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Presolar grains are
interstellar solid matter in the form of tiny
solid grains that
originated at a time
before the Sun was formed.
Presolar grains formed...
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presolar material.
Presolar grains definitionally existed before the
Earth was formed.
Presolar grain (and, less frequently, "stardust" or "
presolar stardust")...
- they are less than one
percent (%). An
exception to this lies with the
presolar grains found in
primitive meteorites.
These small grains condensed in the...
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created the
presolar nebula. The
oldest inclusions found in meteorites,
thought to
trace the
first solid material to form in the
presolar nebula, are...
- W.; Lattmer, J. M.; Margolis, S. H. (1977). "Are
supernovae sources of
presolar grains?". Nature. 270 (5639): 700–701. Bibcode:1977Natur.270..700F. doi:10...
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hypothesised to have
formed from a
rotating disk of gas and dust
known as the
presolar nebula. Much of the nebula's gas,
primarily hydrogen and helium, formed...
- very rare.
Until the 1950s, no
other source for
moissanite other than as
presolar grains in
carbonaceous chondrite meteorites had been encountered. Then...
- rare, but is
found in high-grade
metamorphic rocks on Madagascar. Some
presolar grains in
primitive meteorites consist of hibonite.
Hibonite also is a...
-
known as
presolar grains, of
mineral grains from AGB
stars are
available for
laboratory analysis in the form of
individual refractory presolar grains....
-
carbide grains from the
Murchison meteorite had been
determined to be
presolar material. The
oldest of
these grains was
found to be 3 ± 2
billion years...
