The Faint Young Sun Paradox!

To learn more about this topic, start your googling with these keywords: 

• Abiogenesis – the process of life arising from non-living matter, such as simple organic compounds.
• Amino Acids – a class of organic compounds. Twenty of the roughly 500 known amino acids appear in the genetic code, and, when strung together into long chains, form the basic building blocks of proteins.
• Faint Young Sun Paradox – describes the apparent contradiction between evidence for a warm ancient Earth, and stellar models, which predict that the young Sun was 25% dimmer than today's Sun. First described by Carl Sagan and George Mullen in 1972.
• The Miller–Urey experiment – a landmark experiment in the 1950s in which scientists demonstrated that amino acids could form spontaneously from inorganic gases present in Earth's early atmosphere
• Snowball Earth – a climatic state of Earth in which the entire surface becomes frozen over.

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