The researchers learned that some of the presolar grains in their sample were the oldest ever discovered-based on how many cosmic rays they'd soaked up, most of the grains had to be 4.6 to 4.9 billion years old, and some grains were even older than 5.5 billion years.
"As soon as all of the objects are segregated, or no longer it is some distance a roughly paste, and it has a pungent characteristic - it smells adore injurious peanut butter".
Dissolving the paste in the acid reveals the presolate grains, allowing researchers to determine their age and the type of star to which they once belonged.More news: Selena Gomez defends ex's wife against social media trolls
"It's like burning down the haystack to find the needle", Heck said in the release.
These rays are high-energy particles that travel through our galaxy and penetrate solid matter.
"Some of these cosmic rays interact with the matter and form new elements. And the longer they get exposed, the more those elements form", he said.
"We have more young grains than we expected", Heck said.
Scientists previously had found a pre-solar grain in the Murchison meteorite that was about 5.5 billion years old, until now the oldest-known solid material on Earth. After isolating the presolar grains, Heck and colleagues found a lot of them dated to between 4.6 and 4.9 billion years. It picked up some indestructible chemicals as it floated through space, which are said to be up to 7 billion years old.More news: B.C.'s unemployment rate grows, but remains lowest in Canada
When the first stars died after two billion years of life they left behind the stardust, which formed into the block which fell to earth as the meteorite in Australia. "This is one of the key findings of our study", said Dr Heck.
Numerous grains recovered were between 4.6 and 4.9 billion years old, while others were older than 5.5 billion years. "With this study, we have directly determined the lifetimes of stardust". The undeniable fact that countless particles through the exact same duration had been discovered, would show that a birth trend of movie stars took place the Milky Way 7 billion years back. "It's not a straightforward way of measuring isotopic abundance and getting an age directly from that measurement".
However, other dating techniques, such as comparing the isotope ratios left behind by decaying radioactive materials, can not yet be used to provide an absolute date for these ancient dust grains.
The stardust represented time capsules dating to before the solar system and forms in the material ejected from stars and carried by stellar winds, getting blown into interstellar space. But they offer astronomers insight into how stars formed in the early stages of our galaxy. Those are only 4.4 billion years old.
"I'm still excited about just the idea of having a rock, taking a rock out of a cabinet, extracting minerals and learning something about the history of our galaxy", he said.
When small to medium stars (from about 0.5 to 5 times the mass of the Sun) approach the ends of their lives, they expand into red giant stars and blow off their outer layers.More news: US rapper Cardi B says she wants to be a politician