The Japan Aerospace Exploration Agency (JAXA) and others have discovered a substance and structure that seems to have played the role of a "cradle" that protects water and organic matter from being decomposed and changed by heat in the samples brought back from the asteroid Ryugu by the Hayabusa2 spacecraft.
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Ryugu samples brought back
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Home Science and technology Ryugu samples brought back
"Cradle" material that protects organic matter in Ryugu samples Hayabusa2
brought back
The Japan Aerospace Exploration Agency (JAXA) and others have discovered a substance and
structure that seems to have played the role of a "cradle" that protects water and organic
matter from being decomposed and changed by heat in the samples brought back from the
Ryugu samples brought back
Hightricker
2. matter from being decomposed and changed by heat in the samples brought back from the
asteroid Ryugu by the Hayabusa2 spacecraft. Research teams such as the Japan Agency for
Marine-Earth Science and Technology (JAMSTEC) made the announcement. There is a
theory that water and organic matter on Earth were transported from other celestial bodies,
and such structures may be the key to understanding the origin of water and the process
from organic matter to life. A paper will be published in the British scientific journal Nature
Astronomy on the 16th.
Motoo Ito, chief researcher at the Kochi Core Research Institute of the Ocean Organization
of Japan, and others of the research team examined the sample in detail at a level of 1
micrometer (1/1000th of a millimeter) or less using a synchrotron radiation facility that
analyzes the internal structure of materials. . As a result, we detected a large number of
organic substances containing many hydrocarbons (aliphatic hydrocarbons) in which carbon
atoms are chained together. According to the team, similar techniques have never been
detected in other meteorites.
In addition, organic matter was intermingled in ``hydrated silicate minerals'' that are widely
present in rocks of the earth. This mineral in the sample had a coarse-grained structure that
was not easily affected by heat. For this reason, the hydrated silicate minerals can be
considered to have played a role like a cradle that protects the water and organic matter
from being decomposed and changed by heat when they are transported from other
celestial bodies to the earth.
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Meanwhile, the research team investigated the composition of "isotopes" of the same
element with different mass numbers in hydrogen and nitrogen. As a result, the
composition of hydrogen and nitrogen on Ryugu was found to contain more heavy isotopes
than those on Earth. Previous studies have shown that materials in regions far from the
center of the solar system tend to be rich in heavy isotopes of hydrogen and nitrogen. It has
been suggested that Ryugu may have formed in the outer solar system, but the results of
this analysis provide direct evidence.
Water-containing minerals and organic substances such as amino acids have been found in
carbonaceous meteorites, a type of meteorite found on Earth. The home of these
carbonaceous meteorites is asteroids such as Ryugu. While the Earth lost information about
its birth due to heat and other factors, Ryugu is less affected by heat and still retains organic
matter and hydrous minerals from the time the solar system was formed about 4.6 billion
years ago.
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