The Space Show Presents Dr. Tiffany Hennessa, Friday, 8-14-26.
Meeting Summary
This Space Show live broadcast interviewed Dr. Tiffany Hennessa, a research biologist at the Naval Research Lab (NRL) who studies microbial research for space applications. Dr. Hennessy discussed her work using microbes and fungi like Aspergillus in space experiments, including missions to the ISS and Artemis I to the moon, where she studies how microgravity affects microbial growth, nutrient uptake, and the production of specialized compounds. We talked about technical challenges of conducting experiments in space, including hardware limitations, sample size restrictions, and the need for simplicity in design to accommodate astronauts’ time constraints. Dr. Hennessa explained that space biology research is highly competitive and difficult to fund, with costs being a significant factor in project planning. The discussion also touched on potential applications for defense and biomanufacturing, as well as future opportunities with commercial space stations and robotic laboratories.
Detailed Summary
Tiffany discussed her journey from plant science PhD at the University of Maryland to her current work at NRL on space biology research. She explained how she was initially tasked with working on the Artemis I program, ISS experiments, and Antarctic balloon experiments. When asked about the types of microbes used in space research, Tiffany clarified that “microbes” was a blanket term for microorganisms like yeast, fungi, and bacteria, and explained that the choice of organism depends on the research question and factors like feasibility, safety, and hardware compatibility with space environments.
Tiffany explained a space mission where her team sent Aspergillus niger spores to the moon on Artemis I, packed in gelatin capsules with phase-changing media to allow germination during the two-week journey. The experiment was designed to be passive, with the fungi growing in microgravity while experiencing gamma radiation, though no cameras were included to capture the process in real time. David asked about the medical implications of Aspergillus niger, to which Tiffany confirmed it can cause health issues for immunocompromised individuals, though it is generally tolerable for healthy people.
Tiffany discussed the potential for finding fungi on other planets, noting their 50% genomic homology with humans and their resilience to extreme conditions, including high temperatures and radiation. She explained how microgravity affects fluid behavior and nutrient transport in cells, leading to altered growth rates and phenotypes. When asked by John Jossy about the potential benefits of artificial gravity, Tiffany suggested it could help mitigate these issues but also highlighted how microgravity forces organisms to adapt and produce specialized compounds.
Marshall discussed the potential use of amino acid chirality as a methodology to determine whether organisms are space-sourced or Earth-sourced, noting how radiation exposure could cause mutations in amino acids. Tiffany explained that while the International Space Station (ISS) is shielded from most radiation, UV radiation could potentially introduce mutations in organisms like fungi and algae. When asked about conducting research in space labs, Tiffany expressed interest in the potential benefits, particularly for fresh sample processing, though she noted personal challenges with space travel due to motion sickness.
Tiffany discussed the challenges of space biology research, explaining that while Aspergillus niger is a reliable organism for their experiments, she hadn’t considered exploring other organisms due to comfort with the current setup. She described their work on engineering microbes to produce specialized chemicals and biomaterials for potential biomanufacturing in space, which could strengthen domestic supply chains. Tiffany noted that space biology research faces significant competition for funding, making it challenging to secure resources for these types of projects.
Our guest discussed her work in space biology, explaining that while her research doesn’t currently focus on human biology during pregnancy or space settlement, she is interested in producing novel chemicals and compounds that could potentially be used for medicine. She described her day-to-day activities as primarily involving engineering yeast to produce chemicals of interest and conducting strain characterization, with some omics-based research being handled by others. When asked about responding to criticisms of space spending, Tiffany indicated she hasn’t encountered negative views but would emphasize the unique opportunity to work with astronauts and send samples to space. She also explained that her research only involves non-toxic BSL Level 1 organisms due to safety constraints.
David and Tiffany discussed the purpose of studying organisms in space to understand their responses and potential adaptations that could benefit human health in Earth’s environment. Tiffany explained that certain compounds produced in microgravity could lead to beneficial mutations and adaptations that could protect astronauts and future warfighters. When asked about launch costs, Tiffany indicated she was not privy to specific cost details, though she acknowledged that space missions are expensive and costs vary based on payload size and complexity. Tiffany also shared her experience attending launches at Kennedy Space Center, including the Artemis and Starlink missions, though she noted that schedule delays required multiple visits.
Tiffany further explained that simplicity is crucial when designing space experiments due to hardware limitations and astronauts’ tight schedules. She noted that while simple experiments can be successful, complexity constraints limit what can be accomplished in current space labs. Tiffany expressed optimism that robotic labs in future commercial stations could enable more complex experiments, allowing researchers to monitor and control them remotely.
In summary, Dr. Hennessa discussed her work on microbial research in space, including the use of robotic systems to handle samples and the importance of considering sample size and space limitations. She expressed interest in testing samples at different gravity levels and explained her team’s role in the project. The discussion also touched on concerns about potential mutations in space and the feasibility of bringing samples back to Earth. David and the team discussed upcoming Space Show programs and topics, including a show on quantum computing and internet stability. The conversation ended with a brief conversation about Manuel’s research on osteoarthritis in microgravity.
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