'Molecular time travelers' are one piece of the puzzle to understand whether there's life beyond Earth.
What if we thought of our ancestors as a form of alien life?
Today's life, he says, is cellular and based on DNA, but neither cells nor DNA were present in the earliest forms of life on Earth. By association,"these were things that had to evolve in early evolutionary history," he said."So understanding how and why these characteristics of life evolved on early Earth can inform whether or not we would expect the same things to be present in extraterrestrial organisms.
Adrienne Kish, a microbiologist with the National Museum of Natural History in Paris, said we also need to remember how commonly life can arise in places on Earth that are utterly inhospitable for humans. An example is hydrothermal vents deep in the ocean.
France Dernières Nouvelles, France Actualités
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Physicists predict Earth will become a chaotic world, with dire consequencesPaul M. Sutter is a research professor in astrophysics at SUNY Stony Brook University and the Flatiron Institute in New York City. He regularly appears on TV and podcasts, including 'Ask a Spaceman.' He is the author of two books, 'Your Place in the Universe' and 'How to Die in Space,' and is a regular contributor to Space.com, Live Science, and more. Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three years at the Paris Institute of Astrophysics, followed by a research fellowship in Trieste, Italy.
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