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Plants in Space: More Than Just Food
Beyond human biology, the ISS has also become a greenhouse in orbit. Astronauts have successfully grown lettuce, tomatoes, and other crops. "Some of the tomatoes were very well appreciated by the crew," Dr. Bhattacharya said.
Plant habitats on the ISS are not just functional; they are emotional anchors. "They're well-lit, so when crew members celebrate birthdays or holidays, they often gather near the plants. It's like the beautiful garden in space."
These experiments are crucial for future missions, where astronauts will need to grow their food. They also help scientists understand how plants respond to microgravity, which could lead to agricultural innovations back on Earth.
The Microbial Frontier
Space is also a frontier for microbiology. Dr Bhattacharya's team studied how bacteria behave in space and found that some, like Serratia marcescens, became more virulent after spaceflight.
"They killed fruit flies faster than bacteria that hadn't gone to space," she said.
Interestingly, this increased pathogenicity disappeared when the bacteria were grown again on Earth. "We wanted to understand the molecular biology behind that change and what made them more dangerous in space," she explained.
"These enclosed environments give us insights into microbial ecosystems, not just in space but also in places like submarines or hospitals on Earth," Dr Bhattacharya said.
Astronauts as Test Subjects
Over 600 astronauts have flown to space, many of them to the ISS. Their bodies have become invaluable data sources.
"We've grown multiple generations of fruit flies, Caenorhabditis elegans, and even plants in space," Dr. Bhattacharya said, adding that "Now we're doing longer and longer experiments."
One of the most exciting upcoming studies involves MRI scans of astronauts' brains before and after spaceflight, as part of the Axiom 4 mission.
"Given what we've seen in fruit flies, I'm very interested to see what the human data shows," she said.
The End of an Era, and the Start of Another
The ISS is expected to be retired by 2031. But Dr Bhattacharya is optimistic. "I celebrate what the ISS has given us," she said. "But I'm also looking forward to the next platform."
That next step could be a commercial space, perhaps Axiom, Haven, or VAST. China already has its space station, and India is planning one too.
"The more platforms we have in space, the more science we can do as a global community," she said.
Why It Matters for Earth
While the focus is often on preparing for Mars, the benefits of space biology are already being felt on Earth.
From understanding immune responses to developing better exercise regimens, the research done in orbit is improving healthcare on the ground.
"Basic biology helps us understand not just how to live in space, but how to live better on Earth," Dr Bhattacharya said.
A New Age of Exploration
As humanity looks beyond Earth, the ISS stands as a testament to what international cooperation and scientific curiosity can achieve.
It has been a proving ground for the biology of the future where humans may one day live on the Moon, Mars, or even beyond.
And thanks to scientists like Dr. Sharmila Bhattacharya, we're not just dreaming about that future, we're building it, one fruit fly at a time.
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