Some Extremophiles Could Survive an Asteroid Impact on Mars, and the Dangerous Journey to Earth
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Panspermia is the idea that life was spread from world to world somehow. New research shows that one type of Earthly extremophile can survive the extremely high pressure from asteroid impacts on Mars, be blasted into space, and maybe even survive the journey to Earth.
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Some Extremophiles Could Survive an Asteroid Impact on Mars, and the Dangerous Journey to Earth By Evan Gough - March 03, 2026 08:41 PM UTC | Astrobiology One feature of the Solar System that doesn't require a complex explanation is the cratered surfaces of some of the planets and moons. These surfaces have been pummeled by impacts, and on some bodies, these impacts are defining features. The craters tell the tale of our Solar System's history. On Earth, at least one massive impact led to an extinction. But when it comes to life, these impacts may both give and take away. While the Chicxulub impact wiped out the dinosaurs, other impacts could potentially spread life from planet to planet. The idea that life can spread from world to world dates as far back as ancient Greece and the philosopher Anaxagoras. It's called panspermia , and while it's not exactly a mainstream scientific idea, it has endured. The idea has been bolstered somewhat by the growing understanding that life's chemical building blocks are more widespread than we thought. Now new research into extremophiles shows that at least some of them can survive ejection from Mars due to an asteroid strike. Not only can they survive the extreme high pressure from a direct impact, but they can survive the journey between planets, despite that journey's many hazards. This can happen if they become embedded in debris from the impact. The research is " Extremophile survives the transient pressures associated with impact-induced ejection from Mars, " and it's published in PNAS Nexus. The lead author is Lily Zhao, a graduate student in the Department of Mechanical Engineering at Johns Hopkins University. "Large-scale impacts are ubiquitous in the solar system, and the likelihood of survival of organisms after an impact event plays a key role in planetary protection, the search for extraterrestrial life, and the assessment of the panspermia hypothesis," the authors write. "Impacts generate very high stresses for short...
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