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Others are exploring variations on the chemistry of life, seeking clues as to the possible diversity of life “out there” in the universe. Detecting signs of life on a planet orbiting a distant star is not going to be easy, but the technology for teasing out subtle “biosignatures” is developing so rapidly that with luck we may see distant life within one or two decades. ... Is the existence of life on Earth a lucky fluke or an inevitable consequence of the laws of nature? By Kat McGowan.
By turning higher category theory on itself, Riehl hopes to make the powerful perspective more accessible to other mathematicians. Read related article. In the 1950s the iconic Miller-Urey experiment, which zapped a mixture of water and simple chemicals with electric pulses (to simulate the impact of lightning), demonstrated that amino acids, the building blocks of proteins, are easy to make. Carlos Gershenson explains how principles of adaptation and self-organization can help transportation systems beat traffic jams and other urban mobility problems. Claudia de Rham explains why gravity is so fundamental to our understanding of everything in the universe. More than 3.6 billion years ago, a major transition was made on Earth whereby a dilute, swirling cauldron of simple chemical soup made a critical step towards creating the building blocks of life.
The evolutionary voyage from the first single cell (lovingly called LUCA, Last Universal Common Ancestor) to humankind is a baffling and complex process.
The age of the Earth is about 4.54 billion years; the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago. Remarkably, all the protein in all organisms is made by the catalytic activity of the RNA component of the ribosome, the cellular machine that reads genetic information and makes protein molecules. More than 3.6 billion years ago, a major transition was made on Earth whereby a dilute, swirling cauldron of simple chemical soup made a critical step towards creating the building blocks of life. Researchers are just beginning to identify the sources of chemical energy that could enable the RNA to copy itself, but much remains to be done.
Music by Kai Engel. David Kaplan explores the leading theories for the origin of life on our planet. Once a planet like our Earth—not too hot and not too cold, not too dry and not too wet—has formed, what chemistry must develop to yield the building blocks of life?
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Advances in fields as disparate as astronomy, planetary science and chemistry now hold promise that answers to such profound questions may be around the corner. These RNA strands then created the first short proteins, which manifested themselves into single cells. Copied! Occasionally biodiversity on Earth takes a hit in the form of a mass extinction in which the extinction rate is much higher than usual.
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