September 29, 2022


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Every 200 million years something bad happens on Earth.  Scientists speculate why...

Every 200 million years something bad happens on Earth. Scientists speculate why…

We are part of a gigantic carousel that passes through the spiral arms of the Milky Way at a speed of about 220 km/s. This is circular Solar SystemThe sun is inside. One turn around giant black hole It takes about 200 million years.

The team behind the new geological discoveries believes that Dense clouds of gas in the spiral arms of our galaxy, interacts with comets at the edge of the solar system, and sends them toward Earth. it causes bombing the surface of our planetwhich has a significant impact on its geology.

The research team took Research the ancient continental parts of our planet Such as North American Craton in Greenland And the Pilbara Craton in Western Australia. They used the decay of uranium in zircon crystals to create a geological timeline spanning a billion years, from 2.8 to 3.8 billion years ago.

Isotopes of hafnium in zircon It allows scientists to distinguish periods in Earth’s history in which new magma accumulated, forming the Earth’s crust. A team led by Chris Kirkard, a geologist at Curtin University, Australia, discovered on a large time scale that crustal production patterns correspond to periods of complete solar orbit around the galactic centre. Provide additional confirmation Oxygen isotope researchwhich revealed a similar pattern.

The solar system moves along the Milky Way at a speed of 863,000 km / hWhile The spiral arms do this at a speed of 76000 km / h. This means that we, together with the Sun, traverse the galaxy, cross its arms, like fans across a Mexican wave in a stadium.

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makes it Icy bodies from the Oort Cloud at the edge of the Solar System They interact with the dense clouds of gas in the spiral arms of the Milky Way as they head toward Earth. these things It comes with more energy than asteroidsBecause it takes longer to accelerate.

The effect of effects on the composition of the skinIntensive production of the Earth’s crust was also observed in Study fields. These are small enamel balls formed by the fusion of meteorites or rocks that the meteorite smashed into. The globular deposits have been shown to be related to the Earth’s passage through the dense spiral arms of the Milky Way Between 3.3 and 3.5 billion years old.

May support age limitation for other deposits The conclusions reached by the Karkad teamAt the same time, he encouraged other scientists to think more The impact of the cosmic environment on Earth.