Emmett Chappelle, exobiologist, astrochemist and inventor of a method to detect living organisms. (Public Domain / NASA)
Emmett Chappelle was an African American researcher and biochemist known for his contributions to the field of space science through his invention of a method to detect life on other planets. Chappelle spent over three decades researching biochemistry and developed a technique for detecting life in extraterrestrial environments, which ultimately paved the way for NASA's astrobiology programs.
Early Life and Career of Emmett Chappelle
Chappelle was born on October 25, 1925, in Phoenix, Arizona. He completed his Bachelor of Science degree in 1948 and his Master's degree in 1950 from the University of California, Berkeley. Chappelle's early research work was in the field of photosynthesis, specifically studying how chlorophyll works in plants. He was also interested in the fields of biochemistry and microbiology.
In the 1960s, Chappelle joined NASA's Goddard Space Flight Center in Maryland, where he was part of a team that developed experiments to explore the possibility of finding life on other planets. During his time at NASA, Chappelle utilized his expertise in biochemistry to develop a technique to detect life on other planets.
The Invention of Life-Detection Technique
Chappelle's technique focused on detecting metabolic activity in microorganisms. He believed that since life on Earth, as we know it, depends on chemical reactions to maintain its metabolic activity, he could develop a similar method to detect similar activity on extraterrestrial environments.
Chappelle's approach relied on measuring the bioluminescence of microorganisms. Bioluminescence is the process where organisms produce light as a result of chemical reactions happening internally. Chappelle hypothesized that if bioluminescent bacteria were found on other planets and moons, they would be visible under UV light and would be the key indicator of life on other planets.
During his time at NASA, Chappelle made significant contributions to various space missions. His method for detecting life on other planets was part of the Viking landers' mission to Mars in 1976. The Viking mission involved an unmanned spacecraft landing on the red planet's surface and conducting biological experiments. Chappelle's life-detection technique was a part of the mission's biology package.
Later Career
Chappelle worked at NASA until his retirement in 2001. He received several honors for his contributions to biochemistry, including the National Medal of Technology and the Thomas Edison Patent Award for his bioluminescent detection methods.
Chappelle passed away on October 14, 2019, but his legacy lives on at NASA and in the scientific community. His technique for detecting life on other planets has opened the door to new discoveries and advancements in astrobiology, making it one of the most important contributions of any scientist or researcher in the field of space science.
Conclusion
Emmett Chappelle's invention of a method to detect life on other planets has had a significant impact on the field of astrobiology. His technique has led to many scientific discoveries and helped reshape our understanding of the possibility of life beyond Earth. The legacy of his work continues to inspire and advance the field of space science, and his contributions will be remembered for years to come.
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Reference:
1) https://www.nasa.gov/feature/emmett-chappelle-lights-up-nasa-s-path-to-astrobiology/
2) https://phys.org/news/2018-02-nasa-emmett-chappelle-bioluminescence.html
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