More than two years have passed since the surface material of the asteroid Ryugu was brought to earth in a capsule. Ever since then, scientists have been delving into its composition in order to know the role it plays in the solar system's evolution.
Building Blocks of Life in Asteroid Ryugu
Now, Science Alert reports that the latest findings verify the links between the organic compounds on chondrite meteorites that have reached the earth's surface and the chemistry of the asteroids that they belong to. There were two papers conducted about the matter, both of which were published in Science. They can be accessed here and here.
By examining the differences and commonalities that the Ryugu specimens and carbonaceous chondrites on earth share, scientists can see current meteorite collections in a new light. This means that actual samples of asteroids can help in verifying hypotheses that are based on the small chunks that reach the earth's surface after blazing through the atmosphere.
Part of the molecules that were recently identified were several amino acid types that mix in order to come up with the proteins that organisms need for life. These are usually referred to as "building blocks of life" because of their vital role in facilitating life.
SciTechDaily also reports that organic molecules are considered building blocks of life and comprise various carbonaceous compounds mixed with oxygen, hydrogen, sulfur, nitrogen, and other atomic elements. However, such molecules can also result from chemical reactions that do not involve existence. This supports the notion that chemical reactions within asteroids may lead to some of the ingredients for life.
Overall, there were reportedly 20,000 organic molecules within 5 grams of the specimen. This includes amines, carboxylic acids, and aromatic hydrocarbons.
The results support the notion that the building blocks of life reached the earth through asteroid collisions in a form that was already complex. However, the combination of organic dust that turned into a replicating chemistry of some sort is still a subject of debate. Nevertheless, being able to confirm that space harbors the conditions to foster many important organic compounds serves as a good start for scientists to delve into and explain further.
ALSO READ: Asteroid Ryugu Samples Provide More Clues on the History of the Solar System
Asteroids Offer Glimpse of the Solar System's Earlier Development
In essence, asteroids are leftovers from the solar system's formation, which took place roughly 4.5 billion years ago. They also shed light on the earliest times of the earth's formation.
With particular chemical markers, scientists can try looking into the time and location of asteroid Ryugu's formation. This, in turn, offers a view of the conditions that were present at a particular time in the solar system's development.
Geochemist George Cody, who is from the Carnegie Institution for Science, says that there are some organic molecules within the Ryugu specimens that predate the formation of the sun and that were formed at remarkably low temperatures.
Such studies reveal the advantages of the probes that gather asteroid materials, such as the Hayabusa2 craft. In contrast to samples from meteorites, the rock and dust were not affected by weathering as they were situated in an area exposed to air, water, and soil.
Other than this, it is also quite tricky to study an asteroid in space, given how they reflect minimal light and move remarkably rapidly. This narrows the readings that instruments are capable of getting. However, in the lab, scientists can spend more time analyzing the specimens.
Cody mentions that previously, their research was narrowed by space rock samples that hit the surface of the earth. However, with the Hayabusa2, they were able to study an asteroid rich in carbon and examine its differences and similarities with the rocks that hit the earth.
RELATED ARTICLE: Oxygen Isotopic Signatures in Asteroid Ryugu Samples Reveal the Space Rock's Birth Place
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