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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