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small granule (of e

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They derive their name from their main component -- chondrules, which formed as molten droplets floating in space.
In one specimen, found in Antarctica, they discovered a new type of building block called sulfide chondrules.
The new discovery is that the so-called chondrules were formed during the first three million years of the solar system's development as well.
Showing that chondrules are as old as CAIs addresses a long-standing question of why chondrule formation should be delayed by up to 2 million years after CAIs.
Benton reveals a sequence of events that reflect a complex history: (1) chondrule formation and initial assembly; (2) brecciation; (3) thermal metamorphism and (4) shock veining.
Chondrules themselves formed through quick melting events in the dusty gas cloud -- the solar nebula -- that surrounded the young sun.
As chondrules cooled, iron-bearing minerals within them became magnetized like bits on a hard drive by the local magnetic field in the gas.
This technique enabled the researchers to study the orientation and position of individual micrometre-sized grain particles that had coalesced around the chondrule.
These findings suggest that chondrules formed from 2 million to 5 million years after inclusions appeared.
With their high precision measurements, they are able to date formation times for chondrules very precisely," he said.
Basaltic achondrites lack the rounded particles, or chondrules, found inside most stony meteorites.
The early family tree of our solar system's rocky planets features tiny glassy spheres called chondrules, found today inside ancient meteorites.
King at the University of Houston, scientists have been arguing over the origin of chondrules for two centuries.