Rare interstellar radioactive material found in Antarctic snow
The discovery of the rare isotope of iron, iron-60, backs up previous research which found that the substance was generated by supernovae, strong stellar explosions, within the last few million years and should be present in geological formations on Earth.Also on rt.com Aliens phoning home? Mysterious deep-space radio signals are more frequent than we thought
Researchers from Germany wanted to see if iron-60 created in stellar explosions continues to reach Earth from space. They thought there could be some in dust particles in the Local Interstellar Cloud, an area of interstellar space through which the Solar System is currently traveling, and theorized that these particles should land on Earth as it speeds past them.
The scientists took about half a tonne of snow from near the Kohnen polar research station in the Antarctic, an uncontaminated site. They melted it in Munich and successfully used a particle accelerator to extract single iron-60 atoms from the atoms of iron found in the sample.Also on rt.com Who ‘owns’ the Moon 50 years after mankind’s 1st ‘giant leap’
The team then ruled out other possible explanations for how the iron-60 could have ended up in the snow, including the possibility it came from inside our Solar System or from nuclear testing. “By ruling out terrestrial and cosmogenic sources, we conclude that we have found, for the first time, recent iron-60 with interstellar origin in Antarctica,” the scientists wrote in Physical Review Letters.
The interstellar radioactive snow gives scientists strong evidence that some of the Local Interstellar Cloud was generated by supernovae, powerful stellar explosions. The research team will now analyze old Antarctic ice to look for an increase in iron-60 in ice from about 40,000-50,000 years ago, as that is when the Solar System is thought to have entered the Local Interstellar Cloud.
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