Lyla Lindsey
A meteorite that landed in Australia in 1969 contained the oldest material ever found on Earth. The meteorite, which fell in the town of Murchison in Victoria, contained stardust that predated the formation of our solar system by billions of years. In addition to this, scientists from Japan and NASA have recently discovered the presence of a prebiotic organic molecule called hexamethylenetetramine (HMT) in three different carbon-rich meteorites, including the Murchison meteorite. This discovery validates models and theories that propose HMT as an important molecule in the formation of organic compounds in interstellar environments.
| Characteristics | Values |
|---|---|
| Date of meteorite crash | 28 September 1969 |
| Location | Murchison, near Shepparton, Victoria, Australia |
| Type of meteorite | Stones, carbonaceous chondrites |
| Composition | Silicate minerals olivine and pyroxene with feldspar and scattered nickel-iron |
| Molecule found | Hexamethylenetetramine (HMT) |
| Molecule characteristics | Prebiotic organic molecule, volatile |
| Molecule function | Building block for other organic molecules, including some used by life |
| Molecule discovery method | Crushing fragments of the rock and then segregating the component parts |
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What You'll Learn
- The meteorite contained the oldest material ever found on Earth
- The material was stardust that predated the formation of our solar system
- The meteorite fell in rural southeastern Australia in 1969
- The meteorite was the Murchison meteorite
- The meteorite contained a prebiotic organic molecule called hexamethylenetetramine (HMT)
The meteorite contained the oldest material ever found on Earth
A meteorite that fell in Australia in 1969 contained the oldest material ever found on Earth. The meteorite, which crashed into southeastern Australia in a fireball, contained stardust that predated the formation of our solar system by billions of years. The dust grains, trapped inside the meteorite fragments, were found around the town of Murchison in Victoria state. The oldest of these grains dated from about 7 billion years ago, 2.5 billion years before the formation of the sun, Earth, and the rest of our solar system.
This discovery highlights the significance of meteorites in understanding the origins and composition of our solar system. They provide valuable insights into the early stages of our planet's formation and evolution. The Murchison meteorite, in particular, has been of exceptional scientific interest due to its high organic content and amino acid-like chemicals.
Stardust, formed from the material ejected by stars, was incorporated into the formation of our solar system. However, it has survived intact only in asteroids and comets. The detection of stardust within the meteorite was achieved by crushing rock fragments and segregating the components, resulting in a paste with an unusual odour resembling rotten peanut butter.
Additionally, recent research has identified the presence of a prebiotic organic molecule called hexamethylenetetramine (HMT) in meteorites. This discovery supports the hypothesis that HMT is a stable source of ammonia and formaldehyde, which are essential for the formation of other organic molecules, including those used by living organisms. The identification of HMT in meteorites enhances our understanding of the chemical evolution of space and the potential sources of organic compounds that led to the emergence of life on Earth.
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The material was stardust that predated the formation of our solar system
In 1969, a meteorite crashed into southeastern Australia, creating a fireball. This meteorite contained the oldest material ever found on Earth. The material was stardust that predated the formation of our solar system by billions of years. The stardust was made up of 40 tiny dust grains, the oldest of which dated back about 7 billion years, approximately 2.5 billion years before the formation of the sun, Earth, and the rest of our solar system. These grains, measuring 2 to 30 micrometers, were composed of presolar silicon carbide.
Stardust forms from the material ejected by stars and carried by stellar winds into interstellar space. During the formation of our solar system, this stardust was incorporated into the bodies that formed, including the planets and the sun. However, it has only survived intact in asteroids and comets. The discovery of this ancient stardust in the Australian meteorite provides valuable insights into the early history of our galaxy, allowing scientists to study the composition and origins of our solar system.
The Australian meteorite, known as the Murchison meteorite, has been the subject of research for almost 20 years. It is of particular interest due to its high organic content and amino acid-like chemicals. The detection of these organic molecules in meteorites supports theories about the formation of organic compounds in extraterrestrial environments. This discovery was made by an international team of researchers led by Associate Professor Yasuhiro Oba from Hokkaido University, Japan.
The Murchison meteorite is not the only one to have been studied for its organic content. Another study, supported by NASA, examined a fragment of the meteorite stored in the Chicago Field Museum. This fragment was found to contain a prebiotic organic molecule called hexamethylenetetramine (HMT), which is believed to be a stable source of ammonia and formaldehyde in asteroids. These molecules are essential building blocks for the formation of other organic molecules, including those used by living organisms. The presence of these molecules in meteorites provides valuable insights into the emergence of life on Earth and the role of meteorites in this process.
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The meteorite fell in rural southeastern Australia in 1969
On September 28, 1969, a meteorite fell in Murchison, near Shepparton, Victoria, in rural southeastern Australia. The meteorite fell in a fireball and contained the oldest material ever found on Earth, dating to around 7 billion years ago, or about 2.5 billion years before the formation of the sun, the Earth, and the rest of our solar system. The material was in the form of stardust, which is formed from the material ejected from stars and carried by stellar winds, getting blown into interstellar space.
The Murchison meteorite is a carbonaceous chondrite, a type of stone meteorite that is of particular scientific interest due to its strange bituminous smell, high organic content, and amino acid-like chemicals. In 2023, scientists from Japan and NASA discovered the presence of a prebiotic organic molecule called hexamethylenetetramine (HMT) in the meteorite. HMT is believed to be a stable source for ammonia and formaldehyde in asteroids, which are necessary for the formation of other organic molecules, including some used by life. This discovery provides evidence for the theory that organic compounds can be formed in extraterrestrial environments and may have been a source of the organic compounds that led to the emergence of life on Earth.
The Murchison meteorite is not the only one to have fallen in Australia. Meteorites that have fallen and been found are called 'falls', while those found accidentally long after their arrival are called 'finds'. Another famous 'fall' occurred in Western Australia, where a 0.5-tonne stone meteorite was discovered in Wildara. Additionally, a 3.5-billion-year-old crater formed by a meteorite impact was discovered in Western Australia's Pilbara region, believed to be the oldest impact crater in the world. A second crater, estimated to be 2.2 billion years old, was also found in Western Australia, southwest of Pilbara, in Yarrabubba. These discoveries provide valuable insights into the history of the Earth and the evolution of the planet's environment.
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The meteorite was the Murchison meteorite
In 2020, NASA announced that hexamethylenetetramine was found in the Murchison meteorite. Measured purine and pyrimidine compounds were also found in the meteorite. The carbon isotope ratios for uracil and xanthine indicate a non-terrestrial origin for these compounds. This finding demonstrates that many organic compounds could have been delivered by early Solar System bodies and may have played a key role in the origin of life.
The Murchison meteorite has been found to contain a mixture of left-handed and right-handed amino acids. Most amino acids used by living organisms are left-handed in chirality, and most sugars used are right-handed. This homochirality could have been triggered or catalyzed by the action of a left-handed amino acid such as proline. A 2010 study identified 14,000 molecular compounds, including 70 amino acids, in a sample of the meteorite. The limited scope of the analysis by mass spectrometry provides for a potential 50,000 or more unique molecular compositions, with the team estimating the possibility of millions of distinct organic compounds in the meteorite.
The Murchison meteorite is also known for its high organic content and amino acid-like chemicals. It has been studied for its amino acids and other possible precursors to life, as some theories hold that life on Earth began with the delivery of prebiotic organic compounds from space via asteroids or comets. The meteorite's chemical complexity has been described as "a multitude of signals as we never saw in any other sample before" by analytical chemist Philippe Schmitt-Kopplin.
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The meteorite contained a prebiotic organic molecule called hexamethylenetetramine (HMT)
A meteorite that crashed into southeastern Australia in 1969 contained the oldest material ever found on Earth. The meteorite, which fell in the town of Murchison in Victoria state, contained stardust that predated the formation of our solar system by billions of years.
The meteorite that hit Australia contained a prebiotic organic molecule called hexamethylenetetramine (HMT). This molecule is key to understanding the formation of organic compounds in interstellar environments. HMT is stable and does not vaporize even at room temperature, making it a reliable source of ammonia and formaldehyde in asteroids. When asteroids are warm enough and contain liquid water, HMT can break down to provide building blocks for other important biological molecules, including amino acids.
The discovery of HMT in the Murchison meteorite was made by an international team of researchers led by Associate Professor Yasuhiro Oba from Hokkaido University, Japan. The fragment of the meteorite used in the study was from the Chicago Field Museum and had been stored inside a sealed container, making it the least contaminated and most pristine piece of Murchison studied for amino acids. This gave the researchers confidence that the HMT detected was indeed extraterrestrial in origin.
The presence of HMT in meteorites supports the theory that organic compounds can be formed in extraterrestrial environments. Organic molecules, which are essential for life, contain carbon and hydrogen and may also include oxygen, nitrogen, and other elements. While they can be created by non-biological processes, their presence is not necessarily an indicator of life. However, the discovery of HMT in meteorites provides insight into the potential sources of organic compounds that led to the emergence of life on Earth.
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Frequently asked questions
Hexamethylenetetramine (HMT), a prebiotic organic molecule, was found in the Murchison meteorite that fell in Australia in 1969.
The Murchison meteorite is famous for containing the oldest material ever found on Earth. It fell in Victoria, Australia, in 1969 and contained stardust that predated the formation of our solar system by billions of years.
Stardust forms from the material ejected from stars and carried by stellar winds, eventually getting blown into interstellar space. During the formation of our solar system, this stardust was incorporated into everything that formed, including the planets and the sun.
The discovery of HMT in meteorites validates theories that propose HMT as a crucial molecule in the formation of organic compounds in interstellar environments. HMT is stable and can produce ammonia and formaldehyde, which are necessary for the formation of other biological molecules like amino acids and sugars.
