Hydrothermal vents, where the planet's heat seeps out into the deep ocean through cracks in Earth's crust, are candidates for where life may have began. So, scientists are eager to bring the vents into the lab.
That's precisely what a team of scientists did in a suite of experiments described in a recent paper. The research aims to better understand how the building blocks of life may or may not have formed in these systems. And the paper may also have implications for the study of extraterrestrial life, since scientists think that any similar vent structures hidden on icy worlds are strong candidates for finding life if it exists elsewhere.
"We don't have concrete evidence of life elsewhere yet," Laurie Barge, an astrobiologist at the NASA Jet Propulsion Laboratory in California and lead author on the new study, said in a statement from NASA. "But understanding the conditions that are required for life's origin can help narrow down the places that we think life could exist."
So, Barge and her colleagues ran a series of experiments designed to investigate the precise conditions under which amino acids, the building blocks of proteins, could form in these systems. To do so, the researchers created miniature hydrothermal-vent structures trapped in lab flasks in order to see how reactions proceeded in a more realistic environment than previous experiments without such features.
"Understanding how far you can go with just organics and minerals before you have an actual cell is really important for understanding what types of environments life could emerge from," Barge said. "Also, investigating how things like the atmosphere, the ocean and the minerals in the vents all impact this can help you understand how likely this is to have occurred on another planet."
Scientists are particularly intrigued by the possibility that such hydrothermal vent environments exist on the ocean floors of ice-crusted moons in the outer solar system. Such sites include Saturn's moon Enceladus and Jupiter's moon Europa.
The new research is described in a paper published yesterday (Feb. 25) in the journal Proceedings of the National Academy of Sciences.
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