Asteroid which wiped out dinosaurs 'could have sent life to Mars'
US research shows there is a ‘better than 50/50’ chance that life was seeded between bodies in the Solar System
Asteroids like the one that wiped out the dinosaurs on Earth could have shot life to Mars or the moons of Jupiter and Saturn, US scientists have said.
Researchers calculated the number of potentially life-bearing rocks that have been ejected from our planet to other bodies in the Solar System, and found the chances were “better than 50/50” that life could have made the journey.
Writing in the journal Astrobiology, the team from Penn State University said they found that there was “frequent transfer of material among the terrestrial planets” over the course of the last 3.5 billion years.
Speaking to BBC News, lead study author Rachel Worth said: “I'd be surprised if life hasn't gotten to Mars.”
Ms Worth said a small but significant number of simulated meteorite journeys made it all the way out to Europa, Jupiter’s icy moon which could have vast oceans of water hidden beneath the surface.
“Even using conservative, realistic estimates... it's still possible that organisms could be swimming around out there in the oceans of Europa,” she said.
As an example of the sort of meteorite likely to have caused rocks to catapulted from the Earth’s surface, the scientists analysed the famous impact at Chicxulub in Mexico 66 million years ago.
Then, an asteroid the size of a small city sent tremors around the world, throwing up a cloud of smoke and ash which scientists blame for wiping out the dinosaurs. That impact threw 70 billion kg of rock into space – and Ms Worth told the BBC that such large events led to “ejected debris easily finding its way from one planet to another”.
The researchers said it was beyond the scope of their study to establish whether life could have prospered on arrival – but suggested that it was entirely possible in the earlier period when Mars and Jupiter’s moons were much warmer.
Ms Worth added that what goes one way could have gone in the reverse. “It is even possible that life on Earth originated on Mars,” she said.
- 1 Apple has installed security backdoors on 600m iPhones and iPads, claims security researcher
- 2 UK pirates will get four warning letters a year
- 3 Fight Club 2: Chuck Palahniuk sequel is a 'meta-fictional comment on the cultural response to the original'
- 4 Is Gideon Levy the most hated man in Israel or just the most heroic?
- 5 Israel-Gaza conflict: Deadly flechette shells 'used by Israeli military in Gaza Strip’
Malaysia Airlines flight MH17 crash: 'Nine Britons, 23 Americans and 80 children' feared dead after Boeing passenger jet is 'shot down' near Ukraine-Russia border
Malaysia Airlines MH17 crash: Vladimir Putin is given 'one last chance' to end hostilities in Ukraine
The 'scroungers’ fight back: The welfare claimants battling to alter stereotypes
The truth about conspiracy theories is that some require considering
Malaysia Airlines MH17 crash: Ukrainian military jet was flying close to passenger plane before it was shot down, says Russian officer
Malaysia Airlines MH17 crash: victims’ bodies bundled in black bags and loaded onto trains
Competitive: The Green Recruitment Company: Job Title: Scheme Manager (BREEAM)...
Flexible, depending on experience: The Green Recruitment Company: Job Title: T...
£850 - £950 per day: Orgtel: Programme Director - Conduct Risk - Banking - £85...
£100 - £110 per day: Orgtel: Project Coordinator/Order Entry Hampshire