게시일: 2026 년 4 월 29 일 (화요일)
After years of lab work, the results are in: A rock that NASA’s Curiosity Mars rover drilled and analyzed in 2020 includes the most diverse collection of organic molecules ever found on the Red Planet. Of the 21 carbon-containing molecules identified in the sample, seven of them were detected for the first time on Mars.
Scientists have no way of knowing whether these organic molecules were created by biologic or geologic processes — either path is possible — but their discovery renewed confirmation that ancient Mars had the right chemistry to support life. What’s more, the molecules join a growing list of compounds known to be preserved in rocks even after billions of years of exposure on Mars to radiation, which can break down these molecules over time.
The findings are detailed in a new paper published Tuesday in Nature Communications. The rock sample, nicknamed “Mary Anning 3” after an English fossil collector and paleontologist, was collected on a part of Mount Sharp covered by lakes and streams billions of years ago. This oasis surged and dried up multiple times in the planet’s ancient past, eventually enriching the area with clay minerals, which are especially good at preserving organic compounds — carbon-containing molecules that are the building blocks of life and are found throughout the solar system.
Among the newly identified molecules is a nitrogen heterocycle, a ring of carbon atoms that includes nitrogen. This kind of molecular structure is considered a predecessor to RNA and DNA, two nucleic acids that are key to genetic information. “That detection is pretty profound because these structures can be chemical precursors to more complex nitrogen-bearing molecules,” said the paper’s lead author, Amy Williams of the University of Florida in Gainesville. “Nitrogen heterorcycles have never been found before on the Martian surface or confirmed in Martian meteorites.”
Another exciting discovery was benzothiophene, a carbon- and sulfur-bearing molecule that’s been found in many meteorites. These meteorites, along with the organic molecules within them, are thought by some scientists to have seeded prebiotic chemistry across the early solar system.
The new paper complements last year’s finding of the largest organic molecules ever discovered on Mars: long-chain hydrocarbons, including decane, undecane, and dodecane. “This is Curiosity and our team at their best. It took dozens of scientists and engineers to locate this site, drill the sample, and make these discoveries with our awesome robot,” said the mission’s project scientist, Ashwin Vasavada of NASA’s Jet Propulsion Laboratory in Southern California. “This collection of organic molecules once again increases the prospect that Mars offered a home for life in the ancient past.”
Both sets of findings were made with a sophisticated minilab called Sample Analysis at Mars (SAM), located in Curiosity’s belly. A drill on the end of the rover’s robotic arm pulverizes a carefully selected rock sample into powder and then trickles it into SAM, where a high-temperature oven heats the material, releasing gases that instruments in the lab analyze to reveal the rock’s composition.
📌 한국어 요약
NASA 의 화성 탐사선 큐리오시티가 2020 년에 채취한 암석 샘플에서 화성에서前所未有하게 가장 다양한 유기 분자를 발견했습니다. 21 개의 탄소 함유 분자 중 7 개는 화성에서 처음 확인된 것입니다. 과학자들은 이 분자가 생물학적 또는 지질학적 과정으로 생성되었는지 알 수 없지만, 고대 화성이 생명체를 지탱할 수 있는 화학 환경을 가지고 있었음을 다시 한번 확인시켜줍니다. 특히 RNA 와 DNA 의 전구체로 간주되는 질소 헤테로고리 화합물이 발견되어 주목을 받고 있습니다.
📚 핵심 단어
- Organic molecules: 유기 분자 – 탄소 를 포함한 생명체의 기본 구성 요소
- Nitrogen heterocycle: 질소 헤테로고리 – 탄소 고리에 질소가 포함된 분자 구조
- Benzothiophene: 벤조티오펜 – 탄소 와 황을 함유한 화합물
- Prebiotic chemistry: 생전 화학 – 생명이 탄생하기 전의 화학 과정
- Carbon-containing: 탄소 함유 – 탄소를 포함하는
- Geologic processes: 지질학적 과정 – 지질 활동에 의한 변화
- Nucleic acids: 핵산 – DNA 와 RNA 와 같은 유전 정보 분자
- Meteorites: 운석 – 우주에서 지구나 다른 행성으로 떨어진 암석