Scientists attempt to re-create how life began (Thinkstock)
Scientists attempt to re-create how life began
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How did life on Earth begin?

Scientists in a lab used a powerful laser to re-create what might have been the original spark of life.

The researchers zapped clay and a chemical soup with the laser to simulate the energy of a speeding asteroid smashing into the planet. They ended up creating what can be considered crucial pieces of the building blocks of life.

The findings do not prove that this is how life started on Earth about 4 billion years ago, and some scientists were unimpressed with the results. But the experiment does bolster the long-held theory.

"These findings suggest that the emergence of terrestrial life is not the result of an accident but a direct consequence of the conditions on the primordial Earth and its surroundings," the researchers concluded. The study was published in the journal Proceedings of the National Academy of Sciences.

The laser-zapping produced all four chemical bases needed to make RNA. It's a simpler relative of DNA, the blueprint of life. From these bases, there are many still-mysterious steps that must happen for life to emerge. But this is a potential starting point in that process.

Scientists have been able to make these RNA bases other ways, using chemical mixes and pressure. But this is the first experiment to test the theory that the energy from a space crash could trigger the crucial chemical reaction. That's according to lead author Svatopluk Civis of the Heyrovsky Institute of Physical Chemistry in Prague.

Civis said the scientists used a laser almost 500 feet long. For a fraction of a second, it zapped the chemical soup with an invisible beam. The power was so intense and concentrated Civis said that, for less than a billionth of a second, it was equivalent to the output of a couple of nuclear power plants. It produced what would be around a billion kilowatts of energy for that sliver of time over a fraction of an inch. It generated heat of more than 7,600 degrees Fahrenheit, the researchers said.

Some of the earliest life on Earth seemed to coincide with a period called the Late Heavy Bombardment. That's when the solar system's asteroid belt was bigger and stray space rocks hit our planet more often, said study co-author David Nesvorny. He is a planetary scientist at the Southwest Research Institute in Colorado.

At the time, asteroids were bombarding Earth 10 times more frequently than before or after.

Outside experts were divided about the importance of the experiment.

Steve Benner is a biological chemist at the Foundation for Applied Molecular Evolution in Florida. He said it is quite relevant because it produced the starting material that would have been around in an early Earth.

But John Sutherland of the MRC Laboratory of Molecular Biology in Cambridge, England, disagreed. He said the amount produced of one base was so small that the results don't seem relevant. Other researchers also downplayed the work.

An alternative theory of early life on Earth says that microbes arrived here from space aboard a comet or an asteroid, a sort of seed theory of life. Civis' work bolsters what would instead be a fire theory of life. It is a theory of both creation and destruction.

Critical thinking challenge: How is this experiment different than others seeking the origins of life?

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COMMENTS (2)
  • MaxMicheletti
    12/29/2014 - 03:08 p.m.

    This article is about scientists trying to recreate what happened when life was created on Earth. They got a high powered laser and blasted some clay and a chemical soup. What they found reinforced the theory of life being created on Earth. An alternate theory is that a meteor came down with microbes in it, therefore introducing life on the Earth. This was a great advancement in science. That's really cool! I never knew you could recreate the Big Bang. This is a really cool experiment and I wish that I was a part of it.

  • Steve0620-yyca
    4/20/2016 - 08:57 p.m.

    The scientists did an experiment to see how life on Earth might have began. They used a strong laser and zapped some things. It created things that can be considered pieces of the building blocks of life. It made the four chemical bases that are needed for RNA. Many scientists believe this and others disagree about it.
    This experiment is different than others seeking the origins of life because the scientists used lasers and it created the four chemical bases of RNA.

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