Every 27 million years the Earth is hit by a global catastrophe
American scientists performed statistical analyzes on the dates of 10 recognized mass extinction events that killed any tetrapod (animals with four limbs). They detected an underlying “statistically significant” frequency of mass extinctions in a similar cycle of approximately 27.5 million years. This data coincides with the fact that it is known that three of the massive species killings on land and in the sea occurred at the same time as the three largest impacts of the last 250 million years, each capable of causing a global disaster and leading to extinctions.
What causes these cycles?
If mass extinctions coincide with eruptions and massive asteroid impacts, the challenge now is to explain what mechanism could make these eruptions so regular, how they align with these rocky collisions from space.
Thus, astrophysicists hypothesize that periodic comet showers occur in the solar system every 26-30 million years, producing cyclical impacts and leading to periodic mass extinctions. And considering that the Sun and the planets traverse the crowded midplane of the Milky Way approximately every 30 million years, during those times, comet showers are possible, causing large collisions on Earth.
“It appears that the impacts of large bodies and the pulses of the Earth’s internal activity that create a flooded basalt volcanism may be marching at the same rate of 27 million years as the extinctions, perhaps at the rate of our orbit on the Via Milky, -which trigger showers of comets that have the potential to end all life on our planet- “said Michael Rampino, researcher in the Department of Biology at New York University and leader of the study.