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Indian Air Force Group Captain and ISRO Gaganyatri Shubhanshu Shukla served as pilot of Axiom Mission 4 (Ax-4), completing seven Indian-led microgravity experiments aboard the International Space Station (ISS). The studies examined muscle-cell regeneration, algae, plants and seeds, tardigrades, cyanobacteria, and how people interact with electronic displays. ISRO reported that all seven experiments were completed by July 14, 2025—but completion is not the same as published scientific results.
Who is Shubhanshu Shukla?
Shubhanshu Shukla is an Indian Air Force Group Captain and an ISRO Gaganyatri selected for India’s human-spaceflight programme. On Ax-4, he was the mission’s pilot, not its commander. He became the first Indian to visit the ISS. That is distinct from Rakesh Sharma’s milestone: Sharma was the first Indian citizen in space, flying in 1984, before the ISS existed.
Ax-4 launched aboard a SpaceX Dragon spacecraft on June 25, 2025. The commercial astronaut mission was operated by Axiom Space in cooperation with NASA, SpaceX, ESA, ISRO, and other partners. Shukla and the crew returned to Earth on July 15 after about 18 days aboard the ISS. It was not a flight of India’s own crewed spacecraft; it was an international mission that gave Shukla and Indian institutions operational and research experience relevant to Gaganyaan. ISRO’s mission summary
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesWhat Shukla did—and who designed the research
ISRO’s Human Space Flight Centre coordinated seven Indian microgravity experiments. Indian principal investigators and institutions developed the research questions and protocols; Shukla served as the astronaut-operator, carrying out scheduled procedures, handling samples or equipment, recording observations, and following mission safety requirements. He was essential to performing the studies in orbit, but it would be inaccurate to say he personally designed all seven.
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On the ISS, “microgravity” is more precise than “zero gravity.” The environment changes how fluids move, how cells develop, how plants orient, and how organisms respond to reduced mechanical loading. Radiation and spacecraft conditions can also affect samples. Researchers use controls and later analysis to distinguish these influences; an observation in orbit does not automatically reveal which factor caused it.
The seven Indian experiments at a glance
| Experiment | Institutions named by ISRO | Research question | Potential relevance |
|---|---|---|---|
| Edible microalgae | International Centre for Genetic Engineering and Biotechnology (ICGEB); National Institute of Plant Genome Research (NIPGR) | How do edible microalgae respond to microgravity and the ISS radiation environment? | Nutrition and biological life-support research |
| Methi and moong seeds | University of Agricultural Sciences, Dharwad; IIT Dharwad | Can these seeds sprout in microgravity, and how do they grow? | Fresh food research for longer missions |
| Tardigrades | Indian Institute of Science (IISc), Bengaluru | How does the Indian strain survive, revive, reproduce, and change gene expression after exposure? | Research on biological stress responses |
| Myogenesis and muscle regeneration | Institute of Stem Cell Science and Regenerative Medicine (inStem), Bengaluru | How do muscle cells regenerate in microgravity, and what responses are associated with selected metabolic supplements? | Astronaut muscle-health and foundational cell research |
| Electronic-display interaction | IISc, Bengaluru | How does microgravity affect human interaction with displays and performance on software-based tasks? | Human factors and spacecraft interface design |
| Cyanobacteria | ICGEB | How do two varieties grow and alter protein-related activity with different nitrogen sources? | Research relevant to regenerative life-support systems |
| Food-crop seeds | Indian Institute of Space Science and Technology (IIST); College of Agriculture, Vellayani, Kerala Agricultural University | How does microgravity affect seed physiology and growth- and yield-related parameters? | Selection and study of crops for future space agriculture |
ISRO’s descriptions identify these as Indian experiments within a larger multinational Ax-4 research programme. The seven studies were not the whole of the mission’s science portfolio. ISRO’s list of Indian microgravity experiments
What each experiment investigated
1. Edible microalgae: testing a possible ingredient in space nutrition
Researchers from ICGEB and NIPGR studied edible microalgae in the space environment, including how microgravity and ISS radiation affect them. Algae are of interest because biological systems might one day contribute to astronaut nutrition or regenerative life support. This experiment examined their response; it did not demonstrate that algae can supply a complete diet or operate a self-sustaining life-support system.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match2. Methi and moong: seeing how familiar seeds sprout
Shukla helped initiate and observe the growth of methi (fenugreek) and moong (mung bean) seeds under microgravity. The University of Agricultural Sciences, Dharwad, and IIT Dharwad were involved. Freshly grown food could have nutritional and morale value on long missions, but germination is only an early step. Sprouting does not establish that a plant can complete its life cycle, produce a reliable harvest, or be grown efficiently in space.
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3. Tardigrades: probing survival and gene activity
IISc researchers studied the Indian tardigrade strain Paramacrobiotus sp. BLR. The work investigated survival, revival and reproduction after space exposure, alongside transcriptome analysis—the study of RNA transcripts that reflects gene-expression activity under particular conditions. The research may help scientists understand how organisms respond to severe stress, with possible relevance to radiation biology, cellular protection, and ageing research.
Tardigrades are unusually resilient model organisms, not proxies for human bodies. Their responses cannot show that people could survive comparable exposure or provide a ready-made human radiation countermeasure.
4. Myogenesis: studying muscle-cell regeneration
InStem, under the Department of Biotechnology, investigated how microgravity affects muscle-cell regeneration and whether selected metabolic supplements alter the cells’ response. Astronauts can lose muscle and physical capacity in microgravity, making cell-level studies useful to broader research into spaceflight health and muscle biology. But a cell experiment is not a clinical trial: it does not establish that a supplement prevents muscle loss in astronauts or treats patients on Earth.
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5. Electronic displays: a human-factors study, not a screen-time test
IISc’s study—identified by ISRO as the Voyoger Display experiment—used recurring software-based cognitive and interface assessments. It examined aspects of visual processing, interaction, and task performance in the space environment. Astronauts depend on screens for system monitoring, alerts, communications, navigation, and science work. A display that is easy to use on Earth may be harder to operate when a crew member is weightless, fatigued, stressed, or under time pressure. Findings could inform future cockpit, habitat, and station interfaces; the study should not be reduced to measuring screen time.
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6. Cyanobacteria: comparing growth and protein responses
ICGEB researchers compared two cyanobacterial varieties in microgravity, supplying them with urea or nitrate as nitrogen sources. They investigated growth and proteomics: changes in proteins and protein-related biological activity. Cyanobacteria interest space researchers because biological systems may help process carbon dioxide, produce oxygen or biomass, and support food-related processes. This was a research test, not a demonstration of an operational life-support unit.
7. Food-crop seeds: investigating growth and yield-related traits
IIST and the College of Agriculture at Vellayani, Kerala Agricultural University, studied how microgravity affects food-crop seed physiology and parameters related to growth and yield. The work adds agricultural research to India’s emerging space-science portfolio. Longer missions will require more than stored provisions, but seed responses, sprouting, plant growth, and harvest are different questions. The experiment did not establish that Indian crops can already be farmed successfully in space.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Completion is not the same as a scientific result
ISRO’s progress reports tracked the work during the mission: a July 3 update said the tardigrade experiment was complete while several others were under way; on July 11, four were complete and three were nearing completion. On July 14, ISRO reported that all seven had been completed as planned. ISRO’s completion announcement
That status confirms that the planned in-orbit experimental work was carried out. It does not, by itself, establish final biological findings, crop yields, therapeutic benefits, or a working life-support design. Samples and data were prepared or returned for further analysis. Scientific conclusions depend on analysis, comparison with controls, and publication; the official mission material cited here does not provide a consolidated, peer-reviewed result set for all seven experiments.
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Why the mission matters beyond the seven studies
Ax-4 offered India practical experience in crew training, international procedures, station operations, experiment execution, health monitoring, and coordination among space agencies and commercial partners. Those capabilities are relevant to Gaganyaan, but the distinction matters: Shukla flew on Dragon to the ISS, not on an Indian Gaganyaan spacecraft.
The experiment portfolio also connected universities, agricultural researchers, biotechnology institutes, and government space and science organisations. Developing protocols, preparing hardware, reviewing safety, handling samples, and coordinating research are part of building a microgravity ecosystem—not just supporting one astronaut’s flight. The agriculture and microbial studies raise questions for future research into food production and closed-loop life support; the cell and human-interface studies address crew health and the tools astronauts use. None should be mistaken for proof that those future systems or treatments are ready.
ISRO’s public updates establish the mission timeline and completion status. What remains to be learned is what the returned samples and recorded data show, which findings withstand analysis and review, and whether they lead to follow-up experiments. Until those results are reported, the clearest achievement is both operational and scientific: India completed a diverse set of planned investigations in orbit and gained experience that can support future human-spaceflight research.
Quick Recap
Timeline
- June 25, 2025: Ax-4 launched aboard SpaceX Dragon.
- July 3: ISRO reported the tardigrade study complete and several others in progress.
- July 11: ISRO reported four experiments complete and three nearing completion.
- July 14: ISRO reported completion of all seven Indian experiments.
- July 15: Shukla and the Ax-4 crew returned to Earth.
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