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The more ancient star dust found in a meteorite
And' MOST' of the "old" of the Earth and much more of the Sun. Has between 5 and 7 billion years old the oldest star dust ever found on Earth: it is enclosed in a meteorite that fell in Australia 50 years ago and dates back to a time in which our planet and the entire Solar System didn't exist yet. "It is the solid material that is oldest ever found on our planet, and tells us how stars are formed in our galaxy," explained Philipp Heck , coordinator of the study published in the journal of the american Academy of sciences (Pnas), and signed by the researchers of the university of Chicago. These are minerals or crystals before, which were formed before the birth of the Sun, of the solid samples of stars.

These are grains of dust, stellar were trapped in the meteorites, intact for billions of years. In the substance of time capsule of an earlier era to the birth of the Solar System. But these crystals before are not easy to find: they are rare in fact and present only in approximately 5% of the meteorites fallen on the Earth. The Field Museum of natural history in Chicago has the largest collection of crystals before the meteorite that fell in Australia in 1969 in Murchison in Victoria.

researchers have discovered that some of these crystals are the oldest ever found, with an age that ranges between 4.6 and 4.9 billion years, some even over 5.5 billion years. Older then the Sun, 4.6 billion years, and Earth, which is 4.5. But this was a unique discovery. These crystals are formed when a star dies, and they can tell us then something about the history of the stars. Apparently, some 7 billion years ago it would have been a sort of baby boom in the astral.

"We have crystals more young people than expected. Our hypothesis is that most of these grains were formed at a time of intense star formation - ends - An era preceding the birth of the solar System, when they formed more stars of normal".

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