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.
Is your name now 'banned' in Saudi Arabia?
Missing Malaysia Airlines Flight MH370: Any terrorist seizure of the plane ‘would have required one hell of a piece of planning’
Friends in high places: Seth Rogen compiles list of all the celebrities he’s smoked pot with
Oscar Pistorius trial: Photographs of Paralympian splattered in blood after Reeva Steenkamp shooting shown in court
Missing Malaysia Airlines Flight MH370: New radar evidence suggests missing plane may have been hijacked
Katie Hopkins continues campaign to become Britain's most hated talking head with poorly timed Bob Crow tweet
No EU referendum under Labour: Ed Miliband to reveal that vote on membership is ‘unlikely’ in next Parliament if party wins power
Grace Dent: Who cares if she spells it Barraco Barner? Gemma Worrall is more employable than some bookish arts graduate
Europeans have ‘got whiter’ due to natural selection in past 5,000 years, scientists say
The rise of Ukip: Study warns Labour that Eurosceptic party's electoral base now 'more working class than any of the main parties'
Fracking is turning the US into a bigger oil producer than Saudi Arabia
- 1 Is your name now 'banned' in Saudi Arabia?
- 2 Best films on Netflix: 32 movies that will put an end to your scrolling
- 3 Istanbul protesters take 'Ellen selfie' from the back of a police van
- 4 Missing Malaysia Airlines Flight MH370: Jet ‘hijacking’ began soon after take-off
£50000 - £60000 per annum: Charter Selection: This well respected and exciting...
£40000 - £50000 per annum: Charter Selection: This exciting company and market...
£40000 - £60000 per annum + EXCELLENT SALARY: Austen Lloyd: Senior Private Cli...
£25,000 to £35,000: IT Connections Ltd: Signal Processing Engineer / Acoustics...