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Cosmic dust analogue seen through a microscope created by experiment by Linda Losurdo.
Creationist objections to abiogenesis often smuggle in the long-discredited idea of vitalism: the belief that living matter contains some special ingredient or “vital force” absent from non-living matter. This appears to lie behind the familiar creationist refrain that “life cannot come from non-life”, as though “life” were a substance that must be added to matter by a supernatural agent.
The word “life”, however, is rarely defined in this argument. Scientists can devise operational definitions for particular purposes, but life is not a single substance possessed by some molecules and absent from others. It is a collection of properties displayed by sufficiently organised chemical systems. By leaving the term undefined, creationists turn their assertion into a slogan that can neither be tested nor falsified.
The distinction between organic and inorganic chemistry is useful, but partly conventional and historical. Organic chemistry deals broadly with carbon compounds, although some carbon-containing substances—including carbon dioxide, carbon monoxide and carbonates—are traditionally classified as inorganic. There is no fundamental physical boundary between the two categories: both obey precisely the same laws of physics, chemistry and quantum mechanics.
Carbon’s extraordinary chemical versatility follows from its atomic structure. A carbon atom has six protons and six electrons, four of which are valence electrons in its outer shell. Its small size and ability to form strong covalent bonds with itself and with elements such as hydrogen, oxygen and nitrogen allow it to form stable chains, rings, branches and extensive molecular networks. Depending on how it is bonded, carbon can adopt tetrahedral, trigonal-planar or linear arrangements and can form single, double or triple bonds. All this follows from quantum chemistry; no vital spark, magical ingredient or special rule is required.
None of that proves that the origin of life was inevitable, and science does not yet possess a complete account of every stage of abiogenesis. What it does show is that there is no known chemical or physical barrier preventing non-living chemistry from becoming progressively more complex. Under suitable conditions, chemical systems can acquire such properties as compartmentalisation, catalysis and molecular replication. Once populations of replicating systems existed with heritable variation, natural selection could favour those that survived longer, reproduced more reliably and used available resources more efficiently.
One important question is where the organic raw materials involved in this prebiotic chemistry came from. Some could have formed on the early Earth, but organic compounds are also widespread throughout the Solar System and interstellar space. They have been detected in comets and asteroids and regularly occur in meteorites. Earth may therefore have received substantial quantities of organic material from several extraterrestrial sources. This raises another scientific question: what natural chemical and physical processes produced and modified that material in space?
Linda Losurdo, a PhD candidate in materials and plasma physics in the School of Physics at the University of Sydney, Australia, has investigated part of that question with her supervisor, Professor David McKenzie. They recreated some of the energetic, near-vacuum conditions associated with stars and other astrophysical environments inside glass tubes. After evacuating the tubes, they introduced nitrogen, carbon dioxide and acetylene and subjected the mixture to an electrical potential of about 10,000 volts for approximately an hour, producing a plasma known as a glow discharge.
































