2020-11-16

Tree rings or supernova affect the footprint of the earth

By yqqlm yqqlm

Science and Technology Daily (intern reporter Zhang Jiaxin) The latest research by Robert Brackenridge, a geologist at the University of Colorado at Boulder, shows that it occurs thousands of light years away from the earth. The large-scale energy explosion may have left traces in the biology and geology of the earth. Related papers were published in the latest issue of”International Journal of Astrobiology”.

The study explored the impact of supernova. A supernova is an explosion experienced by a star near the end of its evolution. It is one of the most violent events in the known universe. This kind of explosion is extremely bright, and the electromagnetic radiation exploded in the process can often illuminate the entire galaxy where it is located. One such eruption can release the energy that the sun can release throughout its life cycle in just a few months.

A very close supernova may wipe human civilization from the surface of the earth. Brackenridge, a senior researcher at the Alpine and Polar Institute at the University of Colorado at Boulder, said that even further afield, these explosions can still cause losses-exposing our planet to dangerous radiation and destroying the protection that protects us. Ozone layer.

Brackenridge explained that the radioactive isotope carbon-14 of carbon is very small on earth. . When cosmic rays from space bombard the Earth’s atmosphere, radiocarbon is formed. Normally, there will be a stable amount of carbon-14 every year. When trees absorb carbon dioxide, some of it is radiocarbon.

However, the amount of radiocarbon absorbed by trees is not stable, and sometimes the concentration of isotopes in the tree rings suddenly appears spikes, which has nothing to do with the earth’s environment. Many scientists speculate that these years-long peaks may be caused by solar flares or huge energy jets from the sun’s surface.

Brackenridge said that scientists have recorded supernovae in other galaxies that produce a lot of gamma rays, which can trigger radioactivity on the earth.The formation of carbon atoms. Although these isotopes are not inherently dangerous, the surge in their levels may indicate that energy from distant supernovae spread across hundreds to thousands of light years to reach Earth.

In order to study these possible effects, Brackenridge searched the tree-ring records for clues to these distant cosmic explosions. His findings indicate that, theoretically, supernovae closer to the Earth have caused at least four damage to the Earth’s climate in the past 40,000 years.

He compared the estimated time of the explosion of these stars with tree-ring records on the ground, and found that the eight relatively close supernovae under study seem to be related to unexplained peaks of radiocarbon on Earth. For example, a star 815 light-years from the Earth in Vela became a supernova about 13,000 years ago. Soon after that, the radiocarbon content on the planet soared by nearly 3%-an amazing increase! This may confirm the previous hypothesis:the potential impact of distant supernovae on the earth is”imprinted” in the tree rings.

Source:Science and Technology Daily