Ghent, an associate professor in U of T's Department of Earth Sciences and one of the paper's co-authors. "We expect this to be of interest to anyone interested in the impact history of both Earth and the Moon, and the role that it might have played in the history of life on Earth."
Earth and Moon impact flux increased at the end of the Paleozoic (DOI: 10.1126/science.aar4058) (DX)
(Score: 1, Interesting) by Anonymous Coward on Saturday January 26 2019, @08:11PM
Well the scientific way to go about it is to first come up with some explanations. Then, assuming the explanation is true, deduce a prediction about something that would be otherwise surprising (is unlikely if some other explanation were correct) will happen in the future. Finally, you compare the future outcome to the prediction(s).
Here it looks like they skipped the last two steps: They came up with a possible explanations and then without doing anything else concluded it is correct.