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Did life on Earth come from a comet?

New research suggests that  the collision of icy comets with our planet billions of years ago may have produced a 'cosmic factory' for early life on Earth.

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The Deep Impact spacecraft, which was sent to study the composition of comets in 2005, collides with comet Tempel 1 in this artist illustration. New research from the U.K. suggests that life on Earth could have started with an icy comet collision.

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An icy comet collision billions of years ago might have spurred life on Earth, a new British study suggests. 

Researchers found that amino acids – the building blocks of life – can be produced when an icy comet collides with a planet. The shock wave from the collision produces molecules that transform into amino acids under the heat of impact, the study finds.

Imperial College London scientist Zita Martins, a co-author of the paper, said in a news release that the research shows that amino acids can form anywhere in the solar system.

"Excitingly, our study widens the scope for where these important ingredients may be formed in the Solar System and adds another piece to the puzzle of how life on our planet took root," Dr. Martins said.

The team recreated a collision by firing steel projectiles out of a gun at more than 15,000 miles per hour into ice mixtures that mimicked the composition of comets. 

The discovery is the latest evidence that supports the theory that basic ingredients for life on Earth came from space. 

Scientists speculate that some 3.8 billion years ago, Earth was showered with asteroids and comets during what is known as the Late Heavy Bombardment (LHB) period. Some theories suggest that life began at the end of the LHB. 

In 2005, NASA's "Deep Impact" mission launched a spacecraft to crash into a comet named Tempel 1, with the goal of discovering the composition of comets. Scientists found organic chemicals under the surface of Tempel 1's core, a discovery suggesting that comets might have delivered the necessary ingredients for early life on Earth. 

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