The primordial soup theory, or the prebiotic broth theory was initially suggested by Russian biologist Aleksandr Oparin in 1924, and English geneticist J.B.S Haldane, in 1929 as an explanation for the origin of life on Earth. The theory involves an atmosphere of chemicals reacting to an application of external energy to create amino acids, which are the building blocks or proteins which create life. The genetic code found within DNA is responsible for creating proteins, and over billions of years they’ve evolved from simple structures to incredibly complicated life forms we are surrounded with today.
“The primordial soup is a generic term that describes the aqueous solution of organic compounds that accumulated in primitive water bodies of the early Earth as a result of endogenous abiotic syntheses and the extraterrestrial delivery by cometary and meteoritic collisions, and from which some have assumed that the first living systems evolved.” – Source
“Researchers have produced data supporting the idea that 10 amino acids believed to exist on Earth around 4 billion years ago were capable of forming foldable proteins in a high-salt (halophile) environment. Such proteins would have been capable of providing metabolic activity for the first living organisms to emerge on the planet between 3.5 and 3.9 billion years ago.” – Source
The experiment created by Miller-Urey was found to have contained possibly double the amino acids needed for life. Theists argue against the idea of life coming from non-life as they rarely understand evolution as they can’t comprehend the length of time it took to move from microorganisms to complex organism that have billions of cells in their make up.
Another hypothesis that some scientists claim is more feasible is the panspermia theory, which is the idea that the universe is full of life, and at the time of Earth’s early years the solar system was littered with meteors and comets and that they were carrying microorganisms (extremophiles) that are able to survive the harshest conditions hit the Earth and created life. Extremophiles are considered the most abundant life forms on Earth and are found in the harshest climates like Antarctica which is obviously extremely cold temperatures and high UV radiation. Astrobiologists claim that the conditions of Antarctica are comparable to the surface of Mars, and if there’s life below the ice of Antarctica, then life can also exist below the surface of Mars.