Mars 'has life's building blocks'

Greeley Haven on Mars, photographed by the Opportunity rover The researchers suggest Mars has "been undertaking organic chemistry for most of its history"

Related Stories

New evidence from meteorites suggests that the basic building blocks of life are present on Mars.

The study found that carbon present in 10 meteorites, spanning more than four billion years of Martian history, came from the planet and was not the result of contamination on Earth.

Details of the work have been published in the journal Science.

But the research also shows the Martian carbon did not come from life forms.

A team of scientists based at the Carnegie Institution for Science, based in Washington DC, found "reduced carbon" in the meteorites and says it was created by volcanic activity on Mars.

Scientists are looking for clues as to how chemistry evolved to create a "common ancestor" of all life on earth

Reduced carbon is carbon that is chemically bonded to hydrogen or itself.

They argue this is evidence "that Mars has been undertaking organic chemistry for most of its history."

The team's leader Dr Andrew Steele told BBC News: "For about the last 40 years we have been looking for a pool of what is called 'reduced carbon' on Mars, trying to find where it is, if it's there, asking "does it exist?"

"Without carbon, the building blocks of life cannot exist... So it is reduced carbon that, with hydrogen, with oxygen, with nitrogen make up the organic molecules of life."

He says the new analysis has answered the first question.

"This research shows, yes - it does exist on Mars and now we are moving to the next set of questions.

MSL The Mars Science Laboratory (Curiosity rover) will be next to land on Mars

"What happened to it, what was its fate, did it take the next step of creating life on Mars?"

He hopes the next mission to land on the Red Planet - the Mars Science Laboratory, also known as the "Curiosity" rover - will shed more light on the big question.

"The question 'are we alone' has been a big driver of science but it relates back to our own origins on this planet. If there is no life on Mars why? It allow us to make a more informed hypothesis about why life is here."

So does Dr Steele think there was, or is, life on Mars?

He laughs: "Get me some rocks back, I'll have a look and let you know."

More on This Story

Related Stories

More Science & Environment stories


Features & Analysis

BBC Future

A helicopter casts a shadow over the chasm in Guatemala (Getty Images)

When the Earth swallows people

What should we do to avoid sinkholes?


  • A robot holding a table legClick Watch

    The robots who build flat-pack furniture - teaching machines to work collaboratively

Try our new site and tell us what you think. Learn more
Take me there

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.