The snow held significant amounts of a form of iron that isn’t naturally produced on Earth.
-- A team of scientists hauled 500 kilograms of fresh snow back from Antarctica, melted it, and sifted through the particles that remained. Their analysis yielded a surprise:
Outer space objects ranging from dust to meteors regularly fall to Earth, but they are generally made of the same materials as our planet, since everything in the solar system, including the sun itself, assembled from the same building blocks billions of years ago. Because iron-60 is not among those common materials, it must have arrived from somewhere beyond the solar system.
What was left was hundreds of times more of the iron isotope than they expected."That’s really overwhelming," Koll said. Stars fling out a variety of tiny particles during their lifetimes, in addition to all the light and heat. But when the stars are younger, they’re generally throwing out lighter metals, like carbon and oxygen. Aging, massive stars and a certain type of supernova explosions, having spent many millennia fusing big nuclei into even bigger ones, can spew out particles of heavier metals, including iron-60 and its stable cousin, iron-56.
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