© Discovery News
One of the least likely places you might think astronomers would learn about ancient supernovae is at the bottom of the ocean, but in new research scientists have done just that.
Through the careful analysis of ocean sediment, tiny particles that originated from deep space have settled on the seabed, locking the chemical secrets to supernova processes that would have otherwise remained a mystery.
"Small amounts of debris from these distant explosions fall on the earth as it travels through the galaxy," said lead researcher Anton Wallner, of the Australian National University.
"We've analyzed galactic dust from the last 25 million years that has settled on the ocean and found there is much less of the heavy elements such as plutonium and uranium than we expected."
Supernovae are powerful explosions triggered when massive stars reach the ends of their lives. During these powerful events, many elements are forged, including elements that are essential for life to thrive - such as iron, potassium and iodine.
However, as pointed out by an Australian National University press release
, even heavier elements like lead, gold and radioactive elements like uranium and plutonium can be created. But it appears that the formation processes for the heaviest elements are at odds with current astrophysical theory.