In a bold move that sounds like it’s straight out of a sci-fi movie, scientists sent viruses into space. Yes, you heard that right. In September 2020, T7 bacteriophages and E. coli bacteria made their way to the International Space Station. They were incubated in sealed cryovials for 25 days under the microgravity conditions that make astronauts float.
Meanwhile, identical samples stayed grounded, doing their thing with gravity.
So, what happened up there? Well, infection by the T7 phage was delayed. That’s right, folks. Those viruses were taking their sweet time in the near-weightless environment. The dynamics of virus-bacteria interactions slowed down compared to Earth, and the lack of gravity meant fluids weren’t mixing properly. This created a unique selection environment that altered the evolutionary paths of both phages and bacteria. Talk about a cosmic experiment!
In space, T7 phages took their time, altering evolution in a cosmic experiment where gravity’s absence slowed infection dynamics.
The results? Space phages gained mutations that made them better at infecting bacteria. They were like “Hey, Earth, watch this!” These genetic changes didn’t happen in the Earth controls, proving that space has its own rules. Those mutations ramped up their ability to attach to and infect the E. coli cells. Notably, the research found that microgravity alters bacterial physiology, leading to unexpected evolutionary outcomes.
Meanwhile, the bacteria were no slouches either. They developed their own mutations to fend off these space invaders. They tweaked their receptors to resist infection—a classic case of survival of the fittest. This research is particularly significant as it highlights how virus-bacteria interactions in microgravity may lead to novel methods for combating antibiotic resistance.
The researchers, led by Phil Huss and Srivatsan Raman from the University of Wisconsin-Madison, published their findings in PLOS Biology in January 2026. Turns out, these space-evolved phages could potentially tackle antibiotic-resistant superbugs back on Earth.
Who knew a trip to space would reveal new insights for phage engineering? It’s a wild world out there—literally. Microgravity is revealing unexpected twists in this microbial saga, and it could change how we approach infections in the future.
