Remnants of a supernova were found in Antarctic snow. The space dust could be 20 million years old.
A star collapses when it dies, spewing out space dust in a giant cloud of elements that make for very beautiful Hubble Telescope photos. The “explosion,” called a supernova, results in either a black hole or an incredibly small, dense star that no longer generates heat.
A supernova also shoots space dust out in all directions that travels through the universe, occasionally coming into contact with other stars, planets — whatever happens to be in its path.
Earth has been around long enough to collect particles from exploding stars, even though it’s difficult to find the evidence. But sometime in the past 20 years, space dust from a supernova intersected with Earth and settled in Antarctica. The dust itself could be as old as 20 million years.
Scientists found a strange version of iron in relatively fresh Antarctic snow, according to a study published in the journal Physical Review Letters. Specifically, it was an isotope of iron, Fe-60, that astronomers know was present when our solar system formed. The discovery of the iron-laden dust could help scientists form a clearer timeline of our solar system.
https://www.washingtonpost.com/science/2019/08/27/remnants-supernova-were-found-antarctic-snow-space-dust-could-be-million-years-old/?wpisrc=nl_rainbow&wpmm=1
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my space dust to be considerably newer than that:
