The probability space of a 140-nucleotide chain is 10^84. The estimated number of atoms in the universe is 10^80. The hypothesized RNA self-replicator is far simpler than the 238,000 base pair archaeal genome. But how are they formed? Even the most favorable prebiotic lab conditions have only produced short nucleotide chains. Direct chemical synthesis only recently achieved chains over 1700 nucleotides long [1].

1. https://www.chemistryworld.com/news/first-direct-chemical-sy...