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.
They are built mostly of small stony grains, called chondrules
, barely a millimeter in diameter.
In one specimen, found in Antarctica, they discovered a new type of building block called sulfide chondrules
Members of the subclass of stony meteorites known as achondrites are completely devoid of chondrules
After making a few small strokes of the file, examine the sample's exterior and interior for the presence of chondrules
or shiny metal grains.
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.
Scientists frequently find chondrules
embedded in particles of interplanetary dust.
King at the University of Houston, scientists have been arguing over the origin of chondrules
for two centuries.
Chondrites consist in large part of small igneous spheroids called chondrules
(seen at lower left).